diff --git a/README.md b/README.md
index 817ee1e..62bd7ce 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,37 @@ LAYA_BASE_URL=http://localhost:8000 npm start
 
 Repository maintainers can build and publish both the nodecast-tv and Laya images with `./scripts/docker-build-push.sh`; this script is not needed by Compose users. `REGISTRY`, `OWNER`, `IMAGE_NAME`, `LAYA_IMAGE_NAME`, and `TAG` can override the publication targets. Use `--no-push` to build both images locally without publishing them.
 
+#### Server-side Google Cast
+
+Nodecast can discover and control Chromecast and compatible Android TV devices from the server. This makes casting available from any browser: the browser asks Nodecast to start playback, while the Nodecast server performs LAN discovery and communicates with the receiver.
+
+Configure both of these variables:
+
+- `CAST_PUBLIC_BASE_URL`: the absolute Nodecast URL that the receiver can reach on the LAN. It must not use `localhost`, `127.0.0.1`, or `::1`.
+- `CAST_SIGNING_SECRET`: a dedicated secret of at least 32 bytes, used for temporary cookie-free media URLs. Do not reuse a public value or commit the secret.
+
+For example, add the following entries to the `nodecast-tv` service in `docker-compose.yml`, replacing the address and secret:
+
+```yaml
+services:
+  nodecast-tv:
+    environment:
+      - CAST_PUBLIC_BASE_URL=http://192.168.1.50:3000
+      - CAST_SIGNING_SECRET=${CAST_SIGNING_SECRET}
+```
+
+Then define the secret in the deployment `.env` file. A suitable value can be generated with `openssl rand -hex 32`:
+
+```env
+CAST_SIGNING_SECRET=replace-with-a-random-secret-of-at-least-32-bytes
+```
+
+Restart Nodecast, open a Live or Watch player in any browser, select the Cast control, and refresh the device list if necessary. Nodecast discovers Google Cast receivers over mDNS from its own network environment; the browser itself does not need native Chromecast support.
+
+Docker bridge networks may not pass multicast DNS traffic from the LAN. Depending on the host platform, discovery may require host networking or an explicitly configured Docker/LAN network. The receiver must also be able to open `CAST_PUBLIC_BASE_URL` and its media URLs.
+
+Fire TV / Fire Stick is not a native Google Cast target. Matter Casting or Fire TV playback requires a compatible receiver application that is outside the scope of this integration; unsupported devices are shown as **Receiver required** rather than being presented as castable.
+
 
 ### Hardware Acceleration Setup
 
@@ -279,6 +310,20 @@ docker compose --profile laya pull laya
 docker compose --profile laya up -d --force-recreate laya
 ```
 
+### Server-side Cast
+
+If no Chromecast or Android TV appears:
+
+- Confirm that Nodecast and the receiver are on reachable LAN segments and that multicast DNS (`_googlecast._tcp`) is not blocked by Wi-Fi isolation, a firewall, VLAN rules, or Docker networking.
+- When Nodecast runs in Docker, test a host-network or LAN-compatible container configuration if the default bridge cannot see mDNS advertisements.
+- Refresh the device list from the Cast dialog and inspect `docker compose logs nodecast-tv` for discovery errors.
+
+If a device is found but cannot start playback, open `CAST_PUBLIC_BASE_URL` from another device on the same network. The URL must contain the host's reachable LAN address or DNS name and the published port; a container name or `localhost` will not work from the receiver. Also check firewall access to that address.
+
+If Nodecast reports that Cast signing is unavailable, set a dedicated `CAST_SIGNING_SECRET` containing at least 32 bytes and recreate the container. Nodecast deliberately refuses to issue predictable unsigned or weakly signed media URLs.
+
+Fire TV, Fire Stick, and Matter Casting do not automatically provide Google Cast compatibility. Without a compatible receiver application, Nodecast reports **Receiver required**; use a Chromecast or Google Cast-enabled Android TV for this server-cast integration.
+
 ### Video Won't Play (Black Screen or Loading Forever)
 
 | Symptom | Likely Cause | Solution |
diff --git a/package-lock.json b/package-lock.json
index 7595c62..a0f16fe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,8 @@
                 "@ffprobe-installer/ffprobe": "^2.1.2",
                 "bcryptjs": "^3.0.3",
                 "better-sqlite3": "^12.5.0",
+                "bonjour-service": "^1.4.4",
+                "chromecast-client": "^1.0.1",
                 "dotenv": "^17.2.3",
                 "express": "^4.18.2",
                 "express-session": "^1.18.2",
@@ -178,6 +180,69 @@
                 "win32"
             ]
         },
+        "node_modules/@leichtgewicht/ip-codec": {
+            "version": "2.0.5",
+            "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.5.tgz",
+            "integrity": "sha512-Vo+PSpZG2/fmgmiNzYK9qWRh8h/CHrwD0mo1h1DzL4yzHNSfWYujGTYsWGreD000gcgmZ7K4Ys6Tx9TxtsKdDw==",
+            "license": "MIT"
+        },
+        "node_modules/@protobufjs/aspromise": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
+            "integrity": "sha512-j+gKExEuLmKwvz3OgROXtrJ2UG2x8Ch2YZUxahh+s1F2HZ+wAceUNLkvy6zKCPVRkU++ZWQrdxsUeQXmcg4uoQ==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/base64": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/base64/-/base64-1.1.2.tgz",
+            "integrity": "sha512-AZkcAA5vnN/v4PDqKyMR5lx7hZttPDgClv83E//FMNhR2TMcLUhfRUBHCmSl0oi9zMgDDqRUJkSxO3wm85+XLg==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/codegen": {
+            "version": "2.0.5",
+            "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.5.tgz",
+            "integrity": "sha512-zgXFLzW3Ap33e6d0Wlj4MGIm6Ce8O89n/apUaGNB/jx+hw+ruWEp7EwGUshdLKVRCxZW12fp9r40E1mQrf/34g==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/eventemitter": {
+            "version": "1.1.1",
+            "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.1.tgz",
+            "integrity": "sha512-vW1GmwMZNnL+gMRaovlh9yZX74kc+TTU3FObkkurpMaRtBfLP3ldjS9KQWlwZgraRE0+dheEEoAxdzcJQ8eXZg==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/fetch": {
+            "version": "1.1.1",
+            "resolved": "https://registry.npmjs.org/@protobufjs/fetch/-/fetch-1.1.1.tgz",
+            "integrity": "sha512-GpptLrs57adMSuHi3VNj0mAF8dwh36LMaYF6XyJ6JMWlVsc+t42tm1HSEDmOs3A8fC9yyeisgLhsTVQokOZ0zw==",
+            "license": "BSD-3-Clause",
+            "dependencies": {
+                "@protobufjs/aspromise": "^1.1.1"
+            }
+        },
+        "node_modules/@protobufjs/float": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
+            "integrity": "sha512-Ddb+kVXlXst9d+R9PfTIxh1EdNkgoRe5tOX6t01f1lYWOvJnSPDBlG241QLzcyPdoNTsblLUdujGSE4RzrTZGQ==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/path": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
+            "integrity": "sha512-6JOcJ5Tm08dOHAbdR3GrvP+yUUfkjG5ePsHYczMFLq3ZmMkAD98cDgcT2iA1lJ9NVwFd4tH/iSSoe44YWkltEA==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/pool": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
+            "integrity": "sha512-0kELaGSIDBKvcgS4zkjz1PeddatrjYcmMWOlAuAPwAeccUrPHdUqo/J6LiymHHEiJT5NrF1UVwxY14f+fy4WQw==",
+            "license": "BSD-3-Clause"
+        },
+        "node_modules/@protobufjs/utf8": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.2.tgz",
+            "integrity": "sha512-b1UQwcEZ4yCnMCD8DAL1VlbvBJE9/IX4FTIp7BG1xYpf29SLazLSrqUkj4w7Y5y7cCVP6E5tcqqcI0xemPkHug==",
+            "license": "BSD-3-Clause"
+        },
         "node_modules/@tootallnate/once": {
             "version": "2.0.1",
             "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.1.tgz",
@@ -354,6 +419,16 @@
                 "npm": "1.2.8000 || >= 1.4.16"
             }
         },
+        "node_modules/bonjour-service": {
+            "version": "1.4.4",
+            "resolved": "https://registry.npmjs.org/bonjour-service/-/bonjour-service-1.4.4.tgz",
+            "integrity": "sha512-jCZcVv7eoc4QesRscwEZtSROBen+6LpKAmBIsQYQrsAeVHLyMXWX/t6eIV5KiRZYNUBl8eVqImEEMQ8L5+c/Kw==",
+            "license": "MIT",
+            "dependencies": {
+                "fast-deep-equal": "^3.1.3",
+                "multicast-dns": "^7.2.5"
+            }
+        },
         "node_modules/buffer": {
             "version": "5.7.1",
             "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
@@ -436,12 +511,82 @@
             "license": "Apache-2.0",
             "optional": true
         },
+        "node_modules/castv2": {
+            "version": "0.1.10",
+            "resolved": "https://registry.npmjs.org/castv2/-/castv2-0.1.10.tgz",
+            "integrity": "sha512-3QWevHrjT22KdF08Y2a217IYCDQDP7vEJaY4n0lPBeC5UBYbMFMadDfVTsaQwq7wqsEgYUHElPGm3EO1ey+TNw==",
+            "license": "MIT",
+            "dependencies": {
+                "debug": "^4.1.1",
+                "protobufjs": "^6.8.8"
+            }
+        },
+        "node_modules/castv2/node_modules/debug": {
+            "version": "4.4.3",
+            "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+            "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+            "license": "MIT",
+            "dependencies": {
+                "ms": "^2.1.3"
+            },
+            "engines": {
+                "node": ">=6.0"
+            },
+            "peerDependenciesMeta": {
+                "supports-color": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/castv2/node_modules/ms": {
+            "version": "2.1.3",
+            "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+            "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+            "license": "MIT"
+        },
         "node_modules/chownr": {
             "version": "1.1.4",
             "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
             "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
             "license": "ISC"
         },
+        "node_modules/chromecast-client": {
+            "version": "1.0.1",
+            "resolved": "https://registry.npmjs.org/chromecast-client/-/chromecast-client-1.0.1.tgz",
+            "integrity": "sha512-79QTIu6g1oYHvI9i8sPc8kpwrZGb6hXiNnEJmoiFLfjTYTJO+kKc8ML1uqNNKZbKMMFsgR/89da0A3ezD5p92A==",
+            "license": "MIT",
+            "dependencies": {
+                "castv2": "^0.1.10",
+                "debug": "^4.3.4",
+                "zod": "^3.20.2"
+            },
+            "funding": {
+                "url": "https://www.patreon.com/dantaylor"
+            }
+        },
+        "node_modules/chromecast-client/node_modules/debug": {
+            "version": "4.4.3",
+            "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+            "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+            "license": "MIT",
+            "dependencies": {
+                "ms": "^2.1.3"
+            },
+            "engines": {
+                "node": ">=6.0"
+            },
+            "peerDependenciesMeta": {
+                "supports-color": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/chromecast-client/node_modules/ms": {
+            "version": "2.1.3",
+            "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+            "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+            "license": "MIT"
+        },
         "node_modules/combined-stream": {
             "version": "1.0.8",
             "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -613,6 +758,18 @@
                 "node": ">=8"
             }
         },
+        "node_modules/dns-packet": {
+            "version": "5.6.1",
+            "resolved": "https://registry.npmjs.org/dns-packet/-/dns-packet-5.6.1.tgz",
+            "integrity": "sha512-l4gcSouhcgIKRvyy99RNVOgxXiicE+2jZoNmaNmZ6JXiGajBOJAesk1OBlJuM5k2c+eudGdLxDqXuPCKIj6kpw==",
+            "license": "MIT",
+            "dependencies": {
+                "@leichtgewicht/ip-codec": "^2.0.1"
+            },
+            "engines": {
+                "node": ">=6"
+            }
+        },
         "node_modules/domexception": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/domexception/-/domexception-4.0.0.tgz",
@@ -844,6 +1001,12 @@
                 "node": ">= 0.8.0"
             }
         },
+        "node_modules/fast-deep-equal": {
+            "version": "3.1.3",
+            "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+            "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
+            "license": "MIT"
+        },
         "node_modules/ffmpeg-static": {
             "version": "5.3.0",
             "resolved": "https://registry.npmjs.org/ffmpeg-static/-/ffmpeg-static-5.3.0.tgz",
@@ -1346,6 +1509,12 @@
             "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg==",
             "license": "MIT"
         },
+        "node_modules/long": {
+            "version": "5.3.2",
+            "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
+            "integrity": "sha512-mNAgZ1GmyNhD7AuqnTG3/VQ26o760+ZYBPKjPvugO8+nLbYfX6TVpJPseBvopbdY+qpZ/lKUnmEc1LeZYS3QAA==",
+            "license": "Apache-2.0"
+        },
         "node_modules/math-intrinsics": {
             "version": "1.1.0",
             "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -1448,6 +1617,19 @@
             "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
             "license": "MIT"
         },
+        "node_modules/multicast-dns": {
+            "version": "7.2.5",
+            "resolved": "https://registry.npmjs.org/multicast-dns/-/multicast-dns-7.2.5.tgz",
+            "integrity": "sha512-2eznPJP8z2BFLX50tf0LuODrpINqP1RVIm/CObbTcBRITQgmC/TjcREF1NeTBzIcR5XO/ukWo+YHOjBbFwIupg==",
+            "license": "MIT",
+            "dependencies": {
+                "dns-packet": "^5.2.2",
+                "thunky": "^1.0.2"
+            },
+            "bin": {
+                "multicast-dns": "cli.js"
+            }
+        },
         "node_modules/napi-build-utils": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-2.0.0.tgz",
@@ -1669,6 +1851,38 @@
                 "node": ">=0.4.0"
             }
         },
+        "node_modules/protobufjs": {
+            "version": "7.6.6",
+            "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.6.6.tgz",
+            "integrity": "sha512-dYDWdjSl5RNb7SgPxGQcRU+GtvP7s2fpkrY0r432PcOIaZ0/rBcxEZnQN67iJhFuQiVw754JDoPruPCNdGsbjg==",
+            "hasInstallScript": true,
+            "license": "BSD-3-Clause",
+            "dependencies": {
+                "@protobufjs/aspromise": "^1.1.2",
+                "@protobufjs/base64": "^1.1.2",
+                "@protobufjs/codegen": "^2.0.5",
+                "@protobufjs/eventemitter": "^1.1.1",
+                "@protobufjs/fetch": "^1.1.1",
+                "@protobufjs/float": "^1.0.2",
+                "@protobufjs/path": "^1.1.2",
+                "@protobufjs/pool": "^1.1.0",
+                "@protobufjs/utf8": "^1.1.1",
+                "@types/node": ">=13.7.0",
+                "long": "^5.3.2"
+            },
+            "engines": {
+                "node": ">=12.0.0"
+            }
+        },
+        "node_modules/protobufjs/node_modules/@types/node": {
+            "version": "26.6.4",
+            "resolved": "https://registry.npmjs.org/@types/node/-/node-26.6.4.tgz",
+            "integrity": "sha512-ldVPDCzj7fsaGZrLB0NuHuTvJcsNasysBAqMolr/cgxrLd1xbqxIr3XJiPnHHJUCxj5sNF1vnRj9aWnrVh5Jcg==",
+            "license": "MIT",
+            "dependencies": {
+                "undici-types": "~8.9.0"
+            }
+        },
         "node_modules/proxy-addr": {
             "version": "2.0.7",
             "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -2100,6 +2314,12 @@
                 "node": ">=6"
             }
         },
+        "node_modules/thunky": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/thunky/-/thunky-1.1.0.tgz",
+            "integrity": "sha512-eHY7nBftgThBqOyHGVN+l8gF0BucP09fMo0oO/Lb0w1OF80dJv+lDVpXG60WMQvkcxAkNybKsrEIE3ZtKGmPrA==",
+            "license": "MIT"
+        },
         "node_modules/toidentifier": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
@@ -2182,6 +2402,12 @@
                 "node": ">= 0.8"
             }
         },
+        "node_modules/undici-types": {
+            "version": "8.9.0",
+            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.9.0.tgz",
+            "integrity": "sha512-KTDyRTYX8sWmKXAikPHHSyc63CRPETMctyjKFupcC6OBLXT3xsN0e9aF7m+mIXutFWpUXuedtowG7iLOzp0kQg==",
+            "license": "MIT"
+        },
         "node_modules/universalify": {
             "version": "0.2.0",
             "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
@@ -2376,6 +2602,15 @@
             "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
             "dev": true,
             "license": "MIT"
+        },
+        "node_modules/zod": {
+            "version": "3.25.76",
+            "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+            "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+            "license": "MIT",
+            "funding": {
+                "url": "https://github.com/sponsors/colinhacks"
+            }
         }
     }
 }
diff --git a/package.json b/package.json
index b5bd8f5..36dd610 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,8 @@
         "@ffprobe-installer/ffprobe": "^2.1.2",
         "bcryptjs": "^3.0.3",
         "better-sqlite3": "^12.5.0",
+        "bonjour-service": "^1.4.4",
+        "chromecast-client": "^1.0.1",
         "dotenv": "^17.2.3",
         "express": "^4.18.2",
         "express-session": "^1.18.2",
@@ -27,6 +29,11 @@
     "optionalDependencies": {
         "ffmpeg-static": "^5.3.0"
     },
+    "overrides": {
+        "castv2": {
+            "protobufjs": "^7.6.3"
+        }
+    },
     "engines": {
         "node": ">=18.0.0"
     },
diff --git a/public/css/main.css b/public/css/main.css
index ae672d0..46070f9 100644
--- a/public/css/main.css
+++ b/public/css/main.css
@@ -4610,6 +4610,88 @@ select.form-input optgroup:disabled {
   z-index: 100;
 }
 
+.cast-device-dialog {
+  width: min(520px, calc(100vw - 32px));
+  max-height: min(80vh, 680px);
+  padding: var(--space-lg);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-lg);
+  background: var(--color-bg-secondary);
+  color: var(--color-text-primary);
+  box-shadow: var(--shadow-lg);
+}
+
+.cast-device-dialog::backdrop {
+  background: rgba(0, 0, 0, 0.72);
+}
+
+.cast-dialog-header,
+.cast-dialog-actions {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-sm);
+}
+
+.cast-device-dialog .form-input {
+  width: 100%;
+  margin: var(--space-md) 0;
+}
+
+.cast-device-message {
+  min-height: 1.25rem;
+  margin-bottom: var(--space-sm);
+  color: var(--color-text-muted);
+  font-size: 0.8125rem;
+}
+
+.cast-device-message[data-state="error"] {
+  color: var(--color-error);
+}
+
+.cast-device-list {
+  display: grid;
+  gap: var(--space-sm);
+  max-height: 360px;
+  margin-bottom: var(--space-md);
+  overflow-y: auto;
+}
+
+.cast-device-item {
+  display: grid;
+  gap: 3px;
+  min-height: 56px;
+  padding: var(--space-sm) var(--space-md);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  background: var(--color-bg-tertiary);
+  color: var(--color-text-primary);
+  text-align: left;
+  cursor: pointer;
+}
+
+.cast-device-item:disabled {
+  cursor: not-allowed;
+  opacity: 0.65;
+}
+
+.cast-device-name {
+  font-weight: 600;
+}
+
+.cast-device-status,
+.cast-device-explanation {
+  color: var(--color-text-muted);
+  font-size: 0.75rem;
+}
+
+@media (max-width: 520px) {
+  .cast-dialog-actions {
+    align-items: stretch;
+    flex-direction: column;
+  }
+}
+
 .overflow-menu-item {
   display: flex;
   align-items: center;
diff --git a/public/index.html b/public/index.html
index 5652652..493807b 100644
--- a/public/index.html
+++ b/public/index.html
@@ -1218,11 +1218,27 @@
     </div>
   </div>
 
+  <dialog id="cast-device-dialog" class="cast-device-dialog">
+    <div class="cast-dialog-header">
+      <h2>Play on a device</h2>
+      <button type="button" class="btn btn-ghost" data-cast-action="close" aria-label="Close device picker">×</button>
+    </div>
+    <p class="setting-hint">Choose a device connected to the same network as Nodecast.</p>
+    <input id="cast-device-search" class="form-input" type="search" placeholder="Search devices…" aria-label="Search devices">
+    <div id="cast-device-message" class="cast-device-message" role="status" aria-live="polite"></div>
+    <div id="cast-device-list" class="cast-device-list"></div>
+    <div class="cast-dialog-actions">
+      <button type="button" class="btn btn-secondary" data-cast-action="refresh">Refresh devices</button>
+      <button type="button" class="btn btn-secondary" id="cast-browser-picker">Use browser device picker</button>
+    </div>
+  </dialog>
+
   <!-- JavaScript -->
   <script src="/js/icons.js"></script>
-  <script src="/js/api.js?v=6"></script>
+  <script src="/js/api.js?v=7"></script>
   <script src="/js/services/castService.js?v=1"></script>
-  <script src="/js/components/VideoPlayer.js?v=6"></script>
+  <script src="/js/services/serverCastDevicePicker.js?v=1"></script>
+  <script src="/js/components/VideoPlayer.js?v=7"></script>
   <script src="/js/services/channelLanguageDetection.js?v=1"></script>
   <script src="/js/services/channelLanguageFusion.js?v=1"></script>
   <script src="/js/services/layaStatusPresentation.js?v=6"></script>
@@ -1238,7 +1254,7 @@
   <script src="/js/pages/MoviesPage.js?v=4"></script>
   <script src="/js/pages/SeriesPage.js?v=1"></script>
   <script src="/js/pages/Settings.js?v=8"></script>
-  <script src="/js/pages/WatchPage.js?v=2"></script>
+  <script src="/js/pages/WatchPage.js?v=3"></script>
   <script src="/js/app.js?v=4"></script>
   <script>
     // Check for SSO token in URL
diff --git a/public/js/api.js b/public/js/api.js
index 5ef235f..be078bc 100644
--- a/public/js/api.js
+++ b/public/js/api.js
@@ -65,6 +65,17 @@ const API = {
         estimateByUrl: (url, type) => API.request('POST', '/sources/estimate', { url, type }), // Estimate by URL (before creation)
     },
 
+    cast: {
+        getDevices: () => API.request('GET', '/cast/devices'),
+        devices: () => API.request('GET', '/cast/devices'),
+        refreshDevices: () => API.request('POST', '/cast/devices/refresh'),
+        startSession: (payload) => API.request('POST', '/cast/sessions', payload),
+        createSession: (payload) => API.request('POST', '/cast/sessions', payload),
+        getSessions: () => API.request('GET', '/cast/sessions'),
+        getSession: (id) => API.request('GET', `/cast/sessions/${encodeURIComponent(id)}`),
+        stopSession: (id) => API.request('DELETE', `/cast/sessions/${encodeURIComponent(id)}`)
+    },
+
     // Channels (hidden items)
     channels: {
         getHidden: (sourceId = null) => API.request('GET', `/channels/hidden${sourceId ? `?sourceId=${sourceId}` : ''}`),
diff --git a/public/js/components/VideoPlayer.js b/public/js/components/VideoPlayer.js
index ec99704..b99a802 100644
--- a/public/js/components/VideoPlayer.js
+++ b/public/js/components/VideoPlayer.js
@@ -457,10 +457,23 @@ class VideoPlayer {
             return;
         }
         this.castService = new CastService(this.video);
+        const serverAvailable = typeof ServerCastDevicePicker !== 'undefined'
+            && typeof API !== 'undefined'
+            && Boolean(API.cast);
+        this.serverCastPicker = serverAvailable ? new ServerCastDevicePicker({
+            document,
+            api: API.cast,
+            nativeCastService: this.castService,
+            mediaUrlProvider: () => this.getServerCastMediaPath(),
+            onState: state => {
+                if (status && state.status === 'connected') status.textContent = 'Playing on the selected device.';
+                else if (status && state.status === 'error') status.textContent = state.error || 'Could not connect to a playback device.';
+            }
+        }) : null;
         this.castService.subscribe(state => {
             const unsupported = state.type === 'unsupported';
-            button.hidden = unsupported;
-            button.disabled = !state.available || state.status === 'connecting';
+            button.hidden = unsupported && !serverAvailable;
+            button.disabled = serverAvailable ? false : (!state.available || state.status === 'connecting');
             button.setAttribute('aria-pressed', String(state.status === 'connected'));
             if (status) status.textContent = unsupported ? 'Not supported on this browser'
                 : state.status === 'connected' ? 'Playing on a device'
@@ -470,7 +483,8 @@ class VideoPlayer {
         button.addEventListener('click', async event => {
             event.stopPropagation();
             try {
-                await this.castService.prompt();
+                if (this.serverCastPicker) await this.serverCastPicker.open();
+                else await this.castService.prompt();
             } catch (error) {
                 if (status) status.textContent = 'Could not connect to a playback device.';
                 if (error?.name !== 'NotAllowedError' && error?.name !== 'AbortError') {
@@ -481,6 +495,20 @@ class VideoPlayer {
         void this.castService.watchAvailability();
     }
 
+    getServerCastMediaPath() {
+        const value = String(this.currentUrl || '');
+        if (!value) return null;
+        let path = value;
+        try {
+            const url = new URL(value, window.location.origin);
+            if (url.origin !== window.location.origin || url.search) return null;
+            path = url.pathname;
+        } catch { return null; }
+        const castable = /^\/api\/transcode\/[A-Za-z0-9_-]{1,128}\/stream\.m3u8$/.test(path)
+            || /^\/api\/proxy\/xtream\/\d+\/stream\/[A-Za-z0-9._-]{1,128}\/(?:live|movie|series)$/.test(path);
+        return castable ? path : null;
+    }
+
     /**
      * Add the live quality control to the existing player overflow menu.
      */
diff --git a/public/js/pages/WatchPage.js b/public/js/pages/WatchPage.js
index b30a69e..625a347 100644
--- a/public/js/pages/WatchPage.js
+++ b/public/js/pages/WatchPage.js
@@ -251,10 +251,23 @@ class WatchPage {
             return;
         }
         this.castService = new CastService(this.video);
+        const serverAvailable = typeof ServerCastDevicePicker !== 'undefined'
+            && typeof API !== 'undefined'
+            && Boolean(API.cast);
+        this.serverCastPicker = serverAvailable ? new ServerCastDevicePicker({
+            document,
+            api: API.cast,
+            nativeCastService: this.castService,
+            mediaUrlProvider: () => this.getServerCastMediaPath(),
+            onState: state => {
+                if (status && state.status === 'connected') status.textContent = 'Playing on the selected device.';
+                else if (status && state.status === 'error') status.textContent = state.error || 'Could not connect to a playback device.';
+            }
+        }) : null;
         this.castService.subscribe(state => {
             const unsupported = state.type === 'unsupported';
-            button.hidden = unsupported;
-            button.disabled = !state.available || state.status === 'connecting';
+            button.hidden = unsupported && !serverAvailable;
+            button.disabled = serverAvailable ? false : (!state.available || state.status === 'connecting');
             button.setAttribute('aria-pressed', String(state.status === 'connected'));
             if (status) status.textContent = unsupported ? 'Not supported on this browser'
                 : state.status === 'connected' ? 'Playing on a device'
@@ -264,7 +277,8 @@ class WatchPage {
         button.addEventListener('click', async event => {
             event.stopPropagation();
             try {
-                await this.castService.prompt();
+                if (this.serverCastPicker) await this.serverCastPicker.open();
+                else await this.castService.prompt();
             } catch (error) {
                 if (status) status.textContent = 'Could not connect to a playback device.';
                 if (error?.name !== 'NotAllowedError' && error?.name !== 'AbortError') {
@@ -275,6 +289,20 @@ class WatchPage {
         void this.castService.watchAvailability();
     }
 
+    getServerCastMediaPath() {
+        const value = String(this.currentUrl || '');
+        if (!value) return null;
+        let path = value;
+        try {
+            const url = new URL(value, window.location.origin);
+            if (url.origin !== window.location.origin || url.search) return null;
+            path = url.pathname;
+        } catch { return null; }
+        const castable = /^\/api\/transcode\/[A-Za-z0-9_-]{1,128}\/stream\.m3u8$/.test(path)
+            || /^\/api\/proxy\/xtream\/\d+\/stream\/[A-Za-z0-9._-]{1,128}\/(?:live|movie|series)$/.test(path);
+        return castable ? path : null;
+    }
+
     /**
      * Main entry point - play content
      * @param {Object} content - Movie or episode info
diff --git a/public/js/services/serverCastDevicePicker.js b/public/js/services/serverCastDevicePicker.js
new file mode 100644
index 0000000..267cbbd
--- /dev/null
+++ b/public/js/services/serverCastDevicePicker.js
@@ -0,0 +1,181 @@
+(function (root, factory) {
+    const exports = factory();
+    if (typeof module === 'object' && module.exports) module.exports = exports;
+    if (root) root.ServerCastDevicePicker = exports.ServerCastDevicePicker;
+})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
+    class ServerCastDevicePicker {
+        constructor(options = {}) {
+            this.document = options.document || (typeof document !== 'undefined' ? document : null);
+            this.api = options.api;
+            this.nativeCastService = options.nativeCastService || null;
+            this.mediaUrlProvider = options.mediaUrlProvider || (() => '');
+            this.onState = options.onState || (() => {});
+            this.devices = [];
+            this.query = '';
+            this.ensureDialog();
+            this.attachListeners();
+        }
+
+        ensureDialog() {
+            if (!this.document) return;
+            this.dialog = this.document.getElementById('cast-device-dialog');
+            if (!this.dialog) {
+                this.dialog = this.document.createElement('dialog');
+                this.dialog.id = 'cast-device-dialog';
+                this.dialog.className = 'cast-device-dialog';
+                this.dialog.innerHTML = this.dialogContent();
+                this.document.body.appendChild(this.dialog);
+            }
+            this.list = this.document.getElementById('cast-device-list');
+            this.search = this.document.getElementById('cast-device-search');
+            this.message = this.document.getElementById('cast-device-message');
+            this.nativeButton = this.document.getElementById('cast-browser-picker');
+        }
+
+        dialogContent() {
+            return `<div class="cast-dialog-header"><h2>Play on a device</h2>
+              <button type="button" class="btn btn-ghost" data-cast-action="close" aria-label="Close device picker">×</button></div>
+              <p class="setting-hint">Choose a device connected to the same network as Nodecast.</p>
+              <input id="cast-device-search" class="form-input" type="search" placeholder="Search devices…" aria-label="Search devices">
+              <div id="cast-device-message" class="cast-device-message" role="status" aria-live="polite"></div>
+              <div id="cast-device-list" class="cast-device-list"></div>
+              <div class="cast-dialog-actions">
+                <button type="button" class="btn btn-secondary" data-cast-action="refresh">Refresh devices</button>
+                <button type="button" class="btn btn-secondary" id="cast-browser-picker">Use browser device picker</button>
+              </div>`;
+        }
+
+        attachListeners() {
+            this.dialog?.querySelector('[data-cast-action="close"]')?.addEventListener('click', () => this.close());
+            this.dialog?.querySelector('[data-cast-action="refresh"]')?.addEventListener('click', () => void this.loadDevices(true));
+            this.search?.addEventListener('input', event => {
+                this.query = event.target.value.toLowerCase().trim();
+                this.renderDevices();
+            });
+            this.nativeButton?.addEventListener('click', async () => {
+                try {
+                    await this.nativeCastService?.prompt?.();
+                    this.setMessage('Browser device picker opened.');
+                } catch (error) {
+                    this.setMessage('The browser device picker could not be opened.', 'error');
+                }
+            });
+            this.dialog?.addEventListener('cancel', event => {
+                event.preventDefault();
+                this.close();
+            });
+        }
+
+        async open() {
+            if (!this.dialog) return;
+            if (typeof this.dialog.showModal === 'function') this.dialog.showModal();
+            else {
+                this.dialog.hidden = false;
+                this.dialog.setAttribute('open', '');
+            }
+            this.updateNativeAction();
+            await this.loadDevices(false);
+            this.search?.focus();
+        }
+
+        close() {
+            if (typeof this.dialog?.close === 'function') this.dialog.close();
+            else {
+                this.dialog?.removeAttribute('open');
+                if (this.dialog) this.dialog.hidden = true;
+            }
+        }
+
+        updateNativeAction() {
+            if (!this.nativeButton) return;
+            const state = this.nativeCastService?.state;
+            const supported = Boolean(state && (state.type !== 'unsupported' || state.available));
+            this.nativeButton.hidden = !supported;
+        }
+
+        async loadDevices(refresh) {
+            this.setMessage(refresh ? 'Refreshing devices…' : 'Looking for devices…');
+            try {
+                const result = refresh ? await this.api.refreshDevices() : await this.api.getDevices();
+                this.devices = Array.isArray(result) ? result : (result?.devices || []);
+                this.renderDevices();
+                this.setMessage(this.devices.length ? '' : 'No server-managed devices found.');
+            } catch (error) {
+                this.devices = [];
+                this.renderDevices();
+                const message = error?.message || 'Unable to discover devices.';
+                this.setMessage(/base url|localhost|lan|nodecast/i.test(message)
+                    ? `Nodecast is not reachable by devices: ${message}`
+                    : message, 'error');
+            }
+        }
+
+        renderDevices() {
+            if (!this.list) return;
+            const devices = this.devices.filter(device =>
+                !this.query || `${device.name || ''} ${device.type || device.kind || ''}`.toLowerCase().includes(this.query)
+            );
+            this.list.innerHTML = devices.map(device => {
+                const type = device.type || device.kind || 'device';
+                const receiverRequired = type === 'fire_tv' && device.status === 'receiver_required';
+                const connectable = !receiverRequired && device.ready !== false && ['google_cast', 'android_tv_cast'].includes(type);
+                const status = receiverRequired
+                    ? 'Receiver required'
+                    : connectable ? 'Ready' : (device.status || 'Unavailable');
+                const explanation = receiverRequired
+                    ? 'Install and configure a compatible receiver app on this Fire TV before connecting.'
+                    : '';
+                return `<button type="button" class="cast-device-item" data-device-id="${this.escape(device.id)}" ${connectable ? '' : 'disabled'}>
+                  <span class="cast-device-name">${this.escape(device.name || 'Unnamed device')}</span>
+                  <span class="cast-device-status">${this.escape(status)}</span>
+                  ${explanation ? `<span class="cast-device-explanation">${this.escape(explanation)}</span>` : ''}
+                </button>`;
+            }).join('') || '<p class="hint">No devices match your search.</p>';
+            this.list.querySelectorAll('[data-device-id]:not(:disabled)').forEach(button => {
+                button.addEventListener('click', () => void this.connect(button.dataset.deviceId));
+            });
+        }
+
+        async connect(deviceId) {
+            const mediaPath = this.mediaUrlProvider();
+            if (!this.isAllowedMediaPath(mediaPath)) {
+                this.setMessage('This stream is not ready for server casting yet. Continue playback here or use the browser device picker.', 'error');
+                return;
+            }
+            this.setMessage('Connecting…');
+            this.onState({ status: 'connecting', deviceId });
+            try {
+                const session = await this.api.startSession({ deviceId, mediaPath });
+                this.setMessage('Playing on the selected device.');
+                this.onState({ status: 'connected', deviceId, session });
+                this.close();
+            } catch (error) {
+                const message = error?.message || 'Unable to start device playback.';
+                this.setMessage(/base url|localhost|lan|nodecast/i.test(message)
+                    ? `Nodecast is not reachable by this device: ${message}`
+                    : message, 'error');
+                this.onState({ status: 'error', deviceId, error: message });
+            }
+        }
+
+        isAllowedMediaPath(value) {
+            if (typeof value !== 'string' || value.includes('?')) return false;
+            return /^\/api\/transcode\/[A-Za-z0-9_-]{1,128}\/stream\.m3u8$/.test(value)
+                || /^\/api\/proxy\/xtream\/\d+\/stream\/[A-Za-z0-9._-]{1,128}\/(?:live|movie|series)$/.test(value);
+        }
+
+        setMessage(message, state = '') {
+            if (this.message) {
+                this.message.textContent = message;
+                this.message.dataset.state = state;
+            }
+        }
+
+        escape(value) {
+            return String(value ?? '').replace(/&/g, '&amp;').replace(/</g, '&lt;')
+                .replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#039;');
+        }
+    }
+
+    return { ServerCastDevicePicker };
+});
diff --git a/server/index.js b/server/index.js
index c580887..30db527 100644
--- a/server/index.js
+++ b/server/index.js
@@ -182,6 +182,7 @@ app.use('/api/settings', require('./routes/settings'));
 app.use('/api/history', require('./routes/history'));
 app.use('/api/laya', require('./routes/laya'));
 app.use('/api/live', require('./routes/live'));
+app.use('/api/cast', require('./routes/cast'));
 
 // Version endpoint
 app.get('/api/version', (req, res) => {
diff --git a/server/routes/cast.js b/server/routes/cast.js
new file mode 100644
index 0000000..ca05616
--- /dev/null
+++ b/server/routes/cast.js
@@ -0,0 +1,117 @@
+const express = require('express');
+const { Readable } = require('stream');
+const { requireAuth } = require('../auth');
+const { createCastMediaUrlService } = require('../services/castMediaUrlService');
+const { createCastSessionService } = require('../services/castSessionService');
+
+const router = express.Router();
+const publicBaseUrl = process.env.CAST_PUBLIC_BASE_URL;
+const mediaUrls = createCastMediaUrlService({
+    publicBaseUrl: publicBaseUrl || 'http://127.0.0.1',
+    secret: process.env.CAST_SIGNING_SECRET
+});
+const cast = createCastSessionService({ publicBaseUrl, mediaUrlSigner: mediaUrls });
+
+function statusFor(error) {
+    if (error.code === 'CAST_DEVICE_NOT_FOUND' || error.code === 'CAST_SESSION_NOT_FOUND') return 404;
+    if (error.code === 'CAST_ADAPTER_UNAVAILABLE' || error.code === 'CAST_CONTROL_UNAVAILABLE' || error.code === 'CAST_CONFIG_INVALID') return 503;
+    if (error.code?.startsWith('CAST_')) return 409;
+    return 400;
+}
+
+function validateCommandBody(action, body) {
+    if (!body || typeof body !== 'object' || Array.isArray(body)) throw new Error('Command body must be an object');
+    const keys = Object.keys(body);
+    if (action === 'seek') {
+        if (keys.length !== 1 || keys[0] !== 'currentTime' || !Number.isFinite(body.currentTime) || body.currentTime < 0) {
+            throw new Error('seek requires currentTime as a number greater than or equal to 0');
+        }
+        return { currentTime: body.currentTime };
+    }
+    if (action === 'volume') {
+        if (keys.some(key => !['level', 'muted'].includes(key)) || !keys.length) throw new Error('volume accepts only level and muted');
+        if (body.level !== undefined && (!Number.isFinite(body.level) || body.level < 0 || body.level > 1)) throw new Error('volume level must be between 0 and 1');
+        if (body.muted !== undefined && typeof body.muted !== 'boolean') throw new Error('volume muted must be boolean');
+        return { ...(body.level !== undefined ? { level: body.level } : {}), ...(body.muted !== undefined ? { muted: body.muted } : {}) };
+    }
+    if (keys.length) throw new Error(`${action} does not accept a request body`);
+    return {};
+}
+
+function validId(value) {
+    return typeof value === 'string' && /^[A-Za-z0-9_-]{1,128}$/.test(value);
+}
+
+// Signed media delivery intentionally precedes authentication: a Cast receiver has
+// no browser cookie. The short-lived opaque HMAC token is the authorization.
+router.get('/media/:id', async (req, res) => {
+    try {
+        const { path } = mediaUrls.validate(req.params.id, req.query.token);
+        if (path.startsWith('/api/cast/')) return res.status(400).json({ error: 'Invalid cast media target' });
+        const target = new URL(path, publicBaseUrl || `${req.protocol}://${req.get('host')}`);
+        const headers = {};
+        if (req.get('range')) headers.range = req.get('range');
+        const response = await fetch(target, { headers, redirect: 'follow' });
+        res.status(response.status);
+        for (const header of ['content-type', 'content-length', 'content-range', 'accept-ranges', 'cache-control']) {
+            const value = response.headers.get(header);
+            if (value) res.setHeader(header, value);
+        }
+        if (!response.body) return res.end();
+        Readable.fromWeb(response.body).pipe(res);
+    } catch (error) {
+        console.warn('[Cast] Public media request failed:', error.message);
+        return res.status(/token/i.test(error.message) ? 401 : 502).json({ error: 'Cast media is unavailable' });
+    }
+});
+
+router.use(requireAuth);
+
+router.get('/devices', async (req, res) => {
+    try { res.json({ devices: await cast.getDevices() }); }
+    catch (error) { res.status(statusFor(error)).json({ error: error.message, code: error.code }); }
+});
+
+router.post('/devices/refresh', async (req, res) => {
+    try { res.json({ devices: await cast.refreshDevices() }); }
+    catch (error) { res.status(statusFor(error)).json({ error: error.message, code: error.code }); }
+});
+
+router.get('/sessions', (req, res) => res.json({ sessions: cast.listSessions() }));
+
+router.post('/sessions', async (req, res) => {
+    try { res.status(201).json(await cast.startSession(req.body)); }
+    catch (error) { res.status(statusFor(error)).json({ error: error.message, code: error.code }); }
+});
+
+router.get('/sessions/:id', (req, res) => {
+    if (!validId(req.params.id)) return res.status(400).json({ error: 'Invalid session ID' });
+    const session = cast.getSession(req.params.id);
+    return session ? res.json(session) : res.status(404).json({ error: 'Cast session not found' });
+});
+
+router.delete('/sessions/:id', async (req, res) => {
+    try {
+        if (!validId(req.params.id)) return res.status(400).json({ error: 'Invalid session ID' });
+        const stopped = await cast.stopSession(req.params.id);
+        return stopped ? res.status(204).end() : res.status(404).json({ error: 'Cast session not found' });
+    } catch (error) { return res.status(statusFor(error)).json({ error: error.message, code: error.code }); }
+});
+
+for (const action of ['play', 'pause', 'stop', 'seek', 'volume']) {
+    router.post(`/sessions/:id/${action}`, async (req, res) => {
+        try {
+            if (!validId(req.params.id)) return res.status(400).json({ error: 'Invalid session ID' });
+            const body = validateCommandBody(action, req.body || {});
+            if (action === 'stop') {
+                const stopped = await cast.stopSession(req.params.id);
+                return stopped ? res.json({ success: true }) : res.status(404).json({ error: 'Cast session not found' });
+            }
+            res.json(await cast.command(req.params.id, action, body));
+        }
+        catch (error) { res.status(statusFor(error)).json({ error: error.message, code: error.code }); }
+    });
+}
+
+module.exports = router;
+module.exports.validateCommandBody = validateCommandBody;
diff --git a/server/services/castMediaUrlService.js b/server/services/castMediaUrlService.js
new file mode 100644
index 0000000..58bc7d4
--- /dev/null
+++ b/server/services/castMediaUrlService.js
@@ -0,0 +1,76 @@
+const crypto = require('crypto');
+
+function encode(value) {
+    return Buffer.from(value).toString('base64url');
+}
+
+function timingSafeEqual(left, right) {
+    const a = Buffer.from(left);
+    const b = Buffer.from(right);
+    return a.length === b.length && crypto.timingSafeEqual(a, b);
+}
+
+function createCastMediaUrlService(options = {}) {
+    const secret = String(options.secret || process.env.CAST_SIGNING_SECRET || '');
+    const publicBaseUrl = String(options.publicBaseUrl || process.env.CAST_PUBLIC_BASE_URL || '').replace(/\/$/, '');
+    const ttlMs = Number(options.ttlMs || 5 * 60 * 1000);
+    const now = options.now || Date.now;
+    const paths = new Map();
+
+    function requireSecret() {
+        if (Buffer.byteLength(secret, 'utf8') < 32) {
+            throw Object.assign(new Error('CAST_SIGNING_SECRET must contain at least 32 bytes'), { code: 'CAST_CONFIG_INVALID' });
+        }
+    }
+
+    function signature(payload) {
+        requireSecret();
+        return crypto.createHmac('sha256', secret).update(payload).digest('base64url');
+    }
+
+    function sign(path) {
+        if (!path || !String(path).startsWith('/')) throw new Error('Cast media path must be absolute');
+        if (!publicBaseUrl) throw new Error('CAST_PUBLIC_BASE_URL is required for cast media URLs');
+        const id = crypto.randomBytes(18).toString('base64url');
+        const exp = now() + ttlMs;
+        const pathHash = crypto.createHash('sha256').update(String(path)).digest('base64url');
+        const payload = encode(JSON.stringify({ id, exp, pathHash }));
+        paths.set(id, { path: String(path), exp });
+        const token = `${payload}.${signature(payload)}`;
+        return `${publicBaseUrl}/api/cast/media/${id}?token=${encodeURIComponent(token)}`;
+    }
+
+    function validate(id, token) {
+        requireSecret();
+        if (!id || typeof id !== 'string') throw new Error('Invalid cast media token');
+        if (!token || typeof token !== 'string') throw new Error('Invalid cast media token');
+        const [payload, providedSignature, extra] = token.split('.');
+        if (!payload || !providedSignature || extra || !timingSafeEqual(signature(payload), providedSignature)) {
+            throw new Error('Invalid cast media token');
+        }
+        let claims;
+        try { claims = JSON.parse(Buffer.from(payload, 'base64url').toString('utf8')); }
+        catch { throw new Error('Invalid cast media token'); }
+        if (claims.id !== id) throw new Error('Invalid cast media token');
+        if (!Number.isFinite(claims.exp) || now() > claims.exp) {
+            paths.delete(claims.id);
+            throw new Error('Expired cast media token');
+        }
+        const entry = paths.get(claims.id);
+        if (!entry || entry.exp !== claims.exp) throw new Error('Invalid cast media token');
+        const pathHash = crypto.createHash('sha256').update(entry.path).digest('base64url');
+        if (!claims.pathHash || !timingSafeEqual(pathHash, claims.pathHash)) throw new Error('Invalid cast media token');
+        return { path: entry.path };
+    }
+
+    function revoke(idOrUrl) {
+        const value = String(idOrUrl || '');
+        let id = value;
+        try { id = new URL(value, publicBaseUrl || 'http://invalid').pathname.split('/').filter(Boolean).at(-1); } catch { /* use raw id */ }
+        return paths.delete(id);
+    }
+
+    return { revoke, sign, validate };
+}
+
+module.exports = { createCastMediaUrlService };
diff --git a/server/services/castSessionService.js b/server/services/castSessionService.js
new file mode 100644
index 0000000..d463106
--- /dev/null
+++ b/server/services/castSessionService.js
@@ -0,0 +1,126 @@
+const crypto = require('crypto');
+const { createGoogleCastAdapter } = require('./googleCastAdapter');
+const { createCastMediaUrlService } = require('./castMediaUrlService');
+
+function validatePublicBaseUrl(value) {
+    let url;
+    try { url = new URL(value); } catch { throw new Error('A castable LAN public base URL is required'); }
+    if (!['http:', 'https:'].includes(url.protocol)) throw new Error('Cast public base URL must use HTTP or HTTPS');
+    const host = url.hostname.toLowerCase().replace(/^\[|\]$/g, '');
+    if (!host || host === 'localhost' || host === '127.0.0.1' || host === '::1') {
+        throw new Error('Cast public base URL must use a LAN address, not localhost');
+    }
+    return url;
+}
+
+function assertExactKeys(value, allowed, label) {
+    if (!value || typeof value !== 'object' || Array.isArray(value)) throw new Error(`${label} must be an object`);
+    const unknown = Object.keys(value).find(key => !allowed.includes(key));
+    if (unknown) throw new Error(`Unknown ${label} field: ${unknown}`);
+}
+
+function validateMediaPath(value) {
+    if (typeof value !== 'string' || !value || value.length > 512) throw new Error('mediaPath must be a string of at most 512 characters');
+    if (/url\s*=\s*(?:https?%3a|https?:)/i.test(value) || value.startsWith('/api/proxy/stream')) {
+        throw new Error('Raw upstream media URLs cannot be cast');
+    }
+    const path = value.split('?')[0];
+    const safe = /^\/api\/transcode\/[A-Za-z0-9_-]{1,128}\/stream\.m3u8$/.test(path) ||
+        /^\/api\/proxy\/xtream\/\d+\/stream\/[A-Za-z0-9._-]{1,128}\/(?:live|movie|series)$/.test(path);
+    if (!safe || value.includes('?')) throw new Error('mediaPath is not an allowed cast media endpoint');
+    return value;
+}
+
+function validateStartRequest(request) {
+    assertExactKeys(request, ['deviceId', 'mediaPath', 'media'], 'session');
+    if (typeof request.deviceId !== 'string' || !request.deviceId.trim() || request.deviceId.length > 128) {
+        throw new Error('deviceId must be a non-empty string of at most 128 characters');
+    }
+    validateMediaPath(request.mediaPath);
+    if (request.media !== undefined) {
+        assertExactKeys(request.media, ['contentType', 'streamType', 'autoplay', 'currentTime', 'title'], 'media');
+        if (request.media.contentType !== undefined && (typeof request.media.contentType !== 'string' || request.media.contentType.length > 128)) throw new Error('Invalid media contentType');
+        if (request.media.streamType !== undefined && !['LIVE', 'BUFFERED', 'OTHER'].includes(request.media.streamType)) throw new Error('Invalid media streamType');
+        if (request.media.autoplay !== undefined && typeof request.media.autoplay !== 'boolean') throw new Error('Invalid media autoplay');
+        if (request.media.currentTime !== undefined && (!Number.isFinite(request.media.currentTime) || request.media.currentTime < 0)) throw new Error('Invalid media currentTime');
+        if (request.media.title !== undefined && (typeof request.media.title !== 'string' || request.media.title.length > 200)) throw new Error('Invalid media title');
+    }
+}
+
+function createCastSessionService(options = {}) {
+    const adapter = options.adapter || createGoogleCastAdapter();
+    const publicBaseUrl = options.publicBaseUrl || process.env.CAST_PUBLIC_BASE_URL;
+    const mediaUrlSigner = options.mediaUrlSigner || createCastMediaUrlService({
+        publicBaseUrl: publicBaseUrl || 'http://127.0.0.1',
+        secret: options.secret
+    });
+    const sessions = new Map();
+    const discoveryTtlMs = Number(options.discoveryTtlMs || 15_000);
+    const now = options.now || Date.now;
+    let devices = [];
+    let devicesRefreshedAt = 0;
+
+    async function refreshDevices() {
+        devices = (await adapter.discover()).map(device => ({ ...device }));
+        devicesRefreshedAt = now();
+        return devices;
+    }
+
+    async function getDevices() {
+        if (!devices.length || now() - devicesRefreshedAt >= discoveryTtlMs) await refreshDevices();
+        return devices;
+    }
+
+    async function startSession(request = {}) {
+        const base = validatePublicBaseUrl(publicBaseUrl);
+        validateStartRequest(request);
+        const available = await getDevices();
+        const device = available.find(item => String(item.id) === String(request.deviceId));
+        if (!device) throw Object.assign(new Error('Cast device not found'), { code: 'CAST_DEVICE_NOT_FOUND' });
+        const type = device.type || device.kind;
+        if (type === 'fire_tv' && device.status === 'receiver_required') {
+            throw Object.assign(new Error('Fire TV requires a compatible receiver application'), { code: 'CAST_RECEIVER_REQUIRED' });
+        }
+        if (device.ready === false) throw Object.assign(new Error('Cast device is not ready'), { code: 'CAST_DEVICE_NOT_READY' });
+        const signed = mediaUrlSigner.sign(String(request.mediaPath));
+        const mediaUrl = new URL(signed, base).toString();
+        const result = await adapter.startSession({ ...request, mediaUrl, device });
+        const session = {
+            id: result.sessionId || crypto.randomUUID(),
+            sessionId: result.sessionId || null,
+            deviceId: request.deviceId,
+            mediaUrl,
+            state: result.state || 'playing',
+            ...result
+        };
+        session.sessionId ||= session.id;
+        sessions.set(session.sessionId, session);
+        return session;
+    }
+
+    function getSession(id) { return sessions.get(String(id)) || null; }
+    function listSessions() { return [...sessions.values()]; }
+
+    async function command(id, action, payload = {}) {
+        const session = getSession(id);
+        if (!session) throw Object.assign(new Error('Cast session not found'), { code: 'CAST_SESSION_NOT_FOUND' });
+        if (typeof adapter.command !== 'function') throw Object.assign(new Error('Cast controls are unavailable'), { code: 'CAST_CONTROL_UNAVAILABLE' });
+        const result = await adapter.command({ session, action, ...payload });
+        Object.assign(session, result || {}, { state: result?.state || action });
+        return session;
+    }
+
+    async function stopSession(id) {
+        const session = getSession(id);
+        if (!session) return false;
+        if (typeof adapter.stopSession === 'function') await adapter.stopSession(session);
+        else if (typeof adapter.command === 'function') await adapter.command({ session, action: 'stop' });
+        mediaUrlSigner.revoke?.(session.mediaUrl);
+        sessions.delete(String(id));
+        return true;
+    }
+
+    return { command, getDevices, getSession, listSessions, refreshDevices, startSession, stopSession };
+}
+
+module.exports = { createCastSessionService, validateMediaPath, validatePublicBaseUrl, validateStartRequest };
diff --git a/server/services/googleCastAdapter.js b/server/services/googleCastAdapter.js
new file mode 100644
index 0000000..3fa2fff
--- /dev/null
+++ b/server/services/googleCastAdapter.js
@@ -0,0 +1,131 @@
+const crypto = require('crypto');
+
+function defaultDependencies() {
+    return { Bonjour: require('bonjour-service'), castClient: require('chromecast-client') };
+}
+
+function firstAddress(service) {
+    return (service.addresses || []).find(address => /^\d{1,3}(?:\.\d{1,3}){3}$/.test(address)) ||
+        service.addresses?.[0] || service.referer?.address || service.host || null;
+}
+
+function normalizeDevice(service) {
+    const txt = service.txt || {};
+    const model = String(txt.md || txt.model || '').trim();
+    const descriptor = `${model} ${service.name || ''}`.toLowerCase();
+    const host = firstAddress(service);
+    return {
+        id: String(txt.id || service.fqdn || service.name || `${host}:${service.port || 8009}`),
+        name: String(txt.fn || service.name || model || 'Google Cast device'),
+        type: /android tv|google tv|chromecast built-in|bravia|shield/.test(descriptor) ? 'android_tv_cast' : 'google_cast',
+        ready: Boolean(host),
+        host,
+        port: Number(service.port || 8009),
+        model: model || null
+    };
+}
+
+function unwrap(result, castClient) {
+    if (result && typeof result.unwrapAndThrow === 'function') return result.unwrapAndThrow();
+    if (castClient.Result?.unwrapAndThrow) return castClient.Result.unwrapAndThrow(result);
+    if (result && result.isOk === false) throw result.value;
+    if (result && result.isOk === true) return result.value;
+    return result;
+}
+
+function createGoogleCastAdapter(options = {}) {
+    let dependencies;
+    try { dependencies = options.dependencies || defaultDependencies(); }
+    catch (error) {
+        return {
+            async discover() { return []; },
+            async startSession() {
+                throw Object.assign(new Error(`Google Cast support is unavailable: ${error.message}`), { code: 'CAST_ADAPTER_UNAVAILABLE' });
+            }
+        };
+    }
+
+    const { Bonjour, castClient } = dependencies;
+    const discoveryTimeoutMs = Number(options.discoveryTimeoutMs || 1500);
+    const connectTimeoutMs = Number(options.connectTimeoutMs || 8000);
+    const sessions = new Map();
+
+    async function discover() {
+        const bonjour = new Bonjour(undefined, () => {});
+        const found = new Map();
+        let browser;
+        let timer;
+        try {
+            await new Promise(resolve => {
+                timer = setTimeout(resolve, discoveryTimeoutMs);
+                browser = bonjour.find({ type: 'googlecast', protocol: 'tcp' }, service => {
+                    const device = normalizeDevice(service);
+                    if (device.host) found.set(device.id, device);
+                });
+                browser?.on?.('error', resolve);
+            });
+            return [...found.values()].sort((left, right) => left.name.localeCompare(right.name));
+        } catch (error) {
+            throw Object.assign(new Error(`Google Cast discovery failed: ${error.message}`), { code: 'CAST_DISCOVERY_FAILED' });
+        } finally {
+            clearTimeout(timer);
+            try { browser?.stop?.(); } catch { /* best effort */ }
+            try { bonjour.destroy(); } catch { /* best effort */ }
+        }
+    }
+
+    async function startSession({ device, mediaUrl, media = {} }) {
+        if (!device?.host) throw Object.assign(new Error('Google Cast device has no reachable host'), { code: 'CAST_DEVICE_UNREACHABLE' });
+        let client;
+        let controller;
+        try {
+            client = await castClient.connect({ host: device.host, port: device.port || 8009, timeout: connectTimeoutMs });
+            controller = unwrap(await castClient.DefaultMediaApp.launchAndJoin({ client }), castClient);
+            const status = unwrap(await controller.load({
+                media: {
+                    contentId: mediaUrl,
+                    contentType: media.contentType || 'application/vnd.apple.mpegurl',
+                    streamType: media.streamType || 'LIVE',
+                    metadata: media.metadata || { metadataType: 0, title: media.title || 'Nodecast TV' }
+                },
+                autoplay: media.autoplay !== false,
+                currentTime: Number(media.currentTime || 0)
+            }), castClient);
+            const sessionId = crypto.randomUUID();
+            sessions.set(sessionId, { client, controller, device });
+            return { sessionId, state: String(status?.playerState || 'PLAYING').toLowerCase(), currentTime: Number(status?.currentTime || 0) };
+        } catch (error) {
+            try { controller?.dispose?.(); } catch { /* best effort */ }
+            try { client?.close?.(); } catch { /* best effort */ }
+            throw Object.assign(new Error(`Unable to start Google Cast playback: ${error.message}`), { code: 'CAST_START_FAILED' });
+        }
+    }
+
+    async function command({ session, action, ...payload }) {
+        const active = sessions.get(session.sessionId || session.id);
+        if (!active) throw Object.assign(new Error('Google Cast connection is no longer active'), { code: 'CAST_SESSION_DISCONNECTED' });
+        if (action === 'volume') throw Object.assign(new Error('Volume control is unavailable for this Cast adapter'), { code: 'CAST_CONTROL_UNAVAILABLE' });
+        const method = active.controller[action];
+        if (typeof method !== 'function') throw Object.assign(new Error(`Unsupported Cast command: ${action}`), { code: 'CAST_CONTROL_UNAVAILABLE' });
+        const argument = action === 'seek'
+            ? (payload.currentTime !== undefined ? { currentTime: Number(payload.currentTime) } : { relativeTime: Number(payload.relativeTime || 0) })
+            : undefined;
+        const status = unwrap(await (argument ? method(argument) : method()), castClient);
+        return { state: String(status?.playerState || action).toLowerCase(), currentTime: Number(status?.currentTime || 0) };
+    }
+
+    async function stopSession(session) {
+        const id = session.sessionId || session.id;
+        const active = sessions.get(id);
+        if (!active) return;
+        try { unwrap(await active.controller.stop(), castClient); } finally {
+            try { active.controller.dispose?.(); } catch { /* best effort */ }
+            try { active.client.close?.(); } catch { /* best effort */ }
+            sessions.delete(id);
+        }
+    }
+
+    return { command, discover, startSession, stopSession };
+}
+
+module.exports = { createGoogleCastAdapter, normalizeDevice };
diff --git a/test/t34ServerCast.test.js b/test/t34ServerCast.test.js
new file mode 100644
index 0000000..06facbb
--- /dev/null
+++ b/test/t34ServerCast.test.js
@@ -0,0 +1,301 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { JSDOM } = require('jsdom');
+
+const root = path.resolve(__dirname, '..');
+
+function requireExisting(relativePath) {
+    const absolutePath = path.join(root, relativePath);
+    assert.ok(fs.existsSync(absolutePath), `${relativePath} should exist`);
+    delete require.cache[require.resolve(absolutePath)];
+    return require(absolutePath);
+}
+
+test('server registers authenticated cast routes for discovery, refresh and session creation', () => {
+    const indexSource = fs.readFileSync(path.join(root, 'server', 'index.js'), 'utf8');
+    assert.match(indexSource, /app\.use\('\/api\/cast',\s*require\('\.\/routes\/cast'\)\)/);
+
+    const routeSource = fs.readFileSync(path.join(root, 'server', 'routes', 'cast.js'), 'utf8');
+    assert.match(routeSource, /router\.get\('\/devices'/, 'GET /api/cast/devices should be routed');
+    assert.match(routeSource, /router\.post\('\/devices\/refresh'/, 'POST /api/cast/devices/refresh should be routed');
+    assert.match(routeSource, /router\.post\('\/sessions'/, 'POST /api/cast/sessions should be routed');
+    assert.match(routeSource, /requireAuth/, 'cast API should require authenticated users');
+});
+
+test('server cast session service rejects non-castable base URLs and calls the adapter with an absolute media URL', async () => {
+    const { createCastSessionService } = requireExisting('server/services/castSessionService.js');
+    assert.equal(typeof createCastSessionService, 'function');
+
+    const adapterCalls = [];
+    const adapter = {
+        discover: async () => [
+            { id: 'living-room', kind: 'google_cast', name: 'Living Room TV', ready: true }
+        ],
+        startSession: async request => {
+            adapterCalls.push(request);
+            return { sessionId: 'session-1' };
+        }
+    };
+
+    const localhostService = createCastSessionService({
+        adapter,
+        publicBaseUrl: 'http://localhost:3000',
+        mediaUrlSigner: { sign: pathValue => `/api/cast/media/${pathValue}?token=abc` }
+    });
+    await assert.rejects(
+        () => localhostService.startSession({ deviceId: 'living-room', mediaPath: '/api/proxy/stream?url=http%3A%2F%2Fexample.test%2Flive.m3u8' }),
+        /LAN|castable|localhost|base URL/i
+    );
+
+    const lanService = createCastSessionService({
+        adapter,
+        publicBaseUrl: 'http://192.168.1.40:3000',
+        mediaUrlSigner: { sign: pathValue => `/api/cast/media${pathValue}?token=abc` }
+    });
+    const result = await lanService.startSession({
+        deviceId: 'living-room',
+        mediaPath: '/api/transcode/session-safe/stream.m3u8'
+    });
+
+    assert.equal(result.sessionId, 'session-1');
+    assert.equal(adapterCalls.length, 1);
+    assert.equal(adapterCalls[0].deviceId, 'living-room');
+    assert.match(adapterCalls[0].mediaUrl, /^http:\/\/192\.168\.1\.40:3000\/api\/cast\/media/);
+    assert.doesNotMatch(adapterCalls[0].mediaUrl, /localhost|127\.0\.0\.1/);
+});
+
+test('cast media URL signer creates absolute cookie-free URLs and rejects invalid or expired tokens', () => {
+    const { createCastMediaUrlService } = requireExisting('server/services/castMediaUrlService.js');
+    assert.equal(typeof createCastMediaUrlService, 'function');
+
+    let now = 1_000;
+    const service = createCastMediaUrlService({
+        secret: 'test-secret-with-at-least-32-bytes-long',
+        publicBaseUrl: 'http://192.168.1.40:3000',
+        ttlMs: 30_000,
+        now: () => now
+    });
+
+    const mediaUrl = service.sign('/api/transcode/session-1/stream.m3u8');
+    assert.match(mediaUrl, /^http:\/\/192\.168\.1\.40:3000\/api\/cast\/media\//);
+    assert.match(mediaUrl, /token=/);
+    assert.doesNotMatch(mediaUrl, /Cookie|authToken|session/i);
+
+    const parsed = new URL(mediaUrl);
+    const id = parsed.pathname.split('/').at(-1);
+    const token = parsed.searchParams.get('token');
+    const validated = service.validate(id, token);
+    assert.deepEqual(validated, { path: '/api/transcode/session-1/stream.m3u8' });
+
+    assert.throws(() => service.validate(id, 'bad-token'), /invalid|token/i);
+    assert.throws(() => service.validate('different-id', token), /invalid|token/i);
+    now += 31_000;
+    assert.throws(() => service.validate(id, token), /expired|token/i);
+});
+
+test('cast signing requires a dedicated strong secret and supports revocation', () => {
+    const { createCastMediaUrlService } = requireExisting('server/services/castMediaUrlService.js');
+    const missing = createCastMediaUrlService({ publicBaseUrl: 'http://192.168.1.40:3000', secret: '' });
+    assert.throws(() => missing.sign('/api/transcode/session-1/stream.m3u8'), /CAST_SIGNING_SECRET|32 bytes/i);
+    const weak = createCastMediaUrlService({ publicBaseUrl: 'http://192.168.1.40:3000', secret: 'too-short' });
+    assert.throws(() => weak.sign('/api/transcode/session-1/stream.m3u8'), /CAST_SIGNING_SECRET|32 bytes/i);
+
+    const service = createCastMediaUrlService({
+        publicBaseUrl: 'http://192.168.1.40:3000', secret: 'another-test-secret-with-32-bytes-minimum'
+    });
+    const mediaUrl = service.sign('/api/transcode/session-1/stream.m3u8');
+    const parsed = new URL(mediaUrl);
+    const id = parsed.pathname.split('/').at(-1);
+    const token = parsed.searchParams.get('token');
+    assert.equal(service.revoke(mediaUrl), true);
+    assert.throws(() => service.validate(id, token), /invalid|token/i);
+});
+
+test('cast session validation rejects upstream URLs, unknown fields and oversized identifiers', async () => {
+    const { createCastSessionService } = requireExisting('server/services/castSessionService.js');
+    let discoveries = 0;
+    const service = createCastSessionService({
+        publicBaseUrl: 'http://192.168.1.40:3000',
+        adapter: {
+            discover: async () => { discoveries += 1; return [{ id: 'cast-1', type: 'google_cast', ready: true }]; },
+            startSession: async () => ({ sessionId: 'session-1' })
+        },
+        mediaUrlSigner: { sign: () => '/api/cast/media/id?token=abc' },
+        discoveryTtlMs: 60_000
+    });
+    await assert.rejects(() => service.startSession({
+        deviceId: 'cast-1', mediaPath: '/api/proxy/stream?url=http%3A%2F%2Fprovider.test%2Flive.m3u8'
+    }), /upstream|allowed/i);
+    await assert.rejects(() => service.startSession({
+        deviceId: 'cast-1', mediaPath: '/api/transcode/session-1/stream.m3u8', unexpected: true
+    }), /unknown/i);
+    await assert.rejects(() => service.startSession({
+        deviceId: 'x'.repeat(129), mediaPath: '/api/transcode/session-1/stream.m3u8'
+    }), /deviceId/i);
+    await service.getDevices();
+    await service.getDevices();
+    assert.equal(discoveries, 1, 'device discovery should be cached within its TTL');
+});
+
+test('cast command validation rejects malformed seek, volume and unknown fields', () => {
+    const { validateCommandBody } = requireExisting('server/routes/cast.js');
+    assert.throws(() => validateCommandBody('seek', { currentTime: -1 }), /greater than or equal/i);
+    assert.throws(() => validateCommandBody('seek', { currentTime: 5, extra: true }), /requires currentTime/i);
+    assert.throws(() => validateCommandBody('volume', { level: 1.1 }), /between 0 and 1/i);
+    assert.throws(() => validateCommandBody('volume', { muted: 'yes' }), /boolean/i);
+    assert.throws(() => validateCommandBody('play', { unexpected: true }), /does not accept/i);
+    assert.deepEqual(validateCommandBody('seek', { currentTime: 12 }), { currentTime: 12 });
+    assert.deepEqual(validateCommandBody('volume', { level: 0.5, muted: false }), { level: 0.5, muted: false });
+});
+
+test('Google Cast adapter discovers mDNS devices and loads media through Default Media Receiver', async () => {
+    const { createGoogleCastAdapter } = requireExisting('server/services/googleCastAdapter.js');
+    const calls = [];
+    let browserStopped = false;
+    let bonjourDestroyed = false;
+    class FakeBonjour {
+        find(options, onup) {
+            calls.push(['find', options]);
+            onup({
+                name: 'Living Room', fqdn: 'living-room._googlecast._tcp.local', port: 8009,
+                addresses: ['192.168.1.55'], txt: { id: 'cast-1', fn: 'Living Room TV', md: 'Chromecast' }
+            });
+            return { on() {}, stop() { browserStopped = true; } };
+        }
+        destroy() { bonjourDestroyed = true; }
+    }
+    const controller = {
+        load: async payload => {
+            calls.push(['load', payload]);
+            return { unwrapAndThrow: () => ({ playerState: 'PLAYING', currentTime: 0 }) };
+        },
+        stop: async () => ({ unwrapAndThrow: () => ({ playerState: 'IDLE' }) }),
+        dispose: () => calls.push(['dispose'])
+    };
+    const client = { close: () => calls.push(['close']) };
+    const castClient = {
+        connect: async options => { calls.push(['connect', options]); return client; },
+        DefaultMediaApp: {
+            launchAndJoin: async request => {
+                calls.push(['launch', request]);
+                return { unwrapAndThrow: () => controller };
+            }
+        }
+    };
+    const adapter = createGoogleCastAdapter({
+        dependencies: { Bonjour: FakeBonjour, castClient },
+        discoveryTimeoutMs: 5
+    });
+
+    const devices = await adapter.discover();
+    assert.deepEqual(devices, [{
+        id: 'cast-1', name: 'Living Room TV', type: 'google_cast', ready: true,
+        host: '192.168.1.55', port: 8009, model: 'Chromecast'
+    }]);
+    assert.equal(browserStopped, true);
+    assert.equal(bonjourDestroyed, true);
+
+    const session = await adapter.startSession({
+        device: devices[0], mediaUrl: 'http://192.168.1.40:3000/api/cast/media/id?token=signed', media: {}
+    });
+    assert.equal(session.state, 'playing');
+    assert.deepEqual(calls.find(call => call[0] === 'connect')[1], { host: '192.168.1.55', port: 8009, timeout: 8000 });
+    const load = calls.find(call => call[0] === 'load')[1];
+    assert.equal(load.media.contentType, 'application/vnd.apple.mpegurl');
+    assert.equal(load.media.streamType, 'LIVE');
+    await adapter.stopSession(session);
+    assert.ok(calls.some(call => call[0] === 'dispose'));
+    assert.ok(calls.some(call => call[0] === 'close'));
+});
+
+test('frontend exposes server cast API helpers and a device picker with honest Fire TV handling', async () => {
+    const dom = new JSDOM(`
+        <button id="player-cast" title="Play on a device" aria-label="Play on a device"></button>
+        <button id="watch-cast" title="Play on a device" aria-label="Play on a device"></button>
+    `, { url: 'http://nodecast.test/', runScripts: 'outside-only' });
+    const requests = [];
+    dom.window.localStorage.setItem('authToken', 'token-1');
+    dom.window.fetch = async (url, options = {}) => {
+        requests.push({ url, options });
+        if (url === '/api/cast/devices') {
+            return {
+                ok: true,
+                headers: { get: () => 'application/json' },
+                json: async () => ({
+                    devices: [
+                        { id: 'cast-1', type: 'google_cast', name: 'Chromecast', ready: true },
+                        { id: 'atv-1', type: 'android_tv_cast', name: 'Android TV', ready: true },
+                        { id: 'fire-1', type: 'fire_tv', name: 'Fire TV', ready: false, status: 'receiver_required' }
+                    ]
+                })
+            };
+        }
+        return { ok: true, headers: { get: () => 'application/json' }, json: async () => ({ sessionId: 'session-1' }) };
+    };
+
+    dom.window.eval(fs.readFileSync(path.join(root, 'public', 'js', 'api.js'), 'utf8'));
+    assert.ok(dom.window.API.cast, 'API.cast should expose server-driven cast helpers');
+    assert.equal(typeof dom.window.API.cast.getDevices, 'function');
+    assert.equal(typeof dom.window.API.cast.refreshDevices, 'function');
+    assert.equal(typeof dom.window.API.cast.startSession, 'function');
+
+    const html = fs.readFileSync(path.join(root, 'public', 'index.html'), 'utf8');
+    assert.match(html, /id="cast-device-dialog"/, 'cast button should open a device picker dialog');
+    assert.match(html, /id="cast-device-list"/, 'cast UI should render a device list');
+
+    const { ServerCastDevicePicker } = requireExisting('public/js/services/serverCastDevicePicker.js');
+    const picker = new ServerCastDevicePicker({
+        document: dom.window.document,
+        api: dom.window.API.cast,
+        nativeCastService: { state: { available: true }, prompt: async () => {} },
+        mediaUrlProvider: () => '/api/transcode/session-safe/stream.m3u8'
+    });
+
+    await picker.open();
+    assert.equal(requests[0].url, '/api/cast/devices');
+    assert.match(dom.window.document.body.textContent, /Chromecast/);
+    assert.match(dom.window.document.body.textContent, /Android TV/);
+    assert.match(dom.window.document.body.textContent, /Receiver required/);
+    assert.match(dom.window.document.body.textContent, /Use browser device picker/);
+
+    const fireButton = dom.window.document.querySelector('[data-device-id="fire-1"]');
+    assert.ok(fireButton.disabled, 'Fire TV without a receiver app should not be connectable');
+    fireButton.click();
+    assert.equal(requests.filter(request => request.url === '/api/cast/sessions').length, 0);
+
+    dom.window.document.querySelector('[data-device-id="cast-1"]').click();
+    assert.equal(requests.at(-1).url, '/api/cast/sessions');
+    assert.equal(JSON.parse(requests.at(-1).options.body).deviceId, 'cast-1');
+});
+
+test('frontend does not create a server cast session for proxy, external or otherwise unsafe media paths', async () => {
+    const unsafePaths = [
+        '/api/proxy/stream?url=http%3A%2F%2Fexample.test%2Flive.m3u8',
+        'https://example.test/live.m3u8',
+        '/api/transcode/session-safe/stream.m3u8?token=unsafe'
+    ];
+
+    for (const mediaPath of unsafePaths) {
+        const dom = new JSDOM('', { url: 'http://nodecast.test/' });
+        let sessionPosts = 0;
+        const { ServerCastDevicePicker } = requireExisting('public/js/services/serverCastDevicePicker.js');
+        const picker = new ServerCastDevicePicker({
+            document: dom.window.document,
+            api: {
+                getDevices: async () => ({ devices: [] }),
+                startSession: async () => { sessionPosts += 1; }
+            },
+            nativeCastService: { state: { available: true }, prompt: async () => {} },
+            mediaUrlProvider: () => mediaPath
+        });
+
+        await picker.connect('cast-1');
+        assert.equal(sessionPosts, 0, `${mediaPath} must not create a cast session`);
+        assert.match(
+            dom.window.document.getElementById('cast-device-message').textContent,
+            /not ready for server casting yet.*browser device picker/i
+        );
+    }
+});