Add Enigma2/OpenWebif M3U support: program mapping and zap-before-streaming

- Parse #EXTVLCOPT:program=N from M3U playlists (both full and streaming
  parsers, per channel, strict mode) and store it on playlist items
- Transcode multi-program MPEG-TS streams by mapping only the selected
  program's first video and audio stream (DVB teletext/subtitles in the
  program otherwise make FFmpeg fail to produce HLS)
- Optional per-source "zap before streaming" with configurable delay:
  POST /api/openwebif/zap takes sourceId + streamId, requires an enabled,
  zap-enabled M3U source containing that channel, derives the receiver
  from the configured source URL (never from the client), validates the
  Enigma2 service reference, uses a timeout without redirects and does
  not echo the receiver response
- Live TV: Stop button, and stop playback when leaving the page
- Tests for ordinary and program-tagged playlists and the zap endpoint

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/services/m3uParser.js

@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * M3U Playlist Parser (Streaming)
  * Parses EXTM3U format playlists and extracts channel information line-by-line
@@ -88,6 +90,7 @@ async function parse(input) {
     const groupsSet = new Set();
     let currentInfo = null;
     let currentGroup = null;
+    let currentVlcProgram = null;
 
     let lines;
 
@@ -121,6 +124,11 @@ async function parse(input) {
             if (currentInfo) {
                 currentInfo.groupTitle = currentGroup;
             }
+        } else if (trimmed.startsWith('#EXTVLCOPT:program=')) {
+            currentVlcProgram = trimmed.split('=')[1]?.trim() || null;
+            if (currentInfo) {
+                currentInfo.program = currentVlcProgram;
+            }
         } else if (!trimmed.startsWith('#')) {
             // This is a stream URL
             if (currentInfo) {
@@ -132,9 +140,11 @@ async function parse(input) {
                     ...currentInfo,
                     id: stableId,
                     url: trimmed,
+                    program: currentVlcProgram,
                     groupTitle: groupTitle
                 });
                 currentInfo = null;
+                currentVlcProgram = null;
             }
         }
     }
@@ -187,6 +197,7 @@ async function* parseStreaming(input, batchSize = 500) {
     const groupsSet = new Set();
     let currentInfo = null;
     let currentGroup = null;
+    let currentVlcProgram = null;
     let batch = [];
 
     let lines;
@@ -216,6 +227,11 @@ async function* parseStreaming(input, batchSize = 500) {
             if (currentInfo) {
                 currentInfo.groupTitle = currentGroup;
             }
+        } else if (trimmed.startsWith('#EXTVLCOPT:program=')) {
+            currentVlcProgram = trimmed.split('=')[1]?.trim() || null;
+            if (currentInfo) {
+                currentInfo.program = currentVlcProgram;
+            }
         } else if (!trimmed.startsWith('#')) {
             if (currentInfo) {
                 const groupTitle = currentInfo.groupTitle || currentGroup || 'Uncategorized';
@@ -225,9 +241,11 @@ async function* parseStreaming(input, batchSize = 500) {
                     ...currentInfo,
                     id: stableId,
                     url: trimmed,
+                    program: currentVlcProgram,
                     groupTitle: groupTitle
                 });
                 currentInfo = null;
+                currentVlcProgram = null;
 
                 // Yield batch when full
                 if (batch.length >= batchSize) {

server/services/m3uXtreamAdapter.js

@@ -58,6 +58,7 @@ class M3uXtreamAdapter {
                 name,
                 stream_icon,
                 stream_url,
+                program,
                 category_id,
                 added_at,
                 data
@@ -92,6 +93,7 @@ class M3uXtreamAdapter {
                 added: row.added_at,
                 // M3U-specific: direct stream URL (Xtream builds URLs from credentials)
                 stream_url: row.stream_url,
+                program: row.program || extra.program || null,
                 // Include extra fields from parser (tvgId, etc.)
                 epg_channel_id: extra.tvgId || null,
                 ...extra

server/services/syncService.js

@@ -278,14 +278,16 @@ class SyncService {
         const stmt = db.prepare(`
             INSERT INTO playlist_items (
                 id, source_id, item_id, type, name, category_id, 
-                stream_icon, stream_url, container_extension, 
+                stream_icon, stream_url, program, container_extension, 
                 rating, year, added_at, data
             )
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             ON CONFLICT(id) DO UPDATE SET
                 name = excluded.name,
                 category_id = excluded.category_id,
                 stream_icon = excluded.stream_icon,
+                stream_url = excluded.stream_url,
+                program = excluded.program,
                 container_extension = excluded.container_extension,
                 data = excluded.data
         `);
@@ -332,6 +334,7 @@ class SyncService {
                     String(catId),
                     icon,
                     null, // Direct URL not stored for Xtream usually, built on fly
+                    item.program || null,
                     container,
                     rating,
                     year,
@@ -641,6 +644,7 @@ class SyncService {
                 stream_icon: ch.tvgLogo,
                 stream_url: ch.url,
                 tvgId: ch.tvgId || null,
+                program: ch.program || null,
             }));
 
             // Save this batch immediately (skip purge - we'll do it at the end)

server/services/transcodeSession.js

@@ -230,8 +230,15 @@ class TranscodeSession extends EventEmitter {
         }
 
         // Map streams
-        args.push('-map', '0:v:0');
-        args.push('-map', '0:a:0?');
+        // Only map video/audio from the program: mapping the whole program pulls in
+        // DVB teletext/subtitle streams, which can't be encoded to HLS and kill FFmpeg
+        if (this.options.program) {
+            args.push('-map', `0:p:${this.options.program}:v:0`);
+            args.push('-map', `0:p:${this.options.program}:a:0?`);
+        } else {
+            args.push('-map', '0:v:0');
+            args.push('-map', '0:a:0?');
+        }
 
         // Add video encoder and filters based on selected encoder OR copy
         if (videoMode === 'copy') {