refactor: simplify initialization wait logic by removing keepalive packet handling (Fixes #1280)

CHANGELOG.md

@@ -38,6 +38,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- **Null TS keepalive packets during channel initialization caused Emby (and Jellyfin) to force a deinterlace transcode or fail playback entirely.** While waiting for a channel to become ready, the generator sent a null TS packet (PID `0x1FFF`) every 0.5 s to keep the HTTP connection alive. Emby probes the initial bytes of the response via ffprobe; receiving a null packet instead of real stream data produced incorrect codec metadata and triggered a forced transcode. The null-packet yield has been replaced with a plain `gevent.sleep(0.1)`. (Fixes #1280)
 - **VOD proxy stream URLs survive M3U import refresh cycles.** When `process_movie_batch` / `process_series_batch` create duplicate content records during a refresh, existing `M3UMovieRelation` / `M3UEpisodeRelation` rows are repointed at the new records, orphaning the old UUIDs. External players (Emby, Jellyfin, ChannelsDVR) that cached `.strm` URLs with the dead UUID would then 404 even though the same request carried a stable `stream_id` that maps to an active relation. The proxy now falls back to stream_id resolution when the UUID lookup misses, using strictest-match-first logic (account-scoped relation preferred, then highest-priority account). A `[STREAMID-FALLBACK]` WARNING log keeps the underlying import churn. — Thanks [@R3XCHRIS](https://github.com/R3XCHRIS)
 - **IP lookup no longer blocks the settings page load.** The `environment` endpoint previously made up to three sequential HTTP calls (ipify, ipapi.co, ip-api.com) with 5s timeouts each, blocking the page for up to 15s if any were unreachable. The lookups now run in a background thread on first request and results are cached in Redis for 1 hour, so the endpoint returns immediately on every call. — Thanks [@sethwv](https://github.com/sethwv)
 - **Authenticated users were not identified in VOD connection cards and stream events when streaming via the web player.** The VOD proxy now accepts a JWT via a `?token=` query parameter so browser `<video>` elements (which cannot send `Authorization` headers) can authenticate. The token is read on the initial request, the resolved user ID is stored in Redis, then retrieved on the actual streaming request after the session redirect. Previously the redirect discarded auth context and all JWT-authenticated VOD sessions were tracked as anonymous. (Fixes #1224)

apps/proxy/live_proxy/output/ts/generator.py

@@ -140,11 +140,8 @@ class StreamGenerator:
             self._cleanup()
 
     def _wait_for_initialization(self):
-        """Wait for channel initialization to complete, sending keepalive packets."""
         initialization_start = time.time()
         max_init_wait = ConfigHelper.client_wait_timeout()
-        keepalive_interval = 0.5
-        last_keepalive = 0
         proxy_server = ProxyServer.get_instance()
 
         while time.time() - initialization_start < max_init_wait:
@@ -169,15 +166,7 @@ class StreamGenerator:
                     yield create_ts_packet('error', "Error: Channel is stopping")
                     return False
 
-            # Send null packets to keep the connection alive during initialization.
-            if time.time() - last_keepalive >= keepalive_interval:
-                logger.debug(f"[{self.client_id}] Sending keepalive during initialization")
-                keepalive_data = create_ts_packet('null')
-                yield keepalive_data
-                self.bytes_sent += len(keepalive_data)
-                last_keepalive = time.time()
-            else:
-                gevent.sleep(0.1)
+            gevent.sleep(0.1)
 
         logger.warning(f"[{self.client_id}] Timed out waiting for initialization")
         yield create_ts_packet('error', "Error: Initialization timeout")