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fix(plex): start hls.js at position 0 for the transcode/remux HLS session

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Our HLS is a growing EVENT playlist with no ENDLIST, which hls.js reads as
LIVE. Its default startPosition (-1) then starts at the live edge and hugs it
(no forward buffer → rebuffer spinners), and on a resume/seek session the
segments' absolute PTS (-copyts, offset by the server's -ss) don't line up
with the live-edge timeline → 0 fragments load → permanent stall. The
seek-restart model makes fragment 0 the requested content position, so start
VOD-style at 0 and buffer forward. Fixes the transcode playback stall/rebuffer
found in 0.78.2 UAT.
This commit is contained in:
peter
2026-08-30 20:09:00 +02:00
parent 66132b6dda
commit 92adb593c8
1 changed files with 9 additions and 1 deletions
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frontend/src/components/PlexPlayer.tsx
+9 -1
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@@ -261,7 +261,15 @@ export default function PlexPlayer({ itemId, onClose, queue }: Props) {
hlsRef.current = null;
}
if (sess.mode === "hls" && Hls.isSupported()) {
const hls = new Hls({ maxBufferLength: 30, enableWorker: true });
// startPosition: 0 — our HLS is a growing EVENT playlist with no ENDLIST (see _HLS_TAIL in
// stream.py), which hls.js classifies as LIVE. Its default (startPosition: -1) then starts
// playback at the live edge and hugs it, so it never builds a forward buffer (rebuffer
// spinners), and on a resume/seek session the segments' absolute PTS (-copyts, offset by the
// server's -ss) don't line up with the live-edge timeline → 0 fragments load → permanent
// stall. But the seek-restart model means fragment 0 IS the requested content position
// (`?t=` positioned the server ffmpeg there), so we always want to start VOD-style at 0 and
// buffer forward up to maxBufferLength. Applies to remux + transcode alike (both use copyts).
const hls = new Hls({ maxBufferLength: 30, enableWorker: true, startPosition: 0 });
hlsRef.current = hls;
hls.loadSource(`${sess.url}?t=${Math.floor(startAt)}`);
hls.attachMedia(video);