A Plex transcode session always starts producing at zero: the decision
request never sent offset=, so any non-zero open - resuming a
transcoded title, or switching from Direct Play to a transcoded
quality mid-playback - opened a session whose produced window begins
at the start of the file and seeked it. mpv immediately requests a
segment the transcoder has not produced, PMS answers 404 for it and
every subsequent segment, and playback buffers forever.
Send offset=<seconds> (6dp) with the decision and start request - the
view offset on initial open, the resolved resume position on every
in-place reload - so the session begins producing at the position the
player consumes first. The playlist timeline is unchanged: an offset
session's media playlist still covers the full title from segment
zero, so the player keeps opening with start: at the resume position
and in-stream seeks work as before.
Before a native player opens an offset playlist, waitForTranscodeReady
walks the master playlist, the media playlist, and the segment
containing the offset, because PMS can publish a manifest before that
segment is fetchable and mpv treats the 404 as an HLS error. The probe
is best-effort: it never fails an open, hands off immediately on HTTP
500 (on the response and exception paths alike) so the server-limit
dialog stays prompt, stops on cancellation, skips itself when the
playlist durations never reach the offset, and stays out of the
endpoint-failover cascade. In-place reloads resolve the replacement
source only after the old stop report has gone out, so Plex cannot use
that stop to terminate the replacement transcode.
close#1840
Episode advance carried live player state, so the viewer's choice only
survived while every episode could serve it: one episode without the
picked audio or subtitle fell back, and the fallback became the carry for
the rest of the session. The screen now keeps the last explicit audio,
subtitle, and secondary-subtitle choices for its lifetime; automatic
outcomes never overwrite them, so the choice retries on every following
episode and reattaches as soon as a catalog can serve it again.
Audio catches up with the subtitle carry from #1785. The old matcher
required raw language equality (a 'sv' pick never found a 'swe' row) and
otherwise took the first same-language track, flipping a commentary or
alternate-mix pick back to the main mix on every episode. Audio now uses
the same evidence bands as subtitles: bridged language parity is
authoritative, a unique title match vouches for untagged tracks, codec
and channel-count parity only break ties, and an ambiguous catalog
declines to the server's own choice instead of guessing. The synthesized
source descriptor also prefers the row's own title over the display title
that collapses to the bare language.
Episode advance previously sent no audio hint to negotiation at all, so a
transcode baked in the server's default audio no matter what was playing.
Both backends now resolve the carried semantics against the new episode's
streams: Jellyfin sends the resolved AudioStreamIndex, Plex feeds the
transcode decision, an explicit per-part stream id always wins, and a
failed match falls back to the server's pick.
close#1785
* fix(plex): show PGS subtitles when transcoding
Bitmap subtitles (PGS/VOBSUB) disappeared from the menu while transcoding on Plex, leaving only "Off". The MKV transcode already supports them, so embed them in the stream like text subs. Now they show up and can be turned on.
* fix(plex): give bitmap subtitle codecs the right sidecar extension
getSubtitleExtension fell back to .srt for vobsub, pgssub and dvb subs. Map them to .sub/.sup so it stays consistent with isImageSubtitleCodec and any sidecar URL or download uses the correct extension.
toluLikesToCode