Since 2.18.0 no Jellyfin Live TV channel plays: opening one fails with
"Could not start the live channel", and switching channel inside the player
does nothing at all. Negotiating video transcodes as fMP4 (#2131) left the
device profile with no MPEG-TS entry, and Jellyfin discards every non-ts
transcoding profile for a live source whose tuner sets
UseMostCompatibleTranscodingProfile - hardcoded for every HDHomeRun host, the
default for M3U ones - so the negotiation came back with no HLS URL at all.
The device profile now sends a ts profile alongside the fMP4 one, listed
second, the way jellyfin-web does. Both of its codec lists are strict subsets
of the fMP4 entry's and the server ranks profiles with a stable sort, so ts
can only win where fMP4 has been filtered out; VOD keeps negotiating fMP4.
flac and truehd are absent because TS cannot carry them, av1 because that is
the gap fMP4 exists to fill.
Live TV also stops being unconditionally transcode-only. It now reads the same
saved quality preset the library path does: Original asks for direct play and
sends no bitrate ceiling, so a channel the server can hand over untouched no
longer costs a GPU encode session per viewer, and a capped preset transcodes at
that ceiling. A direct-play session whose stream dies re-negotiates a forced
transcode instead of re-opening a URL the server will not serve.
Two smaller holes on the same path: a negotiation that bailed out left the live
stream AutoOpenLiveStream had already opened running, because no playback
session existed to ever stop-report it - a few failed tunes could saturate a
provider's connection budget - and a channel switch that failed to start showed
no message at all.
close#2198
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