The negotiation asks for no subtitle stream (DR-176), but when PlaybackInfo
answers with a TranscodingUrl we played that URL verbatim — and the server
built it from its own subtitle verdict. Jellyfin's StreamInfo.ToUrl appends
SubtitleStreamIndex and SubtitleMethod whenever it picked a track, so the
burn-in we had just declined came straight back through the URL, turning a
remux into a full frame-by-frame re-encode.
Live TV never declined it at all: open_live_stream sent no index, so the
server applied the channel's default track, and broadcast subtitles are DVB
bitmaps that NormalizeSubtitleEmbed converts to burn-in on sight.
without_server_chosen_subtitle() drops SubtitleStreamIndex, SubtitleMethod,
SubtitleCodec and alwaysBurnInSubtitleWhenTranscoding from any URL the server
built — matched case-insensitively, as Jellyfin binds query keys — and
re-appends the -1 sentinel, because an absent index is not "none", it is
"you choose". Applied at both adoption points, plus the sentinel in the
live-stream negotiation body and its fallback URL.
dtourolle
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