Plex Live TV lost DVB subtitles when 2.10 moved the live path to HLS
(#1983): the transcode starts with subtitles=none, which drops a
tuner's bitmap subtitle streams from the output entirely - unlike
in-band CEA captions, they are separate elementary streams.
The tune response now surfaces the part's embedded bitmap subtitle
streams as selectable tracks in the player's subtitle menu. Picking one
points the part's server-side selection at that stream and rebuilds the
live transcode with subtitles=burn, preserving the time-shift position.
Off stays the default so tuner captions are never auto-burned (#1590),
and channels without bitmap streams keep the native track list. The
selection survives stream recovery by re-mapping onto the re-tuned
session's streams and resets on channel zap. Jellyfin live sessions
record subtitle selection as intentionally unsupported: their one
negotiated URL has no rebuild to deliver it through.
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