On a Fire TV whose audio HAL stopped taking audio (#2255 investigation),
mpv playback froze silently: the AudioTrack writer blocked forever and
nothing surfaced. The native side now gives up after one bounded recovery
and ends the file with MPV_ERROR_AO_INIT_FAILED; this carries that verdict
to the UI.
The JNI bridge forwards mpv_event_end_file.error (previously discarded),
MpvEvent.EndFile exposes it as a typed MpvError, and
MpvEndFileDiagnostics tags an AO failure with the audio-output-failed
cause. The Dart failure policy treats that cause as terminal before any
HTTP diagnosis or the live-TV ladder, since re-opening the stream would
only run the same dead output again, and the player shows localized
guidance instead of raw log text. Progress is preserved; nothing is
marked completed.
Requires the mpv-build revision carrying the audiotrack stall watchdog;
until the lock is bumped, the new cause can only come from audio-only
media whose output fails to open.
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