When ExoPlayer selected no audio track, the recovery forced group 0 /
track 0 unconditionally. But the most likely reason nothing was selected
is that this very track cannot be decoded on this device, so the override
reinstated the silence it was meant to fix.
Scan the groups for the first isTrackSupported track and override to
that. Also clear setTrackTypeDisabled(TRACK_TYPE_AUDIO), since audio may
equally have been off at the type level, which an override alone does not
undo. When no group holds a supported track, log it as an error — the
server was expected to transcode — instead of leaving a silent video with
no explanation in the log.
Verified by compiling :app:compileArm64DebugKotlin. Not unit-tested: this
tree has no Kotlin test source set, as noted in the previous commit.
dtourolle
7b531a40be