4:4:4 (High profile) AV1 played as green or black video on Android TV
devices with AV1 hardware decoders: MediaCodec defines no profile
constants beyond Main, but decoders like the Fire Stick 4K Max (MTK)
and Amlogic C2 accept the stream at configure time and emit garbage or
nothing, so no error ever reached the player and no fallback ran.
libmpv v1.2.2 carries an FFmpeg patch that reads seq_profile from the
bitstream at av1_mediacodec init and refuses High/Professional streams,
letting mpv's hwdec probing fall through to dav1d software decoding.
Main-profile AV1 keeps hardware decoding.
close#2194
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