Dolby Vision profile 7 titles (UHD Blu-ray remuxes, typically TrueHD or
DTS-HD MA) never showed a frame on the Fire TV Stick 4K Max 2nd gen with the
mpv backend: the spinner stayed forever while audio came up. Profile 8.1
titles carrying HDR10+ on the same device went fully black, controls
included, with audio playing.
Both are the FFmpeg mediacodec DV packet filter. It emitted every rewritten
access unit with a five-byte "00 00 00 00 01" start code - the leading zero
was copied once as head bytes and again as part of the first NAL region -
and MediaTek's VPU rejects such units ("H265_decode invalid NALU"), so the
profile 7 conversion and strip paths both produced nothing. And the filter
never dropped in-band HDR10+ SEI, which these chipsets cannot take next to
the RPU on the native DV decoder (#1296 on the ExoPlayer path).
Move the native pin to edde746/mpv-build@0ad6388c, which counts that zero
once and strips the ST 2094-40 SEI whenever a video/dolby-vision decoder is
selected. Verified on an AFTKRT with the published armeabi-v7a asset: a
P7.6 remux sample decodes on both the HEVC (strip) and DVHE.STH (convert)
paths with no VPU errors, and a P8.1 + HDR10+ remux plays on the DV decoder
with a single output-format change. Apple, Linux and Windows assets are
unchanged (their content keys did not move).
close#2176
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