The 8.1.0 downgrade broke the build and the audio export: 8.1.0's
typed video encoder has no set_color_primaries /
set_color_transfer_characteristic, and its older audio path sent
near-NaN samples into the AAC encoder (transcode_mp4 and the oak-task
export test both failed). ffmpeg-next 9.0.0 supports ffmpeg_8_0/8_1
(the vcpkg pin of 8.1.2#3 is unaffected) and carries ffmpeg_9_0 cfg
branches for the day FFmpeg 9 lands.
Mike-Solar
23174512c0