⚠Anki Desktop can't decode H.264/MP4 (or MKV/AVI) inside a card — you get a black box. Convert the movie to WebM once, then load that file here:
ffmpeg -i movie.mp4 -c:v libvpx-vp9 -b:v 1M -row-mt 1 -cpu-used 4 -c:a libopus movie.webm
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