On 10/26/22 15:13, Michael Niedermayer wrote:
CRC is not a random pick for error detection, CRC has specfic properties like for example that whole classes of errors are guranteed to be detected a random hash will not gurantee that. for example a properly designed 8bit CRC will detect every single 1 byte change always. a 8 bit hash like taking 8 bits from SHA256 will detect only 255 out of 256 1 byte changes
I'm a bit confused here, aren't there only 255 one-byte changes in the first place? The 256th is when the byte remains unchanged.
That aside I don't believe xxhash is designed to be an error-correcting hash, but rather one that's used for fast database lookup.
- Leo Izen (thebombzen) _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
