Am Mi., 6. Nov. 2019 um 23:40 Uhr schrieb Peter B. <p...@das-werkstatt.com>:
> Hashing for fixity and transfer-checking seems to be quite a bottleneck > for archiving big video/film files for archiving. > > Therefore I was considering if using "simpler" algorithms (like CRC > instead of SHA256) could speed up the process. > I was surprised that e.g. MD5 vs CRC in Python as well as PHP > seemed to be equally "fast". But this is not related to FFmpeg, no? > So I was wondering: > Does FFmpeg have/do any speed optimization for hashing functionality > (framemd5, hash muxer, etc) in its code? Some of Giorgio's commits were meant to increase hash function speed: http://git.videolan.org/?p=ffmpeg.git;a=search;s=vazzana;st=author There is an email with a script to compare the implementation's speeds, I don't know when it was sent to the development mailing list though. > I've noticed, for example that "-f hash" for MD5 uses only half, SHA256 > just a quarter of my CPU. Command line and complete, uncut console output missing. Carl Eugen _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
