Am Do., 7. Nov. 2019 um 00:09 Uhr schrieb Carl Eugen Hoyos <ceffm...@gmail.com>: > > 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.
This mail leads to a long thread: http://mplayerhq.hu/pipermail/ffmpeg-devel/2013-May/143854.html In the end a file tools/ffhash.c was created to compare hash implementation speeds. 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".
