Thanks for the infos!
And "yes": My PHP/Python examples were not related to FFmpeg, but this
discovery led me to become curious how FFmpeg does it - and therefore
ask this question :)
Will read the Giorgio-Thread and maybe return with reproducible
(commandline + uncut console output) question scenarios.
Thank you very much!
Pb
On 07/11/2019 00:21, Carl Eugen Hoyos wrote:
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
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