[FFmpeg-devel] [PATCH 2/5] fate: avoid framemd5, use framecrc its faster

Nicolas George nicolas.george at normalesup.org
Thu May 9 15:16:12 CEST 2013

Le decadi 20 floréal, an CCXXI, compn a écrit :
> anyone check if our md5sum implementation was the fastest?

Very good point. It is not:

ffmpeg -f md5:  34.61s user 0.88s system
ffmpeg -f null: 16.69s user 0.92s system
md5sum (GNU):    6.69s user 0.80s system
openssl md5:     5.82s user 0.93s system

On a 1.657 Go file and Atom D525 1.80GHz.

So lavu's MD5 is somewhere between 2.5 and 5 times slower than GNU's, which
itself is 15% slower than OpenSSL. This is not a very careful benchmark, but
I believe it is enough to say that there is a lot of room for improvement in


  Nicolas George
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