Hi Jerome On Wed, Oct 16, 2024 at 10:29:18PM +0200, Jerome Martinez wrote: > Le 16/10/2024 à 21:51, Michael Niedermayer a écrit : > > did you try qtable 1 ? strangely it performed better for the file i used > > compression wise > > Updated with latest code (in practice, no change in previous values): > 0,037x 0,471 No patch > 0,051x 0,491 bitfield > 0,046x 0,489 rangecoder > 0,046x 0,486 rangecoder qtable=1 > > qtable=1 helps but still not enough for being interesting compared to the > bitfield version. > > > also i cleaned the code up a bit and reposted, some of the code was > > not exactly optimized > > > > here the old "bitfield" > > real 0m5.545s > > real 0m5.655s > > real 0m5.643s > > > > vs. just now posted: > > real 0m5.407s > > real 0m5.393s > > real 0m5.404s > > Even more interesting to keep the bitfield version rather than the range > coder!
what are you testing? the new code is faster than the old code. There is something not right here, the range coder based implementation i posted now is 5% faster then the range coder based one i posted earlier today thats overall speed meassured with "time ./ffmpeg" if you see no difference there is something fishy i simply tested this: ./ffmpeg -i rawsamples/16/01.dpx -threads 1 -c:v ffv1 -context 1 -coder 1 -strict -2 -level 4 -rawlsb 4 -y /tmp/speedtest4.nut It uses 1 thread as the speed with more threads was very unstable between runs and we want to know how fast ffv1 is not how multithreading behaves > > FYI I test on 2 different sets of 2 seconds of real content, on SSD, 1 min > of encoding each so result is stable, unfortunately I don't have more > content but I try to have more. can this content be downloaded somewhere ? thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Modern terrorism, a quick summary: Need oil, start war with country that has oil, kill hundread thousand in war. Let country fall into chaos, be surprised about raise of fundamantalists. Drop more bombs, kill more people, be surprised about them taking revenge and drop even more bombs and strip your own citizens of their rights and freedoms. to be continued
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