On Wed, Oct 16, 2024 at 10:53:37PM +0200, Michael Niedermayer wrote: > 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
compiler was this: gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.2) thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Freedom in capitalist society always remains about the same as it was in ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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