On Wed, Nov 25, 2015 at 2:47 PM, D <dcmhoybdp...@web.de> wrote: > Continuing and splitting up the problem which I have here: > https://ffmpeg.org/pipermail/ffmpeg-user/2015-November/029274.html. > The problem is that libx264 utilizes all 4 cores almost to the 400% ($ top), > as it should be, but when using libvpx-vp9, it's only ~250%. > > $ cd ffmpeg-git-20151124-64bit-static > > No Problem: > Almost 100% on all 4 cores if I use: > $ ./ffmpeg -i a.mp4 -c:v libx264 -crf 23 -c:a libvorbis b.mp4 > > Problem: > Only 1 core used, not all 4 cores like with libx264, but also on 100% if I > use: > $ ./ffmpeg -i a.mp4 -c:v libvpx-vp9 -crf 23 -c:a libvorbis b.webm > > Problem: > And trying to use all 4 cores, although all 4 cores are used now, it's only > on ~60-75% utilization (~250% in top): > $ ./ffmpeg -i a.mp4 -c:v libvpx-vp9 -crf 23 -cpu-used 4 -threads 4 -c:a > libvorbis b.webm > (changing -cpu-used and -threads higher than 4 values was neither faster > nor slower). > > What do you think? (See already mentioned suggestions in 029274.html thread. > They unfortunately didn't help.) > John, the maintainer of the "Linux Static Builds" > (https://ffmpeg.org/download.html), says it might be due to libvpx-vp9 not > being optimized yet and maybe someone else has an idea. > Can anyone try these libvpx-vp9 commands and say how many % in $ top are > used? > My OS is Ubuntu 15.04 but I don't think this is the reason. My CPU has no HT > support, only 4 real cores (84W TDP Haswell).
Do you get the same results using vpxenc and the appropriate flags? Cheers Tom _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user