tor 2023-01-05 klockan 11:41 +0100 skrev Dmitrii Ovchinnikov: > From: Dmitrii Ovchinnikov <ovchinnikov.dmit...@gmail.com> > > This change improves the performance and multicore > scalability of the vp9 codec for streaming single-pass encoded > videos. The > current thread limit for ffmpeg codecs is 16 (MAX_AUTO_THREADS in > pthread_internal.h) due to a limitation in H.264 codec that prevents > more > than 16 threads being used.
This limitation should be restricted to H.264 IMO, not applied to all codecs wholesale. I ran into this issue with jpeg2000dec. > > Increasing the thread limit to 64 for vp9 improves > the performance for encoding 4K raw videos for streaming by up to 47% > compared to 16 threads, and from 20-30% for 32 threads, with the same > quality > as measured by the VMAF score. > > Did not need to add a check for limit in libvpx as it is already > present > in libvpx/vp9/vp9_cx_iface.c: > RANGE_CHECK_HI(cfg, g_threads, 64); Perhaps we should have a table of known max number of threads per codec? /Tomas _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
