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Old 3rd May 2019, 09:03   #18  |  Link
excellentswordfight
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Join Date: Jul 2017
Posts: 322
Quote:
Originally Posted by TEB View Post
Same issue here:

/ffmpeg -loglevel verbose -i 35543_1080p_25.mov -vf scale=960:540 -pix_fmt yuv420p10le -codec:v libx265 -x265-params keyint=100:min-keyint=200:no-open-gop=1:nal-hrd=VBR:force-cfr -level 5.1 -profile:v main10 -preset slow -crf 23 -maxrate 3M -bufsize 3M -force_key_frames "expr:eq(mod(n,100),0)" -c:a:0 aac -ac:a:0 2 -ab:a:0 128k -y foo_crf23_3.mp4


OS: RHEL 7.3 x64
CPU : Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz x 2
So 40 "cores"
ffmpeg 4.1.3 static

Can never get over 10% usage with 1 encode job..
Any tips? Ive tried ffmpeg threads = 20... didnt help much..
Mov file is local
540p is rather low, so you might not get great utilization, but 10% sounds a bit low either way, with --ctu 32 --merange 26 I have no issue to saturate 24threads. and without it i can saturate arround 16threads for 1080p video.

Imo the multithread scaling with x265 is already very impressive, note sure why people think there is some issue cause it doesnt scale infinitely, this is still an complex GOP-based codec so unless you do chunk encoding there will never be infinite scaling.

Last edited by excellentswordfight; 3rd May 2019 at 09:10.
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