[FFmpeg-user] ffmpeg x265 on multi-cpus

Reindl Harald h.reindl at thelounge.net
Mon Apr 10 15:58:33 EEST 2017

Am 10.04.2017 um 14:55 schrieb Erik Slagter:
>> Am 10.04.2017 um 14:43 schrieb fred fred:
>>> thank you Moritz !
>>> anyway, even with -threads 0
>>> x265 [info]: Thread pool created using 24 threadsx265 I see with top
>>> command between 400% - 500% CPU on ffmpeg ... I was expected like
>>> 2400% or 24 ffmpeg workers with 100%
>> how did you come to the conclusion that parallelization scales magically
>> and with no limits? if that would be realistic just throwing enough CPU
>> cores on whatever problem would be the soplution - but that is not how
>> computers are working
> On the other hand, both libx264 and libx265 do scale quite well by
> smartly dividing the work over all available threads. Yes, you can
> really have up to 800% cpu usage on a 4x2 cpu (which is quite
> impressive), with both of them

but you can't expect that that scales up to every core count

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