Starting additional ffmpeg process will raise CPU usage of all process of ffmpeg

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Starting additional ffmpeg process will raise CPU usage of all process of ffmpeg

ffmpeg-9

Hi everyone,

I have a strange behavior I do not understand.

1) I'm running a transcoding process on my CentOS server with ffmpeg. Everything smooth and fine. Process of ffmpeg takes 85% CPU. Great.
2) staring a second transcoding process on the same machine with ffmpeg (even same settings, different output folder), the first process takes surprisingly about 150% CPU (previously used 85%!!) and the second uses also around 150% CPU too.
3) staring a third encoding process (again everything like the first 2, just other output) all ffmpeg processes take around 190% CPU

Why does this happen? Why doesn't take any of the three processes around 85% CPU?

Thanks,
Fox
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Re: Starting additional ffmpeg process will raise CPU usage of all process of ffmpeg

Carl Eugen Hoyos-2
2017-10-04 12:01 GMT+02:00  <[hidden email]>:

> I have a strange behavior I do not understand.
>
> 1) I'm running a transcoding process on my CentOS server with
> ffmpeg. Everything smooth and fine. Process of ffmpeg takes
> 85% CPU. Great.
> 2) staring a second transcoding process on the same machine
> with ffmpeg (even same settings, different output folder), the
> first process takes surprisingly about 150% CPU (previously
> used 85%!!) and the second uses also around 150% CPU too.
> 3) staring a third encoding process (again everything like the
> first 2, just other output) all ffmpeg processes take around
> 190% CPU

How can I reproduce this?

> Why does this happen? Why doesn't take any of the three
> processes around 85% CPU?

Assuming this is reproducible:
Why do you believe this is related to (or can be fixed in) FFmpeg?

Carl Eugen
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