[FFmpeg-user] FFmpeg CPU usage

littlebat dashing.meng at gmail.com
Tue Aug 13 02:49:49 CEST 2013

On Mon, 12 Aug 2013 20:20:42 +0000 (UTC)
Pete <pjjuliana216 at gmail.com> wrote:

> I have a huge number of videos to transcode. The quality of the
> videos vary from low to medium. DVD quality is probably the highest
> quality. I have ffmpeg and libx264 compiled with pthreads and I use
> -threads 0 in my call to ffmpeg but I'm still not seeing 100% usage
> on all the cores. I need to maximize cpu usage since I'm not trying
> to transcode videos for a month straight. 
> Here is the ffmpeg call I'm using:
> ffmpeg -y -i "$i" -c:v libx264 -preset fast -b:v "$VID_BIT" -threads
> 0 -c:a libfdk_aac -b:a "$AUD_BIT" -f mp4 /"$OUT_DIR"/"$MD5"
> Could the libfdk_aac codec be the issue? I couldn't find anything
> online that explicitly stated whether or not this codec supports
> threading. I really hope it does since I need the audio to be able to
> stream in a browser and aac works very well for that purpose. 

Support you have 8 cores cpu, just start 8 or more ffmpeg command lines
you will get a 100% cpu usage.

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