[FFmpeg-user] what's the threads mode when using ffmpeg to transcode

[Henk D. Schoneveld]

On 06 Nov 2014, at 10:47, cmwu <277893958 at qq.com> wrote:

> hi,
> I am confused how ffmpeg  allocate it's cpu resource when i am using ffmpeg
> to transcoding, 
> 
> for example:
>   how much resource to decode, and how much to encode
> 
> I have set the threads to 1 and do a experiment:
> ffmpeg2.1 -i /home/mps/chd/out.avi -acodec pcm_s16le -ar 44100 -ac 2 
> -vcodec libx264 -coder 1 -b:v 250k -x264opts
> min-keyint=1:keyint=75:no-dct-decimate:partitions=all:8x8dct:merange=24:trellis=1:ratetol=1:qpmin=20:qpmax=45:aq-strength=1.0:psy-rd=1,0:subme=7:qcomp=0.6:chroma-qp-offset=0:me=umh:frameref=6:bframes=6:b-pyramid=1:b-adapt=2:weightp=2:direct=auto:deblock=1,0:stitchable=1,
> threads=1 -timelimit 6000 -r  15 -pass 1 -passlogfile
> /home/mps/cmwu/passlog_1414744300_h264_1.log -f null -y /dev/null
> 
> I found the cpu load use is 140%, it's not 100%
AFAIK threads 1 is meaning 1 Core for Encoding. So the extra 40% is used for decoding, logfile/IO activity and Audio stuff.
> 
> Can anybody explain it for me ?
> 
> 
> 
> 
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