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

[cmwu]

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%

Can anybody explain it for me ?




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