id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
1257,"ffmpeg multithread decoding,the rate is not improved",xiaoyu,,"Hi!
I'm trying to decode .264 file using ffmpeg with -threads option,i'm using a dual-core computer and build ffmpeg using the pthread option,but  the rate is not improved,i wonder what is the reason.
my command line is:
time ./ffmpeg -y -threads 2  -thread_type slice -i test.264 test.yuv
and 
time ./ffmpeg -y -threads 1 -i test.264 test.yuv 
the time is close,i didn't see any improvement.
i tried to encode and transcode video using -threads option,i can see great improvment about twice speed improvent ,why does the multithread decode is not good?
i hope that someone  can help me solve the problem!",enhancement,closed,wish,avcodec,git-master,needs_more_info,h264,,,,0,0