[FFmpeg-trac] #1257(avcodec:new): ffmpeg multithread decoding, the rate is not improved
FFmpeg
trac at avcodec.org
Sat Apr 28 09:47:30 CEST 2012
#1257: ffmpeg multithread decoding,the rate is not improved
-------------------------------------+-------------------------------------
Reporter: xiaoyu | Type:
Status: new | enhancement
Component: avcodec | Priority: wish
Keywords: multithread | Version: git-
decode | master
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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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!
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1257>
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