[FFmpeg-trac] #1912(undetermined:new): mpeg2video cpu usage bottleneck
FFmpeg
trac at avcodec.org
Tue Nov 13 02:51:55 CET 2012
#1912: mpeg2video cpu usage bottleneck
-------------------------------------+-------------------------------------
Reporter: darkbit | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: mpeg2video | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I tried to narrow it down as much as possible to ffmpeg so here is my log:
I noticed on my quad core machine that ffmpeg would not use more than 50%
on each core.
#First I created a ramdisk with lilo using append=" ramdisk_size=4194304"
#On fstab I added the line:
/dev/ram0 /ram tmpfs defaults 1 2
#then ran lilo
#created the /ram directory
#after the reboot with the ram disk I clocked up my cpu to its full clock
of 1600Mhz per core, using cpufreq-set.
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
branden 3433 179 0.2 266920 15316 pts/0 Sl+ 01:12 1:15 ffmpeg -threads 8
-i dex.mpg -an -vcodec mpeg2video -threads 8 -b 15000k dex.mpeg
ffmpeg -threads 8 -i in.mpg -an -vcodec mpeg2video -threads 8 -b 15000k
out.mpeg
frame=72058 fps=505 q=2.0 Lsize= 471050kB time=00:50:02.37
bitrate=1285.3kbits/s
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1912>
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