mpeg2video demux-decode-encode-mux uses only 50% cpu when multithreading (need frame multithreading)
|Reported by:||darkbit||Owned by:|
|Blocking:||Reproduced by developer:||yes|
|Analyzed by developer:||yes|
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
Change History (6)
comment:5 Changed 4 years ago by michael
- Analyzed by developer set
- Reproduced by developer set
- Summary changed from mpeg2video cpu usage bottleneck to mpeg2video demux-decode-encode-mux uses only 50% cpu when multithreading
- Version changed from unspecified to git-master