[MEncoder-users] capture: synchronization problems

[RC]

On Sat, 19 Mar 2005 21:28:15 -0800 (PST)
Kyle Schmitt <azephrahel at yahoo.com> wrote:

>   Go ahead and look at the fps your able to encode
> vcodec=mpeg4 vs vcodec=mjpeg or vcodec=mpeg2video. 
> Don't turn on 101 quality optimizations like vhq and
> qpel and all that, just capture at plain
> vcodec=mepg4:vbitrate=4096.

I did just that, and MPEG2 is faster than both MPEG4 and MJPEG (though not by too much).  I am actually surprised that MPEG2 isn't faster, as my normal encodings show MPEG2 to be noticably faster than MPEG4...  Perhaps with mbd=2 and trell the differences are more significant.

Tests done on an otherwise idle 1.66GHz Athlon XP 2000+ proc, running Slackware 10, Reiserfs, etc.  Encoded from ~30MIN high-bitrate MPEG2 capture.  MPlayer 1.0pre6-3.3.4

vcodec=mpeg4:vbitrate=4096
real    17m56.588s
875M     now-mpeg4.avi

vcodec=mpeg2video:vbitrate=4096
real    17m47.667s
875M    now-mpeg2.avi

vcodec=mpeg4:vbitrate=4096:keyint=1
real    12m13.516s
1090M    now-mpeg4-allkey.avi

vcodec=mpeg2video:vbitrate=4096:keyint=1
real    11m54.290s
1243M   now-mpeg2-allkey.avi

vcodec=mjpeg:vbitrate=4096 [:keyint=1]
real    12m17.163s
1451M   now-mjpeg.avi