[MPlayer-users] ffmpeg mpeg1 encoding test

Michael Niedermayer michaelni at gmx.at
Sat Sep 20 00:38:23 CEST 2003


On Friday 19 September 2003 11:50, Fabio Papa wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi all,
> could someone with encoding experience try a little experiment, just to
> make sure I'm not the only one with this problem?
> Try compressing any video you wish to mpeg1video using lavc, whatever
> parameters you think is necessary, to an avi file using mencoder.
> It should play correctly and should output something like:
> VIDEO:  [mpg1]  480x576  24bpp  25.000 fps  779.5 kbps (95.2 kbyte/s)
> VIDEO:  MPEG1  480x576  (aspect 1)  25.000 fps  779.5 kbps (97.4 kbyte/s)
> Then try to extract the video stream using ffmpeg, since it's the only way
> (at least that I know of):
> ffmpeg -i avifile -vcodec copy -f rawvideo mpgfile
> then play that file. What I see is this:
> MPEG-ES file format detected.
> VIDEO:  MPEG1  480x576  (aspect 1)  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
> Obviously something is very wrong here. This behaviour has started since
> after 0.4.7 ffmpeg got out. Needless to say I cannot use those videos in
> any DVD author app. It seems to me like mpeg1video is relying on the avi
> container for the kbps/sec value, and doesn't have one of its own.
> Can somebody throw some light in this?
try to set -lavcopts vrc_maxrate=...
(and yes feedback is welcome ...)

level[i]= get_vlc(); i+=get_vlc();		(violates patent EP0266049)
median(mv[y-1][x], mv[y][x-1], mv[y+1][x+1]);	(violates patent #5,905,535)
buf[i]= qp - buf[i-1];				(violates patent #?)
for more examples, see http://mplayerhq.hu/~michael/patent.html
stop it, see http://petition.eurolinux.org & http://petition.ffii.org/eubsa/en

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