[MPlayer-users] Telecine does not seem to be working

[John Brown]

Nico Sabbi <nicola_sabbi <at> fastwebnet.it> writes:

> 
> Il Thursday 27 September 2007 20:50:00 John Brown ha scritto:
> > Audio and video are hopelessly out of sync from the start and it
> > steadily gets worse:
> >
> > command line:
> > mencoder -oac lavc -ovc lavc -lavcopts
> > acodec=ac3:abitrate=96:vcodec=mpeg2video:vbitrate=1239:aspect=4/3
> > -of mpeg -mpegopts format=dvd:telecine:tsaf -o test.mpg -ss 1:30
> > -endpos 30 -vf scale=656:448,expand=720:480,harddup -ofps
> > 24000/10001 -srate 48000 -af lavcresample 48000 test.avi
> >
> >
> > Note the very large desync.
> 
> try with -demuxer lavf and/or with vlc (that don't do the crazy 
> framerate conversion while playing)
> 


mplayer -demuxer lavf test.mpg causes the video to play faster
than the audio. When the video reaches 30 seconds, the audio is
at about 26 seconds. Before, it was the other way around. Also,
the desync is smaller with -demuxer lavf.

I ran mencoder again, but I extended the length to 90 seconds.

1) MEncoder said, Video Stream 90.007 secs, Audio 90.016 secs
2) mplayer -identify says ID_LENGTH=80.75
3) PowerDVD (the software that came with my DVD burner) thinks
   that it is 1:26 (but it plays it in sync)
4) Media Player Classic thinks that it is 1:24, and also plays
   it in sync
5) As above with VLC

I don't have to telecine. I can just ofps 30000/1001 instead.
I only do it because I assume that duplicating frames wastes
bits. However, I need to be sure that the DVD player will
play it properly when I make the DVD.