[MPlayer-users] Splitting and Rejoining Movies

[D. Starner]

I taped a movie from cable recently, and took it to a friend's house over Christmas 
and transferred it to MPEG2. I then tried to encode it to MPEG4 in three sections, 
so I could delogo it only where necessary, like so.

mencoder  -endpos 595  -nosound -ovc lavc -lavcopts vcodec=mpeg4:gray:vbitrate=1250: -oac copy Noname-002.mpg -o Cops/Sect2.avi

mencoder -ss 595 -endpos 32  -nosound -ovc lavc -lavcopts vcodec=mpeg4:gray:vbitrate=1250 -vf delogo=530:390:130:35 -oac copy Noname-002.mpg -o Cops/Sect3.avi

mencoder  -ss  627  -nosound -ovc lavc -lavcopts vcodec=mpeg4:gray:vbitrate=1250 -oac copy Noname-002.mpg -o Cops/Sect4.avi

(Slightly simplified; the actual run was two pass, among other things.)

The problem is, the end of Sect2 is not the start of Sect3; -endpos 595 doesn't match 
-ss 595. I don't care if I delogo a few seconds of movie that didn't need to be delogoed, 
but I need the end of Sect2 to match up exactly to the start of Sect3. I think the 
problem lies in the messages "demux_mpg: 24fps progressive NTSC content detected, 
switching framerate." and "1 duplicate frame(s)!" that mencoder spits out when reading 
the MPEG2 input. How do I match the ends of Sect2 and Sect3 up right? I don't care if I 
delogo a few seconds of movie that didn't need to be delogoed, but I need the end of 
Sect2 to match up exactly to the start of Sect3.

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