[MEncoder-users] Bad mencoder video with -ss and -endpos

[Greger Bergman]

Hello,

I am trying to extract a small sample from an avi movie. The video 
quality of the sample is not good in the beginning. My question is why?

The movie was encoded from a dvd:

    mencoder dvd://1 -oac mp3lame -lameopts abr:br=128 -aid 128 \
      -ovc frameno -o frameno.avi

    mencoder dvd://1 -oac copy -ovc xvid -xvidencopts pass=1 \
      -vf crop=704:416:2:80,scale=640:272 -o /dev/null

    menoder dvd://1 -oac copy -ovc xvid -xvidencopts pass=2:bitrate=867 \
      -vf crop=704:416:2:80,scale=640:272 -o movie.avi

The sample:

    mencoder -oac copy -ovc copy -ss 00:54:05 -endpos 60 \
      -o sample.avi movie.avi


If I encode the sample with -nosound the video looks good:

    mencoder -nosound -ovc copy -ss 00:54:05 -endpos 60 \
      -o sample.avi movie.avi

It seems to me that the audio is my problem.

Any tips on how to solve this problem would be much appreciated.

/Greger