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Scratchy sound when encoding mkv to DVD with mencoder


I've a problem trying to convert a mkv video into a DVD suitable for a
home DVD player:

I use stable/testing, with debian-multimedia repositories for mplayer
and mencoder, and when I try to encode the mkv, I've a scratchy sound,
and only the firsts minuts of the video encoded.

Using mplayer to read the mkv works like a charm, but mencoder say after
a few seconds:

  > Too many audio packets in the buffer: (4096 in 4194304 bytes).
  > Maybe you are playing a non-interleaved stream/file or the codec failed?
  > For AVI files, try to force non-interleaved mode with the -ni option.
  > Flushing video frames.
  > Writing index...
  > Overhead: 2.566% (1060247 / 41314921)
  > Writing header...
  > Video stream: 2901.276 kbit/s  (362659 B/s)  size: 38746537 bytes  106.840 secs  2331 frames
  > Audio stream:  192.000 kbit/s  (24000 B/s)  size: 2574336 bytes  107.264 secs

My encoding options are:

mencoder -really-quiet -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd:tsaf -vf scale=720:576,harddup -srate 48000 -af lavcresample=48000 -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=5000:keyint=15:vstrict=0:acodec=ac3:abitrate=192:aspect=16/9 -ofps 25 -o <fileOut.mpg> <fileIn.mkv>

I've looked at the net (not enough?), but nothing really revelant.

mencoder:  3:1.0~rc4+svn20110505-0.0
mplayer:   3:1.0~rc4+svn20110505-0.0

Any help appreciated.

Thanks in advance.

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