compn <[EMAIL PROTECTED]> added the comment:

aspect copying has some trouble too

# ffmpeg -i 1.mkv -acodec copy -vcodec copy -t 10 -aspect 4:3 -y output.mkv
FFmpeg version SVN-r14380, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --enable-libmp3lame --enable-libfaac --enable-postproc --
enable-gpl --enable-postproc
  libavutil version: 49.7.0
  libavcodec version: 51.60.0
  libavformat version: 52.18.0
  libavdevice version: 52.0.0
  built on Aug  6 2008 18:36:57, gcc: 4.1.2 20071124 (Red Hat 4.1.2-42)
[matroska @ 0x8cbf2d0]Ignoring seekhead entry for ID=0x1549a966
[matroska @ 0x8cbf2d0]Ignoring seekhead entry for ID=0x1654ae6b
[matroska @ 0x8cbf2d0]Ignoring seekhead entry for ID=0x114d9b74

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 
(1000/1) -> 25.00 (25/1)
Input #0, matroska, from '1.mkv':
  Duration: 00:00:10.04, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: h264, yuv420p, 704x432 [PAR 1:1 DAR 44:27], 25.00 tb(r)
    Stream #0.1: Audio: ac3, 48000 Hz, stereo
Output #0, matroska, to 'output.mkv':
    Stream #0.0: Video: 0x0000, yuv420p, 704x432, q=2-31, 1000.00 tb(c)
    Stream #0.1: Audio: ac3, 48000 Hz, stereo
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
frame=  251 fps=  0 q=-1.0 Lsize=    1674kB time=9.50 bitrate=1443.8kbits/s    
video:1121kB audio:547kB global headers:0kB muxing overhead 0.376099%

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