$ avconv -i VHS31.mp4 -c copy VHS31_copy.mp4
avconv version 0.8-4:0.8-1ubuntu2, Copyright (c) 2000-2011 the Libav developers
  built on Feb  9 2012 08:03:03 with gcc 4.6.2
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x8b19c0] multiple edit list entries, a/v desync might occur, patch welcome
[h264 @ 0x8b95a0] reference picture missing during reorder
[h264 @ 0x8b95a0] reference count overflow
[h264 @ 0x8b95a0] decode_slice_header error
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VHS31.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: mp41avc1qt  
    creation_time   : 2012-02-17 19:37:47
    encoder         : vlc 2.0.0 stream output
    encoder-eng     : vlc 2.0.0 stream output
  Duration: 00:00:06.19, start: 0.000000, bitrate: 2184 kb/s
    Stream #0.0(eng): Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      creation_time   : 2012-02-17 19:37:47
    Stream #0.1(eng): Video: h264 (High), yuv420p, 768x576 [PAR 1:1 DAR 4:3], 2048 kb/s, 24.68 fps, 25 tbr, 1001 tbn, 50 tbc
    Metadata:
      creation_time   : 2012-02-17 19:37:47
Output #0, mp4, to 'VHS31_copy.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: mp41avc1qt  
    creation_time   : 2012-02-17 19:37:47
    encoder-eng     : vlc 2.0.0 stream output
    encoder         : Lavf53.20.0
    Stream #0.0(eng): Video: libx264, yuv420p, 768x576 [PAR 1:1 DAR 4:3], q=2-31, 2048 kb/s, 1001 tbn, 1001 tbc
    Metadata:
      creation_time   : 2012-02-17 19:37:47
    Stream #0.1(eng): Audio: libvo_aacenc, 44100 Hz, stereo, 128 kb/s
    Metadata:
      creation_time   : 2012-02-17 19:37:47
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press ctrl-c to stop encoding
[mp4 @ 0x8cb340] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 25207 >= 25207
av_interleaved_write_frame(): Invalid argument