[Ffmpeg-devel] matroska to vob frame skipping issue.

[Chris]

> Thanks for the sample.
> This issue is now fixed.
> 
> Aurel


Aurel,

Excellent job. Works perfectly on all my samples now. Many thanks.

There is another issue (now?) with that planet earth sample (and others). If
you pass-through the audio the file size is constantly at 76KB throughout
the encoding process. Then at the end there are loads of "buffer
underflows", the resultant mpg does not play:

ffmpeg.exe -y -i planet.earth.mkv -target dvd -acodec copy planet.earth.mpg
FFmpeg version SVN-r7159, Copyright (c) 2000-2006 Fabrice Bellard, et al.
  configuration:  --enable-a52 --enable-gpl --enable-memalign-hack
--disable-debug
  libavutil version: 49.1.0
  libavcodec version: 51.25.0
  libavformat version: 51.6.0
  built on Nov 29 2006 10:08:22, gcc: 3.4.4 (mingw special)
[matroska @ 00709434]Ignoring seekhead entry for ID=0x1549a966
[matroska @ 00709434]Ignoring seekhead entry for ID=0x1654ae6b
[matroska @ 00709434]Ignoring seekhead entry for ID=0x114d9b74
[matroska @ 00709434]Unknown entry 0x73a4 in info header
[matroska @ 00709434]Unknown track header entry 0x55aa - ignoring
[matroska @ 00709434]Unknown track header entry 0x23314f - ignoring
[matroska @ 00709434]Unknown track header entry 0x55ee - ignoring
[matroska @ 00709434]Unknown track header entry 0xaa - ignoring
[matroska @ 00709434]Unknown track header entry 0x55aa - ignoring
[matroska @ 00709434]Unknown track header entry 0x23314f - ignoring
[matroska @ 00709434]Unknown track header entry 0x55ee - ignoring
[matroska @ 00709434]Unknown track header entry 0xaa - ignoring
Input #0, matroska, from 'planet.earth.mkv':
  Duration: 00:01:02.3, bitrate: N/A
  Stream #0.0: Audio: ac3, 48000 Hz, 5:1
  Stream #0.1: Video: h264, yuv420p, 1280x720, 25.00 fps(r)
Assuming PAL for target.
Output #0, dvd, to 'planet.earth.mpg':
  Stream #0.0: Video: mpeg2video, yuv420p, 720x576, q=2-31, 6000 kb/s, 25.00
fps(c)
  Stream #0.1: Audio: ac3, 48000 Hz, 5:1
Stream mapping:
  Stream #0.1 -> #0.0
  Stream #0.0 -> #0.1
Press [q] to stop encoding
[dvd @ 00709434]buffer underflowB time=61.5 bitrate=  10.1kbits/s
[dvd @ 00709434]buffer underflow
[dvd @ 00709434]buffer underflow

[...]

[dvd @ 00709434]buffer underflow
[dvd @ 00709434]buffer underflow
[dvd @ 00709434]buffer underflow
[dvd @ 00709434]buffer underflow
frame= 1541 q=2.0 Lsize=   38154kB time=61.6 bitrate=5074.0kbits/s
video:34731kB audio:2919kB global headers:0kB muxing overhead 1.338196%


I am not sure whether this was an issue before or is a result of the recent
update.

Regards,

Chris