-ss option problem reading vob file

Hi,


-ss option isn't working in an specific vob file I have. This vob file
probably is a little screwed up but transcode can skip portions of it and
both xine and mplayer can play and seek in it so it can't be that screwed
up.

When I try to extract raw audio and video from it I get a really small file
and the following messages:

# /usr/local/ffmpeg-20060425/bin/ffmpeg -y -v 512 -ss 00:00:31 -i
/mnt/temp/VIDEO_TS/VTS_01_1.VOB -f avi -vcodec rawvideo -acodec pcm_s16le
/rip/teste/bug-ffmpeg_cvs-seek.avi
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --prefix=/usr/local/ffmpeg-20060425 --disable-static
--enable-shared --cc=i686-pc-linux-gnu-gcc --extra-ldflags= --disable-mmx
--disable-altivec --disable-v4l --disable-v4l2 --disable-dv1394
--disable-network --disable-opts --enable-mp3lame --enable-a52 --enable-xvid
--enable-libogg --enable-vorbis --enable-theora --enable-dts --enable-x264
--enable-faad --enable-faac --enable-gpl --enable-pp --disable-strip
  libavutil version: 49.0.0
  libavcodec version: 51.9.0
  libavformat version: 50.4.0
  built on Apr 25 2006 10:22:05, gcc: 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0,
pie-8.7.9)
[mpeg @ 0xb7ee3600]read_seek: 0 2810283
[mpeg @ 0xb7ee3600]using cached pos_min=0x3ff4380e dts_min=1216088
[mpeg @ 0xb7ee3600]pos_min=0x3ff4380e pos_max=0x3ff6c80e dts_min=1216088
dts_max=1231103
[mpeg @ 0xb7ee3600]1072969742 1073137678 1073137678 / 1216088 1231103
1231103 target:2810283 limit:1073137678 start:1073137678 noc:1
[mpeg @ 0xb7ee3600]pos=0x3ff6c80e 1231103<=2810283<=-9223372036854775808
Input #0, mpeg, from '/mnt/temp/VIDEO_TS/VTS_01_1.VOB':
  Duration: 00:00:13.2, start: 0.225367, bitrate: 646161 kb/s
  Stream #0.0[0x1e0], 1/90000, 29.97 fps(r): Video: mpeg2video, yuv420p,
704x480, 1001/30000, 9558 kb/s
  Stream #0.1[0x80], 1/90000: Audio: ac3, 48000 Hz, stereo, 256 kb/s
Output #0, avi, to '/rip/teste/bug-ffmpeg_cvs-seek.avi':
  Stream #0.0, 1/90000, 29.97 fps(c): Video: rawvideo, yuv420p, 704x480,
1001/30000, q=2-31, 200 kb/s
  Stream #0.1, 1/90000: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
[mpeg2video @ 0xb7e09004]ac-tex damaged at 40 10
[mpeg2video @ 0xb7e09004]Warning MVs not available
[mpeg2video @ 0xb7e09004]concealing 880 DC, 880 AC, 880 MV errors
*** drop!
frame=    0 q=0.0 Lsize=       9kB time=10000000000.0 bitrate=   0.0kbits/s
dup=0 drop=1
video:0kB audio:0kB global headers:0kB muxing overhead inf%

If I take the -ss option out, everything goes well.

I have already mentioned it before (in ffmpeg-devel) and basically I was
told to repost it here so I'm doing it. There was a sample at
ftp.mplayerhq.hu:/MPlayer/incoming/ffmpeg_ss_option. It's called
no-ss_sample.vob. I couldn't upload a description because I'm getting the
following error: put: Access failed: 553 Could not create file.
(no-ss_sample.txt) I am not sure it's still there as I uploaded it April 20.

Does anybody wants to take a look at it? This is not a case of
"please-please-help-me-I-need-to-process-this-file-now-or-I'm-fired". My
issue is already solved, I don't need to reprocess that file. I'm bring it
back just because it might be an oportunity to strengh ffmpeg vob reading.
If nobody wants to look at it, please consider the subject dropped.


Rodrigo Severo