I use this ffmpeg command to take clips from a large VOB files that is on a DVD:
ffmpeg.exe -i E:\VTS_02_2.vob -ss 00:00:57 -t 00:16:15 vids\VTS_02_2.vob
It worked first for a VOB file but then I got these errors:
c:\ffmpeg>ffmpeg.exe -i E:\VTS_02_2.vob -ss 00:00:57 -t 00:16:15 vids\VTS_02_2.vob
FFmpeg version SVN-r15625, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --enable-memalign-hack --enable-postproc --enable-swscale --enable-g
l --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libv
rbis --enable-libtheora --enable-libx264 --enable-libxvid --disable-ffserver --disabl
-vhook --enable-avisynth --enable-pthreads
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 0. 0 / 52. 0. 0
libavformat 52.22. 1 / 52.22. 1
libavdevice 52. 1. 0 / 52. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Oct 16 2008 05:40:02, gcc: 4.2.4 (TDM-1 for MinGW)
Input #0, mpeg, from 'E:\VTS_02_2.vob':
Duration: 00:17:11.61, start: 1031.828511, bitrate: 8326 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 9640
kb/s, 25.00 tb(r)
Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
File 'vids\VTS_02_2.vob' already exists. Overwrite ? [y/N] y
Output #0, svcd, to 'vids\VTS_02_2.vob':
Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=2-31, 200
kb/s, 25.00 tb(c)
Stream #0.1: Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
[ac3 @ 026D3990]frame sync error
Error while decoding stream #0.1
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
[mpeg2video @ 0141B780]ac-tex damaged at 40 2
[mpeg2video @ 0141B780]invalid mb type in B Frame at 3 12
[mpeg2video @ 0141B780]00 motion_type at 15 16
[mpeg2video @ 0141B780]mb incr damaged
[mpeg2video @ 0141B780]00 motion_type at 2 21
[mpeg2video @ 0141B780]00 motion_type at 44 22
[mpeg2video @ 0141B780]ac-tex damaged at 43 24
[mpeg2video @ 0141B780]Warning MVs not available
[mpeg2video @ 0141B780]concealing 765 DC, 765 AC, 765 MV errors
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
[mpeg2video @ 0141B780]ac-tex damaged at 5 9
[mpeg2video @ 0141B780]00 motion_type at 21 13
[mpeg2video @ 0141B780]ac-tex damaged at 1 20
[mpeg2video @ 0141B780]mb incr damaged
[mpeg2video @ 0141B780]00 motion_type at 30 30
[mpeg2video @ 0141B780]Warning MVs not available
[mpeg2video @ 0141B780]concealing 450 DC, 450 AC, 450 MV errors
[ac3 @ 026D3990]frame CRC mismatch
[ac3 @ 026D3990]incomplete frame
[ac3 @ 026D3990]invalid frame size
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
[mpeg2video @ 0141B780]00 motion_type at 38 15
[mpeg2video @ 0141B780]00 motion_type at 30 34
[mpeg2video @ 0141B780]Warning MVs not available
[mpeg2video @ 0141B780]concealing 254 DC, 254 AC, 254 MV errors
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
[mpeg2video @ 0141B780]ac-tex damaged at 7 6
[mpeg2video @ 0141B780]concealing 1350 DC, 1350 AC, 1350 MV errors
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
[ac3 @ 026D3990]incomplete frame
[ac3 @ 026D3990]invalid frame size
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
frame= 0 fps= 0 q=0.0 Lsize= 0kB time=10000000000.00 bitrate= 0.0kbits/s
video:0kB audio:0kB global headers:0kB muxing overhead -1.#IND00%
Is there a way to force ffmpeg to just give me an output?
The lines that start with [mpeg2video @ 0141B780] show general decoding errors. Sometimes these are nothing to worry about because FFMPEG successfully keeps going on after such errors (the errors may apply only to the current frame); they may represent glitches in the encoder used to encode the source, or even transfer errors.
Of concern here, though, are all the zeros in the other lines:
frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
It seems to be having trouble making sense of the source. What does Media Info tell you about the source VOB?
This community may not be very well geared towards solving audio/video encoding issues - have you tried doom9.org? You may need to get someone to have a look at a sample of the source VOB for you.
Presumably you are using the command line version of ffmpeg because you want to automate this; if not, note that tools such as AVIdemux could do this in a GUI too. Despite its name it can copy MPEG without re-encoding.