[MPlayer-users] extracting subtitles from .vob

[Matt Zagrabelny]

Greetings,

I've ripped a few dvds into .vobs using mplayer:

mplayer dvd://1 -dumpstream -dumpfile movie.vob

and subtitles are there when I view movie.vob.

Now I'd like to extract the subtitles for OCR.

I've tried mencoder:

mencoder movie.vob -oac copy -ovc copy -vobsubout movie_subs -o /dev/null

But something isn't quite right:

mencoder movie.vob -oac copy -ovc copy -vobsubout movie_subs -o /dev/null
MPlayer SVN-r37342 (C) 2000-2013 MPlayer Team
success: format: 0  data: 0x0 - 0x640ec800
libavformat version 56.16.101 (internal)
MPEG-PS file format detected.
VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  9800.0 kbps (1225.0 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.970  ftime:=0.0334
videocodec: framecopy (720x480 24bpp fourcc=10000002)
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
Pos:   3.9s    117f ( 0%)  0.00fps Trem:   0min   0mb  A-V:0.000 [4995:0]

1 duplicate frame(s)!
Pos:   4.1s    122f ( 0%)  0.00fps Trem:   0min   0mb  A-V:0.000 [4752:0]
.
.
.
.
1 duplicate frame(s)!
Pos: 175.9s   4241f ( 2%)  0.00fps Trem:   0min 4748mb  A-V:0.000 [6318:0]

Too many audio packets in the buffer: (4096 in 8257532 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.

Video stream: 6317.114 kbit/s  (789639 B/s)  size: 138904701 bytes
175.909 secs  4241 frames

Any suggestions for what to do? I'd like to be able to extract the
subtitles without the IFO file.

Thanks for any hints!

-m