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papu
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PostPosted: Tue Jun 06, 2017 2:27 pm    Post subject: how extract subtitles from vob under gentoo? Reply with quote

i use ffmepg for raw video and audio but it not detect vob subtitles to extract them, same with mkvtoolnix...
handbrake detect subtitles but i have to rip entire video ( or not have and option to extract raw video)

i can't use makemkv because it depens of openssl and i am using libressl :(

there any program to extract vob subtitles( .idx)?


thanks so much
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PostPosted: Thu Jun 08, 2017 12:38 pm    Post subject: Reply with quote

Hm. Have you tried -vn -an -c:s copy? That should drop audio and video but leave only subtitles. Although ffmpeg should be smart enough to recognize what you're trying to do if you assing output to be a subtitle file like: ffmpeg -i video.vob output.srt for example.
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PostPosted: Thu Jun 08, 2017 1:23 pm    Post subject: Reply with quote

Zucca wrote:
Hm. Have you tried -vn -an -c:s copy? That should drop audio and video but leave only subtitles. Although ffmpeg should be smart enough to recognize what you're trying to do if you assing output to be a subtitle file like: ffmpeg -i video.vob output.srt for example.


seems ffmpeg no detect subtitles inside of vob( dvd directory), i have tried some dvd and that is, and neither mkvtoolnix
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PostPosted: Thu Jun 08, 2017 1:27 pm    Post subject: Reply with quote

What's the error message when you try to extract subtitles?
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PostPosted: Thu Jun 08, 2017 4:07 pm    Post subject: Reply with quote

Zucca wrote:
What's the error message when you try to extract subtitles?

none , just not detect them :)

Code:
$ ffprobe VTS_03_1.VOB
ffprobe version 3.3.1 Copyright (c) 2007-2017 the FFmpeg developers
  built with gcc 6.3.0 (Gentoo 6.3.0 p1.0)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-3.3.1/html --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 -pipe' --disable-static --enable-avfilter --enable-avresample --disable-stripping --enable-nonfree --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-nonfree --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-gcrypt --disable-gnutls --disable-gmp --enable-gpl --enable-hardcoded-tables --enable-iconv --enable-lzma --enable-network --enable-openssl --enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --disable-vaapi --enable-vdpau --enable-xlib --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --enable-openal --enable-opengl --disable-libv4l2 --disable-libpulse --disable-libopencore-amrwb --disable-libopencore-amrnb --enable-libfdk-aac --disable-libopenjpeg --enable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-mmal --disable-libmodplug --disable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libschroedinger --disable-libspeex --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-libbs2b --disable-chromaprint --disable-libflite --disable-frei0r --disable-libfribidi --enable-fontconfig --disable-ladspa --enable-libass --enable-libfreetype --disable-librubberband --disable-netcdf --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-libvo-amrwbenc --enable-libmp3lame --disable-libkvazaar --disable-nvenc --disable-libopenh264 --disable-libsnappy --disable-libtheora --disable-libtwolame --disable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=host --disable-doc --disable-htmlpages --enable-manpages
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, mpeg, from 'VTS_03_1.VOB':
  Duration: 00:14:58.56, start: 0.360000, bitrate: 9559 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 720x576 [SAR 64:45 DAR 16:9], 8500 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    Stream #0:3[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Unsupported codec with id 100357 for input stream 0


equery u ffmpeg https://paste.pound-python.org/show/pmuWFJeSEBWfU3AL6Kh3/
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PostPosted: Thu Jun 08, 2017 10:12 pm    Post subject: Reply with quote

Well... This sure ain't simple.

I found this.
And I went and tried following:
Code:
cat VIDEO_TS/VTS*.VOB | ffmpeg -y -fflags +genpts -analyzeduration 1000000k -probesize 1000000k -i - -vn -an -c:s srt /tmp/subs.srt
... but it fails. :(
My ffmpeg-fu isn't there yet to solve this here and now...
I'll inform if I found a way.
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PostPosted: Thu Jun 08, 2017 10:27 pm    Post subject: Reply with quote

Haven't tried any, but methinks MPlayer, MPV and VLC may be able to do it.
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PostPosted: Thu Aug 31, 2017 4:48 pm    Post subject: Reply with quote

subs in vobfiles are actually a video-stream, but .srt is a text-format - even ffmpeg cannot transcode this. for ffmpeg to detect the subtitle-stream in a vobfile analyzeduration has to be set extremely high, but even then it sometimes does not work.

to generate a textfile from the video stream i use the following steps (it's been a long time but this should still work):

1. extract the subtitle-videostream of sid 0 with mencoder:
Code:
mencoder <VOBFILE> -nosound -ovc frameno -o /dev/null -vobsuboutindex 0 -sid 0 -vobsubout <SUBFILE>

this should generate <SUBFILE>.sub and <SUBFILE>.idx.

2. then convert the video- and index-files to image-files (eg .tiff) with subp2tiff (included in media-video/ogmrip)
Code:
subp2tiff <SUBFILE>
(no file-extension)
this generates a lot of small image-files and <SUBFILE>.xml.

3. use OCR to convert the imagefiles to textfiles, i use app-text/tesseract.
a loop over all <SUBFILE>-nnnn.tiff creates <SUBFILE>-nnnn.tiff.txt
eg
Code:
for i in $(ls *.tif); do tesseract -l <LANGUAGE> $i $i; done

you have to set <LANGUAGE> to one of tesseracts language-codes or OCR will not work.

4. create final .srt-file with subptools (also from media-video/ogmrip)
Code:
subptools -s -t srt -n lf -i <SUBFILE>.xml -o <SUBFILE>.srt


these steps are quite easily scriptable.
before you mux the .srt-file into your mkv you can change/correct/... it.

to find the SIDs i am interested in i use midentify from mplayer which in this case i think is more flexible than ffmpeg; it works with iso-files, dvd-dirs and vobfiles.

You can also use the ogmrip-gui which basically does the same things but i think it forces you into "full-auto" mode and has no option to only extract and convert the subs.

GOOD LUCK!
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PostPosted: Sat Sep 09, 2017 11:35 pm    Post subject: Reply with quote

Nice post, DawgG.

One minor edit for step 3:
Code:
for i in $(ls *.tif); do tesseract -l <LANGUAGE> $i $i; done
is much safer as:
Code:
for i in *.tif; do tesseract -l <LANGUAGE> "$i" "$i"; done
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PostPosted: Sun Sep 10, 2017 8:06 am    Post subject: Reply with quote

oh thanks you so much , i have to do this when i have time, media-video/ogmrip need the mplayer ..hehehe.
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