[FFmpeg-user] subtitles extraction

[Alessandro Magni]

I am struggling to extract the subtitles from an ISO image - I have 
tried different ways following various guides, always failing -
hope you can make sense of what I'm doing wrong:

1) ffmpeg -i mpfc.iso -vn -an -c copy a.srt

ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
   built on Oct 16 2013 22:38:20 with gcc 4.8.1 (GCC) 20130603 (Red Hat 
4.8.1-1)
   configuration: --prefix=/usr --bindir=/usr/bin 
--datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg 
--libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 
--optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
-fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 
-mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r 
--enable-gnutls --enable-libass --enable-libcelt --enable-libdc1394 
--disable-indev=jack --enable-libfreetype --enable-libgsm 
--enable-libmp3lame --enable-openal --enable-libopencv 
--enable-libopenjpeg --enable-libopus --enable-libpulse 
--enable-libschroedinger --enable-libspeex --enable-libtheora 
--enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 
--enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample 
--enable-postproc --enable-pthreads --disable-static --enable-shared 
--enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 
--enable-runtime-cpudetect
   libavutil      52. 18.100 / 52. 18.100
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.104 / 54. 63.104
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 42.103 /  3. 42.103
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 0x8faa80] max_analyze_duration 5000000 reached at 5000000 
microseconds
Input #0, mpeg, from 'mpfc.iso':
   Duration: 00:30:49.06, start: 62.047267, bitrate: 4316 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 
16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x24]: Subtitle: dvd_subtitle
File 'a.srt' already exists. Overwrite ? [y/N] y
Unsupported subtitles codec: dvd_subtitle
Output #0, srt, to 'a.srt':
   Metadata:
     encoder         : Lavf54.63.104
     Stream #0:0: Subtitle: dvd_subtitle
Stream mapping:
   Stream #0:2 -> #0:0 (copy)
Could not write header for output file #0 (incorrect codec parameters 
?): Invalid argument

----------------------------------------------------------------------
2) ffmpeg -i mpfc.iso  -vn -an -codec:s:0.2 srt a.srt
ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
   built on Oct 16 2013 22:38:20 with gcc 4.8.1 (GCC) 20130603 (Red Hat 
4.8.1-1)
<...config lines skipped...>
[mpeg @ 0x640a80] max_analyze_duration 5000000 reached at 5000000 
microseconds
Input #0, mpeg, from 'mpfc.iso':
   Duration: 00:30:49.06, start: 62.047267, bitrate: 4316 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 
16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x24]: Subtitle: dvd_subtitle
File 'a.srt' already exists. Overwrite ? [y/N] y
Output #0, srt, to 'a.srt':
     Stream #0:0: Subtitle: srt
Stream mapping:
   Stream #0:2 -> #0:0 (dvdsub -> srt)
Error while opening encoder for output stream #0:0 - maybe incorrect 
parameters such as bit_rate, rate, width or height

----------------------------------------------------------------------
3) ffmpeg -i mpfc.iso -an -vn -map 0:s:0 -c:s:0 srt a.srt
ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
   built on Oct 16 2013 22:38:20 with gcc 4.8.1 (GCC) 20130603 (Red Hat 
4.8.1-1)
<...config lines skipped...>
[mpeg @ 0x2638aa0] max_analyze_duration 5000000 reached at 5000000 
microseconds
Input #0, mpeg, from 'mpfc.iso':
   Duration: 00:30:49.06, start: 62.047267, bitrate: 4316 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 
16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
     Stream #0:2[0x24]: Subtitle: dvd_subtitle
File 'a.srt' already exists. Overwrite ? [y/N] y
Output #0, srt, to 'a.srt':
     Stream #0:0: Subtitle: srt
Stream mapping:
   Stream #0:2 -> #0:0 (dvdsub -> srt)
Error while opening encoder for output stream #0:0 - maybe incorrect 
parameters such as bit_rate, rate, width or height

----------------------------------------------------------------------


unfortunately I understand nothing about ffmpeg usage!

alessandro


-- 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/  Dr.Alessandro Magni
\        Electromagnetics Division
/        INRiM Strada delle Cacce 91, 10135 Torino (ITALIA)
\        Email magni at inrim.it
/        Tel: 0039-011-3919821  Fax: 0039-011-3919834
\        URL http://www.inrim.it/~magni
/ Our business in life is not to succeed but to continue to fail
\ in high spirits.  -- Robert Louis Stevenson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~