[FFmpeg-trac] #4855(avformat:new): Support subtitles in (most likely) broken old vdr recordings

[FFmpeg]

#4855: Support subtitles in (most likely) broken old vdr recordings
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  avformat
               Priority:  wish       |               Keywords:  mpegps
                Version:  git-       |  dvbsub dvdsub
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/58847
 A user uploaded a vdr recording that contains a digital television stream
 within a mpeg program stream. The recording is supposed to contain
 subtitles, possibly dvbsub, FFmpeg detects dvdsub but does not decode
 anything, just like vlc and MPlayer.
 {{{
 $ ffmpeg -i 002.vdr -filter_complex [0:0][0:3]overlay -qscale 2 -t 60
 out.avi
 ffmpeg version N-75300-g4a38078 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  2.100 / 57.  2.100
   libavformat    57.  2.100 / 57.  2.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6.  4.100 /  6.  4.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
   libpostproc    54.  0.100 / 54.  0.100
 [mpeg @ 0x2d034e0] Format mpeg detected only with low score of 25,
 misdetection possible!
 [NULL @ 0x2d899e0] start time for stream 3 is not set in
 estimate_timings_from_pts
 Input #0, mpeg, from '002.vdr':
   Duration: 00:01:03.96, start: 47298.333311, bitrate: 2244 kb/s
     Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 704x576
 [SAR 12:11 DAR 4:3], max. 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 192 kb/s
     Stream #0:2[0x1c1]: Audio: mp2, 48000 Hz, mono, s16p, 64 kb/s
     Stream #0:3[0x20]: Subtitle: dvd_subtitle
 Please use -q:a or -q:v, -qscale is ambiguous
 [mpeg @ 0x2d034e0] sub2video: using 704x576 canvas
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf57.2.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 704x576 [SAR
 12:11 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
     Metadata:
       encoder         : Lavc57.2.100 mpeg4
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
 192 kb/s
     Metadata:
       encoder         : Lavc57.2.100 ac3
 Stream mapping:
   Stream #0:0 (mpeg2video) -> overlay:main (graph 0)
   Stream #0:3 (dvdsub) -> overlay:overlay (graph 0)
   overlay (graph 0) -> Stream #0:0 (mpeg4)
   Stream #0:1 -> #0:1 (mp2 (native) -> ac3 (native))
 Press [q] to stop, [?] for help
 [mpeg2video @ 0x2d055e0] 00 motion_type at 36 29
 [mpeg2video @ 0x2d055e0] Warning MVs not available
 [mpeg2video @ 0x2d055e0] concealing 88 DC, 88 AC, 88 MV errors in P frame
 [mpeg2video @ 0x2d055e0] ac-tex damaged at 13 180:00:07.16
 bitrate=2335.5kbits/s
 [mpeg2video @ 0x2d055e0] Warning MVs not available
 [mpeg2video @ 0x2d055e0] concealing 44 DC, 44 AC, 44 MV errors in I frame
 [mpeg2video @ 0x2d055e0] ac-tex damaged at 11 900:00:13.96
 bitrate=2466.3kbits/s
 [mpeg2video @ 0x2d055e0] Warning MVs not available
 [mpeg2video @ 0x2d055e0] concealing 44 DC, 44 AC, 44 MV errors in I frame
 [mpeg2video @ 0x2d055e0] ac-tex damaged at 2 2300:00:20.68
 bitrate=2433.5kbits/s
 [mpeg2video @ 0x2d055e0] Warning MVs not available
 [mpeg2video @ 0x2d055e0] concealing 44 DC, 44 AC, 44 MV errors in P frame
 [mpeg2video @ 0x2d055e0] mb incr damagedB time=00:00:54.16
 bitrate=2345.7kbits/s
 [mpeg2video @ 0x2d055e0] 00 motion_type at 13 35
 [mpeg2video @ 0x2d055e0] Warning MVs not available
 [mpeg2video @ 0x2d055e0] concealing 88 DC, 88 AC, 88 MV errors in P frame
 frame= 1477 fps=321 q=2.0 Lsize=   17600kB time=00:01:00.00
 bitrate=2403.0kbits/s
 video:16107kB audio:1404kB subtitle:0kB other streams:0kB global
 headers:0kB muxing overhead: 0.511689%
 }}}
 No subtitles are visible in the output stream, ProjectX is able to export
 some data.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4855>
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