Closed captions in mov_text in f4v

[Carl Eugen Hoyos]

Compn on irc pointed to a sample with strange subtitles, every line starts with cc608:AAAA

$ ffmpeg -i rickandmorty_cc_001_pt1_t3LEd_AS_HD_large.flv
ffmpeg version N-58470-g3c846fd Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov 26 2013 14:14:11 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      52. 55.100 / 52. 55.100
  libavcodec     55. 44.100 / 55. 44.100
  libavformat    55. 21.102 / 55. 21.102
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 91.100 /  3. 91.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rickandmorty_cc_001_pt1_t3LEd_AS_HD_large.flv':
  Metadata:
    major_brand     : f4v
    minor_version   : 0
    compatible_brands: mp42iso2isomavc1
    creation_time   : 2013-11-25 18:07:18
  Duration: 00:05:30.70, start: 0.000000, bitrate: 933 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 640x360, 799 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2013-11-25 18:07:18
      handler_name    : Video Media Handler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2013-11-25 18:07:18
      handler_name    : Sound Media Handler
    Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 640x360, 3 kb/s (default)
    Metadata:
      creation_time   : 2013-11-25 18:07:18
      handler_name    : Subtitle Handler
At least one output file must be specified

[Carl Eugen Hoyos]

Sample uploaded to ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket3172/

[compn]

the subs did not display in quicktime.

i've only seen them work in adobe flash player at adultswim.com
but they changed the url so i'm not sure how to get that player to play the sample.

[compn]

from someone that knows more about it than me: "They're essentially just base64'ing the raw cc608/cc708 data wrapped in some transport stream-type packets."