[FFmpeg-trac] #3689(ffprobe:new): ffprobe identifies caption track as subtitle

[FFmpeg]

#3689: ffprobe identifies caption track as subtitle
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  JerryScoggins                      |                 Priority:  normal
               Status:  new          |                  Version:
            Component:  ffprobe      |  unspecified
             Keywords:  caption      |               Blocked By:
  subtitle                           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 When I run the latest ffprobe on a QuickTime movie that contains a track
 of type 'clcp' the output from ffprobe says it's a subtitle track, which
 is incorrect.  In QuickTime, Closed Captioning tracks have the type
 'clcp', and Subtitle tracks have a type of 'sbtl' as documented in two
 sections of this page:
 https://developer.apple.com/library/mac/documentation/QuickTime/qtff/QTFFChap3/qtff3.html#//apple_ref/doc/uid/TP40000939-CH205-SW87

 The terms Closed Captioning and Subtitles are often used interchangeable,
 probably due to the way they're presented to the user but they are
 actually quite different in most every other aspect.

 For a good explanation of the differences between closed captioning and
 subtitle's, I would suggest Jason's overview at this URL:
 https://cpcweb.zendesk.com/entries/25142571-Closed-Captions-vs-Subtitles

 If you need sample media, or additional details, please ask.

 Thank you,
 Jerry Scoggins

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3689>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker