[FFmpeg-trac] #1845(avformat:open): Encoded movies with mov_text subtitles do not play with QT Player

[FFmpeg]

#1845: Encoded movies with mov_text subtitles do not play with QT Player
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             Reporter:  Atarikid      |                    Owner:
                 Type:  defect        |                   Status:  open
             Priority:  normal        |                Component:  avformat
              Version:  git-master    |               Resolution:
             Keywords:  mov mov_text  |               Blocked By:
             Blocking:                |  Reproduced by developer:  1
Analyzed by developer:  0             |
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Comment (by philipl):

 It sounds like the player is, at least to some extent, respecting the text
 formatting and positioning flags in the header - which no other player I'm
 aware of does. That's why I was never able to test this.

 We used a fixed style which should yield "12 point Serif white-on-
 transparent" with undefined positioning. This could easily lead to
 invisible subtitles due to the lack of positioning information, or
 misplaced subtitles (top left corner?).

 The only thing that really surprises me is the red colour. I know I didn't
 mess that up.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1845#comment:13>
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