[FFmpeg-trac] #6021(avcodec:new): tx3g / mov_text subtitles are not encoded correctly in some specific cases

[FFmpeg]

#6021: tx3g / mov_text subtitles are not encoded correctly in some specific cases
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             Reporter:  erikbs         |                    Owner:
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  utf8 mov_text  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by CoRoNe):

 When can I expect this patch to be integrated?
 I'm asking because I'm having a somewhat similar situation.

 Recently I found out that my Samsung Smart TV (2014) doesn't like tx3g
 subtitle-streams generated by FFMpeg. Whenever I mux subtitles as tx3g
 with `-c:s mov_text`, Media Player Classic - HC on my pc never has any
 problems rendering them, but my tv does. Each time I start such a video
 generated by FFMpeg, lines only randomly appear.
 If I generate the same video with MP4Box, then all lines appear normally
 on my tv.
 Before I encountered this issue I've tried `-fix_sub_duration` and several
 `-movflags`-options, but all to no avail.

 I'd like to see if //erikbs//'s suggested patch could also fix my issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6021#comment:9>
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