[FFmpeg-trac] #6021(avcodec:closed): 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:  closed
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:  fixed
             Keywords:  utf8 mov_text  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Changes (by CoRoNe):

 * cc: rwijnsma@… (added)


Comment:

 First time I've been looking at this again in 2 years time. I believe my
 issue is different than erikbs', because this fix didn't do anything for
 me.
 Whenever I mux subtitles it will always be to a matroska container,
 because muxing mov_text in a mp4 container was problematic and after
 testing today I can say it still is.
 Ran above command again with a (obviously) newer FFmpeg binary, but now my
 Samsung Smart TV (2014) doesn't show/render any subtitles at all. My tv
 has no problems at all with the video generated by MP4Box and shows all
 subtitle lines.
 Could it be that FFmpeg doesn't fully adhere to the ISO/IEC 14496-17
 standard? There has to be a reason why my tv doesn't like the FFmpeg
 generated MP4[tx3g] files afterall.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6021#comment:17>
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