[FFmpeg-trac] #7855(avformat:reopened): Last subtitle in MP4 is displayed forever

FFmpeg trac at avcodec.org
Fri Apr 19 04:49:22 EEST 2019


#7855: Last subtitle in MP4 is displayed forever
-------------------------------------+-------------------------------------
             Reporter:  fumoboy007   |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mp4,         |               Blocked By:
  mov_text                           |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by fumoboy007):

 Replying to [comment:9 mkver]:
 > ISO/IEC 14496-17 is absolutely uninformative for this question:\\
 > "[T]o  each  text  access  unit  a  single  time  stamp  applies. The
 time stamp assigned to a text access unit indicates the time at which the
 text access unit is to be presented  on  the  display."
 >
 > And the reason for this is that the carriage of timed text in mp4 is
 actually described in 14496-30, a document which doesn't seem to be
 available for free.

 Ah! Does this [https://mpeg.chiariglione.org/standards/mpeg-4/timed-text-
 and-other-visual-overlays-iso-base-media-file-format/isoiec-14496-30
 draft] have enough information?

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Ticket URL: <https://trac.ffmpeg.org/ticket/7855#comment:10>
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