[FFmpeg-trac] #8889(undetermined:new): mpegts with dvb_subtitle on udp output broken?

FFmpeg trac at avcodec.org
Sun Sep 13 01:40:30 EEST 2020

#8889: mpegts with dvb_subtitle on udp output broken?
             Reporter:  barhom       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  mpegts       |               Blocked By:
  dvb_subtitle                       |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 ''Summary of the bug:
 Input video has dvb_subtitles;
 Use mpegts muxer and copy subtitles to output using udp;
 The output is bad.

 Does not happen when outputting to file instead of udp. And it does not
 happen if you choose to omit the subtitles.

 How to reproduce:
 Unfortunately I could not make the test file small and still present the
 issue. The input.ts file you need to download is 53M.

 The following reproduces the bug.
 ffmpeg -re -i "input.ts" -c copy -map 0:v -map 0:a:0 -map 0:s:0 -f mpegts

 In order to "watch" the issue I recommend watching the output using either
 VLC or MPV using the link "udp://@".


 Should you choice to remove the subtitles like this,
 ffmpeg -re -i "input.ts" -c copy -map 0:v -map 0:a:0 -f mpegts

 The issue will not present itself.


 You might want to remove the "-re" and record the multicast using the
 "multicat" tool back to file if you need to investigate further.

Ticket URL: <https://trac.ffmpeg.org/ticket/8889>
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