[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.
[https://drive.google.com/file/d/1J90X1zlzQf-LiMwBTnMs-
HcCwiFjtHG7/view?usp=sharing].
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
"udp://239.200.0.1:1231?pkt_size=1316"
}}}
In order to "watch" the issue I recommend watching the output using either
VLC or MPV using the link "udp://@239.200.0.1:1231".
----
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
"udp://239.200.0.1:1231?pkt_size=1316"
}}}
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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