[FFmpeg-trac] #10415(avformat:new): dvb teletext broken output with scodec copy after 26.5 hours

[FFmpeg]

#10415: dvb teletext broken output with scodec copy after 26.5 hours
-------------------------------------+-------------------------------------
             Reporter:  Dennis E.    |                     Type:  defect
  Mungai                             |
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  mpegts dvb   |  master
  dvb_teletext                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 How to reproduce:

 Here is a trivial example demonstrating the issue.

 This occurs with or without the use of {{{-copyts}}} and other flags:
 {{{
 ffmpeg -nostdin -analyzeduration 1000000 -fflags +genpts+igndts -threads:v
 1 -copyts -start_at_zero -copytb 1 -i
 "udp://$address:$port?fifo_size=2000000&buffer_size=500000&overrun_nonfatal=1"
 -flags -global_header -scodec copy -map 0:s -f mpegts
 "udp://$address:$port?pkt_size=1316&ttl=0"
 }}}

 This was tested on git master, and releases 4.3,4.4,5.0 and 6.0, and
 remains consistently reproducible.

 The process(es) fail with the typical log:

 {{{
 [mpegts @ 0x5561f3c23200] Non-monotonous DTS in output stream 0:0;
 previous: 8584615604, current: 25924520; changing to 8584615605. This may
 result in incorrect timestamps in the output file.
 2023-05-30T20:01:41.583981663Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615605, current: 25926742;
 changing to 8584615606. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.617813181Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615606, current: 25931209;
 changing to 8584615607. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.660480003Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615607, current: 25933454;
 changing to 8584615608. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.705600374Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615608, current: 25937898;
 changing to 8584615609. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.745257948Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615609, current: 25942354;
 changing to 8584615610. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.792956919Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615610, current: 25946798;
 changing to 8584615611. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.826549269Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615611, current: 25949043;
 changing to 8584615612. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.863288436Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615612, current: 25953499;
 changing to 8584615613. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.898381018Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615613, current: 25955721;
 changing to 8584615614. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.943112768Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615614, current: 25960176;
 changing to 8584615615. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:41.990957430Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615615, current: 25962421;
 changing to 8584615616. This may result in incorrect timestamps in the
 output file.
 [mpegts @ 0x5561f3c23200] Non-monotonous DTS in output stream 0:0;
 previous: 8584615616, current: 25966877; changing to 8584615617. This may
 result in incorrect timestamps in the output file.
 2023-05-30T20:01:42.068399496Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615617, current: 25971321;
 changing to 8584615618. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.104472785Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615618, current: 25973554;
 changing to 8584615619. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.139226689Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615619, current: 25978010;
 changing to 8584615620. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.186078743Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615620, current: 25980244;
 changing to 8584615621. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.220072406Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615621, current: 25984699;
 changing to 8584615622. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.271244514Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615622, current: 25988726;
 changing to 8584615623. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.301641546Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615623, current: 25990948;
 changing to 8584615624. This may result in incorrect timestamps in the
 output file.
 2023-05-30T20:01:42.352140743Z [mpegts @ 0x5561f3c23200] Non-monotonous
 DTS in output stream 0:0; previous: 8584615624, current: 25995404;
 changing to 8584615625. This may result in incorrect timestamps in the
 output file.
 }}}

 I've also tried setting the mpegts demuxer option {{{-fix_teletext_pts
 0}}} to no avail,with the same failure message. This option was
 highlighted in ticket #8844 as a potential workaround.

 When the "Non-monotonous DTS in output stream" warning(s) occur, the
 subtitle stream(s) are no longer accessible on the output.

 Regrettably, I cannot share the input samples for copyright reasons.

 Valid output can only be produced after restarting ffmpeg after the error
 occurs, exactly 26.5 hours later.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10415>
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