[FFmpeg-trac] #6908(ffmpeg:new): Concatenating mpegts files into stream longer than timestamp wrap can produce non-monotonic timestamps

[FFmpeg]

#6908: Concatenating mpegts files into stream longer than timestamp wrap can
produce non-monotonic timestamps
-------------------------------------+-------------------------------------
             Reporter:  calwilson    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  concatdec    |  master
  mpegts                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When concatenating multiple mpeg transport stream assets into a continuous
 mpeg transport stream, ffmpeg reports errors of non-monotonic timestamps.
 These timestamps are then changed to old_timestamp + 1 which produces an
 invalid stream.

 As far as I can tell it seems to be some interplay between the concat
 demuxer and the timestamp wrapping logic. If the timestamp is within 60s
 before the the max timestamp at a file inpoint, it triggers the subtract
 offset timestamp wrap logic which produces negative timestamps.

 I include the asset and playlist, and the ffmpeg logs.

 How to reproduce:
 {{{
 % ffmpeg -report -nostdin -hide_banner -loglevel trace -nostats -probesize
 1000000 -analyzeduration 5000000 -max_delay 0 -fflags +genpts -async 1 -f
 concat -y -i tears_playlist.ffmpeg -map 0 -c copy -copy_unknown -f mpegts
 -muxrate 1 -pcr_period 30 -pes_payload_size 50 -metadata
 service_provider=test -metadata service_name=test
 -mpegts_original_network_id 31303 -mpegts_transport_stream_id 1
 -mpegts_flags +system_b -tables_version 0 /dev/null
 ffmpeg version git master
 built on Ubuntu 16.04 LTS 64bit
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/6908>
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