Missing sound when playing file

[longkas]

Hello,
The sound is missing after playing an mkv file for about 20 seconds.  My
pipeline decodes video and audio individually to rtp, like this

  filesrc location=av.mkv ! decodebin ! compositor ! ... ! udpsink
  filesrc location=av.mkv ! decodebin ! audiomixer ! ... ! udpsink

then I will play an SDP file by setting the right settings.

It works for many other mkv/mp4 files but not this file, the debug info
shows 6,000 lines of similar info:

0:00:33.906471062  1409 0x7f047c03c590 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux1:sink>
Unknown CueTrackPositions subelement 0xb2 - ignoring
0:00:33.906476633  1409 0x7f03f0042800 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux0:sink>
Unknown ChaptersTitles subelement 0x437c - ignoring
0:00:33.906477142  1409 0x7f047c03c590 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux1:sink>
Unknown CueTrackPositions subelement 0xf0 - ignoring
0:00:33.906482331  1409 0x7f03f0042800 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux0:sink>
Unknown ChaptersTitles subelement 0x437c - ignoring
0:00:33.906483195  1409 0x7f047c03c590 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux1:sink>
Unknown CueTrackPositions subelement 0xb2 - ignoring
0:00:33.906492194  1409 0x7f047c03c590 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux1:sink>
Unknown CueTrackPositions subelement 0xf0 - ignoring
0:00:33.906495337  1409 0x7f047c03c590 WARN    
matroskareadcommon
matroska-read-common.c:711:gst_matroska_read_common_parse_skip:<matroskademux1:sink>
Unknown CueTrackPositions subelement 0xf0 - ignoring

After my test I found:
1) play from start: no sound after 20 seconds
2) seek to 60 seconds of the file:  sound is back

What could be the issue then, please help, thank you





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[longkas]

I can reproduce this issue :

gst-launch-1.0.exe filesrc location=av.mkv ! decodebin !  audioconvert !
autoaudiosink

but the file is 7G, I dont know how to share it, I have reported a bug here
https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/443



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