[Bug 750660] New: tsdemux and push-mode not calculating

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750660

            Bug ID: 750660
           Summary: tsdemux and push-mode not calculating
    Classification: Platform
           Product: GStreamer
           Version: 1.4.4
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: iotapi322 at icloud.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 304888
  --> https://bugzilla.gnome.org/attachment.cgi?id=304888&action=edit
Does not work example log

I’m having a problem with the mpegtspacketizer.c implementation of
mpegts_packetizer_pts_to_ts



I have a HLS demuxer ( not the open source version that is available, but a
home grown one that I am working on open sourcing) that pushes TS files into
the pipeline.  On actual Set top box hardware this implementation autoplugs and
works fine.  The problem comes when I try to run it on a PC with the tsdemux in
gst-plugins-bad.

When I send the TS stream to the tsdemux,  the tsdemux does actually parse and
find the correct PTS and DTS however since I don’t have calculate_skew nor
calculate_offset set to TRUE the code flow in mpegts_packetizer_pts_to_ts
always reports back that Not enough information to calculate proper timestamp.  

Now with the exact same stream I do a filesrc  autoplugged pipeline and load
the first transport stream segment into playbin and because this is a pull src
the pipeline and the tsdemux can correctly parse and set the timestamps PTS/
DTS and play the stream.  

I’m stuck with how to actually fix this function.  I have attached two logs,
one working ( the pull source I noted from above) and the HLS demux that is a
push source that doesn’t work.



I have referenced bug 687178
https://bugzilla.gnome.org/review?bug=687178&attachment=228530

However I have the same issue with the 1.4.4 release.  Even though my demux
element sends a segment event (which should theoretically turn on
calculate_skew) it seems the tsdemux is throwing this segment information away
and calculate_skew never gets turned on.

0:00:00.185801239 20235      0x1552ca0 DEBUG                tsdemux
gbuild/src/gst-plugins-bad-1.4.4/gst/mpegtsdemux/tsdemux.c:890:push_event:<tsdemux0>
Ignoring segment event (recreated later)

I've tried commenting out the above with no change in behavior.

Any suggestions on how to proceed would be greatly appreciated.  I’m also happy
to provide any code or libraries.
Thanks,
Matt

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