[Bug 784094] New: gst-rtsp-server: huge delay for the client to connect sometimes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784094

            Bug ID: 784094
           Summary: gst-rtsp-server: huge delay for the client to connect
                    sometimes
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-rtsp-server
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: julien.isorce at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Aproximatively 1 time over 100, the client can take up to 1 min to connect.

I found this is a regression introduced by a old commit
https://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=852cc09f542af5cadd79ffd7fe79d6475cf57e14

I noticed that the seqnum retrieved from the udpsink can be totally wrong, for
example it will be 40000 whereas the seqnum from the payloader is 100.
Most of the time these 2 values are very close, i.e. the diff is around 10 or
20 at maximum.

I suspect that the last-sample is just obsolete, from a previous run or
something, just a guess.
I am not sure what would be the best way to check the validity of this
last-sample, I tought the gstbasesink would clear it when restarting or
something like that.

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