[Bug 758319] New: rtsp-server: Seeking often hangs forever, waiting for prerolling to happen again

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758319

            Bug ID: 758319
           Summary: rtsp-server: Seeking often hangs forever, waiting for
                    prerolling to happen again
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-rtsp-server
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

After a seek, gst-rtsp-server waits for the media to preroll again... that is
for async-done. However this is often not posted as there are some NO_PREROLL
elements in the media pipeline (RTCP udpsrc for example) even if the media
itself is not live (e.g. coming from a file). GstBin is going to ignore
async-start in such cases and never post async-done, so gst-rtsp-server just
waits forever.

This does not happen during the initial prerolling as the live elements seem to
be all in locked-state, so their state is not changed yet, NO_PREROLL is not
returned and GstBin thinks everything is not live.

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