[gstreamer-bugs] [Bug 348031] New: rtpdepay does not add framerate capability

[GStreamer (bugzilla.gnome.org)]

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 GStreamer | gst-plugins-good | Ver: 0.10.3

           Summary: rtpdepay does not add framerate capability
           Product: GStreamer
           Version: 0.10.3
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: malkodan at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Please describe the problem:
rtpdepay as being a demux must set the framerate capability so other decoders
and such coming after it can enable it. AFAIK - any other demux will set the
framerate correctly.
The implications are ofcourse wider - like dropped frames and bad guessing of
frame rate like ffdec_mpeg would do.

Steps to reproduce:
1. try running the following chain in front of an rtsp connection :
gst-launch -v rtspsrc location=rtsp://RTSP_URL ! rtpmp4vdepay ! ffdec_mpeg4 !
sdlvideosink
2. All frames will be dropped by sdlvideosink, except for frames marked as
'emergency' by base sink - those frames would be accepted and displayed because
there's no other choice.



Actual results:
sdlvideosink would drop all frames because the default jitter is perhaps too
small (but reasonable) and because the frames are late - ffdec_mpeg will try to
guess an arbitrary framerate.

try adding also 'videorate' after decoding - which would yield no frames at all
:
gst-launch -v rtspsrc location=rtsp://RTSP_URL ! rtpmp4vdepay ! ffdec_mpeg4 !
videorate ! sdlvideosink

Expected results:
Expected results are for the timestamps, duration and framerate to be set
correctly by the rtpdepay family of plugins.

Does this happen every time?
Yes.

Other information:


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