[Bug 758169] New: rtph264depay should translate "a-framerate (string)" attribute to "framerate (fraction)" on certain cameras

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758169

            Bug ID: 758169
           Summary: rtph264depay should translate "a-framerate (string)"
                    attribute to "framerate (fraction)" on certain cameras
    Classification: Platform
           Product: GStreamer
           Version: 1.4.4
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jspurny at seznam.cz
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When playing h264 streams from Sony SNC-VB600 and FLIR FC-690-PAL cameras, the
rtph264depay will receive caps containing "a-framerate" attribute, which
contains string value, for example "12.0", but rtph264depay does not recognize
it and reports "framerate=(fraction)0/1" on src pad, so the whole pipeline
downstream has "0/1" framerate, which means "variable bitrate" according to
documentation.

I believe that rtph264depay could translate the nonstandard "a-framerate" to
"framerate", so the caps downstream would report correct framerate when it is
in fact known, instead of reporting a variable framerate (0/1), which is not
true.

If someone has access to cameras mentioned above (and I think it's safe to
assume that probably all contemporary Sony and FLIR cameras will exhibit the
same behaviour), you can check using simple pipeline:

    gst-launch-1.0 rtspsrc location=rtsp://<addr> ! decodebin ! xvimagesink

This is the log record where "a-framerate" is first mentioned:

    DEBUG rtspsrc gstrtspsrc.c:1892:gst_rtspsrc_sdp_attributes_to_caps: adding
caps: a-framerate=12.0


and from there, every other element has "framerate=0/1" in caps.

For additional info, see bug 758023

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