[Bug 692294] New: [xvidenc] Sink pad getcaps prevents caps renegotiation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692294
  GStreamer | gst-plugins-bad | 0.10.x

           Summary: [xvidenc] Sink pad getcaps prevents caps renegotiation
    Classification: Platform
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: relek.f2 at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


After negotiating the sink pad of xvidenc to a specific caps, it refuses to
renegotiate to any other caps, e.g. with a different frame rate. This is caused
by the following part of the getcaps function in gstxvidenc.c, starting on line
990 for me:

  /* If we already have caps return them */
  if (GST_PAD_CAPS (pad))
    return gst_caps_ref (GST_PAD_CAPS (pad));

According to
http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/random/negotiation?h=0.10
, "get_caps() functions should always ignore the currently negotiated caps of a
link", which is not what is happening here. With these lines commented out, the
element successfully renegotiates to a different frame rate, and produces a
playable stream.

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