[Bug 750032] New: videorate: fails to renegotiate on streams with a variable framerate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750032

            Bug ID: 750032
           Summary: videorate: fails to renegotiate on streams with a
                    variable framerate
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: george.kiagiadakis at collabora.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 304155
  --> https://bugzilla.gnome.org/attachment.cgi?id=304155&action=edit
Patch that solves the issue

When a stream has a variable framerate, videorate calculates it and forces it
on the output caps. However, the code in _transform_caps() currently also does
that if the transform is going in the opposite direction (GST_PAD_SRC), so
during a renegotiation it tries to force upstream to use the calculated
framerate and it fails.

The attached patch solves this issue.

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