[Bug 762924] New: interlace: negotiation fails unexpectedly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762924

            Bug ID: 762924
           Summary: interlace: negotiation fails unexpectedly
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hfink at toolsonair.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The following launch-line fails with a negotiation error: 

gst-launch-1.0 videotestsrc is-live=TRUE ! capsfilter
caps="video/x-raw,framerate=50/1,interlace-mode=progressive" ! interlace
field-pattern=0 ! capsfilter
caps="video/x-raw,framerate=25/1,interlace-mode=interleaved" ! fakesink

Looking at the debug log, you'll find the following conflict:

0:00:00.076040227  1195      0x109aa00 DEBUG               GST_CAPS
gstpad.c:2192:gst_pad_link_check_compatible_unlocked:<interlace0:src> src caps
video/x-raw, framerate=(fraction)50/1, interlace-mode=(string)interleaved,
format=(string){ I420, YV12, YUY2, UYVY, AYUV, Y42B, Y444, NV12, NV21 },
width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ]
0:00:00.076044830  1195      0x109aa00 DEBUG               GST_CAPS
gstpad.c:2194:gst_pad_link_check_compatible_unlocked:<capsfilter1:sink> sink
caps video/x-raw, framerate=(fraction)25/1, interlace-mode=(string)interleaved
0:00:00.076048207  1195      0x109aa00 DEBUG               GST_CAPS
gstpad.c:2212:gst_pad_link_check_compatible_unlocked: caps are not compatible

It is strange that interlace reports a frame rate of 50/1 here, and the above
launch-line shouldn't fail to negotiate.

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