[Bug 772141] New: videorate: negotiation failure with input rate 0/1 drop-only=true and downstream capsfilter

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772141

            Bug ID: 772141
           Summary: videorate: negotiation failure with input rate 0/1
                    drop-only=true and downstream capsfilter
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: t.i.m at zen.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Only happens with drop-only=true.

Reproduce with:

$ gst-launch-1.0 videotestsrc num-buffers=50 ! vp8enc ! matroskamux ! filesink
location=/tmp/foo.mkv

$ gst-launch-1.0 filesrc location=/tmp/foo.mkv ! decodebin ! videorate
drop-only=false ! video/x-raw,framerate=1/5 ! fakesink 

 --> works

$ gst-launch-1.0 filesrc location=/tmp/foo.mkv ! decodebin ! videorate
drop-only=true ! video/x-raw,framerate=1/5 ! fakesink 

 --> not-negotiated error

(Let's ignore for now the fact that matroskamux/matroskdemux encode a rate of
0/1 here.)

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