[Bug 733916] New: Simple pipeline with textoverlay and fakesink fails to negotiate

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733916
  GStreamer | gst-plugins-base | 1.4.0

           Summary: Simple pipeline with textoverlay and fakesink fails to
                    negotiate
    Classification: Platform
           Product: GStreamer
           Version: 1.4.0
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: gnome at williammanley.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The following command fails:

    gst-launch-1.0 videotestsrc num-buffers=50 ! textoverlay ! fakesink

with the error:

    ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: 
    Internal data flow error.
    Additional debug info:
    gstbasesrc.c(2933): gst_base_src_loop (): 
    /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
    streaming task paused, reason not-negotiated (-4)

Given the simple nature of the pipeline it seems like it ought to succeed.

I suspect that this is due to the new `GstVideoOverlayComposition` mechanism
recently added to GStreamer.  This is all a little odd as adding an identity
element is enough to make it work:

    gst-launch-1.0 videotestsrc num-buffers=50 ! identity ! textoverlay !
fakesink

This is will GStreamer 1.4.0 with the Debian provided packages on my Debian
testing machine.

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