[Bug 721100] New: App Dev Manual: Dynamically Changing the Pipeline example hangs

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721100
  GStreamer | documentation | git

           Summary: App Dev Manual: Dynamically Changing the Pipeline
                    example hangs
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: documentation
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: todd at agulnick.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=264910)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=264910)
Code from "Dynamically Changing the Pipeline"

When running the example included here:

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html

... the code always gets stuck with the warning like the following:

basetransform
gstbasetransform.c:2130:gst_base_transform_handle_buffer:<vertigotv0> could not
get buffer from pool: flushing

... after which all processing appears to cease, though the program keeps
running.

I don't know whether the problem is in the code sample provided with the
documentation or whether there's really a bug in gstreamer core. But this seems
to be the key example available for reconfiguring a running pipeline, so it's
probably important to anyone who's trying to learn how to do this (including
me!)

I've included the code from the referenced chapter as an attachment.

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