[Bug 703800] New: playbin: We always request stream combiner pad sink_%u, even if another pad would be better

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703800
  GStreamer | gst-plugins-base | git

           Summary: playbin: We always request stream combiner pad
                    sink_%u, even if another pad would be better
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=248622)
 View: https://bugzilla.gnome.org/attachment.cgi?id=248622
 Review: https://bugzilla.gnome.org/review?bug=703800&attachment=248622

Patch to use `gst_element_get_compatible_pad` instead of
`gst_element_get_request_pad`

I have a situation where my stream combiner element has multiple kinds of
request pads, but playbin only uses the ones named "sink_%u", even if the caps
aren't compatible. This patch makes playbin request a compatible pad using the
caps.

I'm not sure if my reason for doing this is actually a good idea, but I think
this makes playbin better anyway.

Backwards compatibility: Since input-selector only has one kind of request pad,
with ANY caps, this doesn't change behaviour in the default case.

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