[Bug 703405] New: playbin: stream-combiners can't be bins

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703405
  GStreamer | gst-plugins-base | git

           Summary: playbin: stream-combiners can't be bins
    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: ---


In playbin's `pad_added_cb`, we do this to get sink pads from the stream
combiners:

    sinkpad = gst_element_get_request_pad (combine->combiner, "sink_%u")

The problem is that if `combine->combiner` is a bin, then it will always return
NULL.

These pipelines both stall because of this:

    gst-launch-1.0 playbin
uri='https://dl.dropboxusercontent.com/s/x03ogh3epbd6lfq/example.mkv?token_hash=AAGW4CSrXYj9fNjD0CpO465zuXLRY0WEXcUy2lxQ5IOYJg&dl=1'
audio-stream-combiner="adder"

    gst-launch-1.0 playbin
uri=http://ftp.nluug.nl/ftp/graphics/blender/apricot/trailer/Sintel_Trailer1.480p.DivX_Plus_HD.mkv
text-stream-combiner="funnel"

This can be worked around in normal usage, but it's fairly annoying that the
stream combiners can't be used in gst-launch.

I'm not sure the best way to handle this though. Iterating through the elements
in the bin until I find out that will give me a pad? Requesting sink pads from
the first element and the src pad from the last? :\

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