[gstreamer-bugs] [Bug 617868] New: [decodebin2] Option to remove elements from unknown streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=617868
  GStreamer | gst-plugins-base | git

           Summary: [decodebin2] Option to remove elements from unknown
                    streams
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Currently, when a stream doesn't match any of the final caps, decodebin2 will:
* emit a missing-plugin message
* emit a unknown-stream signal
* expose the pad

We should have a boolean property on decodebin2 so that if a stream is not
decodable to one of the final caps it:
* does not emit the 'unknown-stream' signal
* removes all elements corresponding to that stream in the decode group.

Ideally, we should also be able to detect whether the stream is of unknown-type
not because we're missing a decoder, but because the final caps have been
modified to only allow a subset (like only audio/x-raw-int;audio/x-raw-float
for example), in which case we should not emit the missing-plugin message
either.

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