[Vala] Problem with gstreamer bin

["Spencer, Matthew" <MSpencer nds com>]

Hi Guys

 

I am playing with Vala with a view to presenting information about it at our companies developer conference in a couple of weeks.  With this in mind I am trying to build up a test application that shows video playback using GStreamer.  I am having problems with the following code:

 

private Element createVideoBin() {

  var bin=new Bin("videobin");

  var queue=ElementFactory.make("queue","queue");

  var sink=ElementFactory.make("autovideosink","videosink");

  var ghostPad=new GhostPad("sink",queue.get_pad("sink"));

  bin.add_many(queue,sink);

  queue.link(sink);

  bin.add_pad(ghost);

  return(bin);

}

 

When attempting to use the returned bin, I get a segfault.  This is because (I think, on examining the generated C code) the elements are being unrefd before the bin is returned.  I am sure this is not supposed to happen.

 

I get a number of error messaged when running the app:

(mystreamer:16361): GStreamer-CRITICAL **:

Trying to dispose of object "videosink", but it still has a parent "videobin".

You need to let the parent manage the object instead of unreffing the object directly.

 

I am assuming this is because I need to inform the code that I wish to transfer ownership of the objects to the 'Bin', but how do I do this, and is there a way that this can be picked up by the compiler to prevent this type of problem?

 

Cheers

 

Matt

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