gstreamer crashes after NewDecodedPad

[Mirko]

hi all,

i just translated a python app to dotnet but even if i translate the code
line by line, it crashes after NewDecodedPad. 
I already wrote a little player using playbin2 for to ensure, gstreamer
works with .net 2008 without getting any problem.
does anybody have a hint what could have gone wrong here ?

thank you in advance !

        private void button1_Click(object sender, EventArgs e)
        {
            Gst.Application.Init();
            Gst.BasePlugins.DecodeBin2 decodebin2;
            playerApp.player = new Pipeline("player");
            playerApp.source = new Gst.App.AppSrc("source");
            playerApp.source.NeedData += new
Gst.App.NeedDataHandler(appsrc_NeedData);
            decodebin2 =
(Gst.BasePlugins.DecodeBin2)ElementFactory.Make("decodebin2", "decodebin2");
            decodebin2.NewDecodedPad += new
Gst.BasePlugins.DecodeBin2.NewDecodedPadHandler(decodebin2_NewDecodedPad);

            playerApp.audiosink = ElementFactory.Make("autoaudiosink",
"audio-output");
            playerApp.videosink = ElementFactory.Make("glimagesink",
"video-output") as Gst.Video.VideoSink;
            playerApp.queue_a = ElementFactory.Make("queue", "queue_a");
            playerApp.queue_v = ElementFactory.Make("queue", "queue_v");

            playerApp.player.Add(playerApp.source, decodebin2,
playerApp.audiosink, playerApp.videosink, playerApp.queue_a,
playerApp.queue_v, null);

            Element.Link(playerApp.source, decodebin2);
            Element.Link(playerApp.queue_v, playerApp.videosink);
            Element.Link(playerApp.queue_a, playerApp.audiosink);
            
            playerApp.player.Bus.AddSignalWatch();
            playerApp.player.Bus.SyncMessage += new
SyncMessageHandler(Bus_SyncMessage);
            playerApp.player.Bus.Message += new MessageHandler(Bus_Message);

            playerApp.player.SetState(Gst.State.Playing);
        }

        void decodebin2_NewDecodedPad(object o,
Gst.BasePlugins.DecodeBin2.NewDecodedPadArgs args)
        {
            //caps = pad.get_caps()[0].get_name()
            //if caps.startswith('video'):
            //    #print 'setting video pad'
            //    pad.link(self.queuev.get_pad("sink"))
            //elif caps.startswith('audio'):
            //    #print 'setting audio pad'
            //    pad.link(self.queuea.get_pad("sink"))

            Caps caps = args.Pad.Caps;
            if (caps.ToString().Contains("video"))
            {
                // after linking this pad, it crashes
                Pad p = playerApp.queue_v.GetStaticPad("sink");
                if (p.IsLinked)
                    return;
                args.Pad.Link(p);
            }
            else
            {
                Pad p = playerApp.queue_a.GetStaticPad("sink");
                if (p.IsLinked)
                    return;
                args.Pad.Link(p);
            }
        }

        void appsrc_NeedData(object o, Gst.App.NeedDataArgs args)
        {
            // this is called 2x (ok)
            string s = lstSegments.Dequeue();
            if (s == null) return;
            byte[] data = File.ReadAllBytes(s);
            Gst.Buffer buffer = new Gst.Buffer(data);
            playerApp.source.PushBuffer(buffer);
        }

        void Bus_SyncMessage(object o, SyncMessageArgs args)
        {
            if (args.Message.Structure.Name.Contains("prepare-xwindow"))
            {
                Gst.Interfaces.XOverlayAdapter overlayAdapter = new
Gst.Interfaces.XOverlayAdapter(playerApp.videosink.Handle);
                overlayAdapter.XwindowId = (ulong)this.Handle;
            }
        }

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