gstreamer and appsrc, not working

gistfile1.txt

using System;
using System.IO;
using System.Linq;
using Gst;
using Gst.App;
using Application = Gst.Application;
using DateTime = System.DateTime;

namespace gstreamer
{
    class Playback
	{
	    public static void Main(string[] args)
	    {
	        var path = Environment.GetEnvironmentVariable("PATH");
	        Environment.SetEnvironmentVariable("PATH", @"c:\gstreamer\1.0\x86_64\bin;" + path);
	        Environment.SetEnvironmentVariable("GST_DEBUG", "3");

            Application.Init(ref args);

	        var pipeline = new Pipeline("pipe1");

	        var bmpFiles = Directory.GetFiles(@"c:\bmp", "*.bmp").ToList();
            var bmpFilesSent = 0;
            
            var appsrc = new Gst.App.AppSrc("app_src");
            appsrc.Caps = Caps.FromString("image/bmp,framerate=0/1,width=900,height=374");
            appsrc.StreamType = AppStreamType.Stream; // No seeking
            appsrc.Format = Format.Time;
            appsrc.DoTimestamp = true;

	        var avdecbmp = ElementFactory.Make("avdec_bmp");
            var videoconvert = ElementFactory.Make("videoconvert");
	        var queue = ElementFactory.Make("queue");
            var videosink = ElementFactory.Make("autovideosink");
            
            pipeline.Add(appsrc, avdecbmp, videoconvert, queue, videosink);
            if (!Element.Link(appsrc, avdecbmp, videoconvert, queue, videosink))
                return;

            var bus = pipeline.Bus;
            bus.AddSignalWatch();
	        var mainLoop = new GLib.MainLoop();

            bus.Connect("message::error", (o, signalArgs) =>
            {
                    GLib.GException err;
                    string debug;
                    var msg = (Message)signalArgs.Args[0];

                    // Print error details on the screen
                    msg.ParseError(out err, out debug);
                    Console.WriteLine("Error received from element {0}: {1}", msg.Src.Name, err.Message);
                    Console.WriteLine("Debugging information: {0}", debug != null ? debug : "none");

                    mainLoop.Quit();
            });
            bus.Connect("message::eos", (o, signalArgs) =>
            {
                mainLoop.Quit();
            });

	        System.DateTime startedTimer = DateTime.Now;
	        DateTime lastTimer = DateTime.Now;
            uint idleId = 0;

            appsrc.NeedData += (o, dataArgs) =>
	        {
	            if (idleId == 0)
	                idleId = GLib.Idle.Add(() =>
	                {
	                    if (bmpFilesSent == 0 || (System.DateTime.Now - lastTimer) > new TimeSpan(0, 0, 0, 0, 40))
	                    {
	                        var buf = new Gst.Buffer(File.ReadAllBytes(bmpFiles.First()));
	                        bmpFiles.RemoveAt(0);

	                        var ret = appsrc.PushBuffer(buf);
	                        buf.Dispose();
	                        ++bmpFilesSent;
	                        lastTimer = System.DateTime.Now;

	                        if (ret != FlowReturn.Ok)
	                            return false;
	                    }
	                    return true;
	                });
	        };
	        appsrc.EnoughData += (sender, eventArgs) =>
	        {
	            if (idleId != 0)
	            {
	                GLib.Idle.Remove(idleId);
	                idleId = 0;
	            }
	        };

            pipeline.SetState(State.Playing);
            mainLoop.Run();

            // Free resources
            pipeline.SetState(State.Null);
        }
    }
}