gstreamer video playback , cannot play

[aero]

Hi,

I just started with the gstreamer,  i have gone through the example they
gave in application programmers reference manual, , its for playing audio
and its works well.

I have done some study and tried to do the same with video/audio with
following code , but it does not work. and i am getting the following error.
Can someone point out mistake please.
I just dont know how to connect audio/Video pipeline.

Now playing: ../Songs/nob.ogg
Running...
Dynamic pad created, linking demuxer/decoder
Error: Internal data stream error.
Returned, stopping playback
Deleting pipeline

#include <gst/gst.h>
#include <glib.h>

static void on_pad_added (GstElement *element,GstPad *pad,gpointer data)
{
        GstPad *sinkpad;
        GstElement *decoder = (GstElement *) data;
        g_print ("Dynamic pad created, linking demuxer/decoder\n");
        sinkpad = gst_element_get_static_pad (decoder, "sink");
        gst_pad_link (pad, sinkpad);
        gst_object_unref (sinkpad);
}

static gboolean cb_print_position (GstElement *pipeline)
{
        GstFormat fmt = GST_FORMAT_TIME;
        gint64 pos, len;
        if (gst_element_query_position (pipeline, &fmt, &pos)
                && gst_element_query_duration (pipeline, &fmt, &len)) {
                g_print ("Time: %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT
"\r",
                        GST_TIME_ARGS (pos), GST_TIME_ARGS (len));
        }
        /* call me again */
        return TRUE;
}

static gboolean bus_call (GstBus *bus,GstMessage *msg,gpointer data)
{
        GMainLoop *loop = (GMainLoop *) data;
        switch (GST_MESSAGE_TYPE (msg)) {
                case GST_MESSAGE_EOS:
                        g_print ("End of stream\n");
                        g_main_loop_quit (loop);
                        break;
                case GST_MESSAGE_ERROR: {
                        gchar *debug;
                        GError *error;
                        gst_message_parse_error (msg, &error, &debug);
                        g_free (debug);
                        g_printerr ("Error: %s\n", error->message);
                        g_error_free (error);
                        g_main_loop_quit (loop);
                        break;
                }
                default:
                break;
        }
return TRUE;
}


int main (int argc, char *argv[])
{
        GMainLoop *loop;
        GstElement *pipeline, *source, *demuxer, *decoder, *conv, *sink;
        GstBus *bus;
        gst_init (&argc, &argv);

        loop = g_main_loop_new (NULL, FALSE);
        if (argc != 2) {
                g_printerr ("Usage: %s <Ogg/Vorbis filename>\n", argv[0]);
                return -1;
        }
        pipeline = gst_pipeline_new ("video-player");
        source = gst_element_factory_make ("filesrc", "file-source");
        demuxer = gst_element_factory_make ("oggdemux", "ogg-demuxer");
        decoder = gst_element_factory_make ("vorbisdec", "vorbis-decoder");
        conv = gst_element_factory_make ("autovideoconvert", "converter");
        sink = gst_element_factory_make ("autovideosink", "video-output");
        if (!pipeline || !source || !demuxer || !decoder || !conv || !sink)
{
                g_printerr ("One element could not be created. Exiting.\n");
                return -1;
        }
        g_object_set (G_OBJECT (source), "location", argv[1], NULL);
        bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
        gst_bus_add_watch (bus, bus_call, loop);
        gst_object_unref (bus);
        gst_bin_add_many (GST_BIN (pipeline),source, demuxer, decoder, conv,
sink, NULL);
        gst_element_link (source, demuxer);
        gst_element_link_many (decoder, conv, sink, NULL);
        g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
decoder);
        g_print ("Now playing: %s\n", argv[1]);

        gst_element_set_state (pipeline, GST_STATE_PLAYING);
        g_print ("Running...\n");
        g_timeout_add (200, (GSourceFunc) cb_print_position, pipeline);
        g_main_loop_run (loop);
        g_print ("Returned, stopping playback\n");
        gst_element_set_state (pipeline, GST_STATE_NULL);
        g_print ("Deleting pipeline\n");
        gst_object_unref (GST_OBJECT (pipeline));
        return 0;
}




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