Why the video not play when I link decodebin with xvimagsink?

[DBOYaoao]

HI ALL:

    I use decodebin2 's dynmic pad  to link with xvimagesink,but the video
not play,I only see the first frame of file!
This is the code:
    void cb_newpad (GstElement* decodebin,GstPad* pad,gpointer user_data)
{
    printf("add new pad\n");
    GstPad *audiopad;
    GstPad *videopad;
    GstCaps *caps;
    GstStructure *str;

    audiopad = gst_element_get_static_pad (audiosink, "sink");
    if (GST_PAD_IS_LINKED (audiopad)) {
        printf("audio has linked\n");
    g_object_unref (audiopad);
    return;
    }
    videopad = gst_element_get_static_pad (videosink, "sink");
    if (GST_PAD_IS_LINKED (videopad)) {
         printf("video has linked\n");
    g_object_unref (videopad);
    return;
    }
    //caps = gst_pad_query_caps(pad, NULL);
    //

    caps = gst_pad_get_caps(pad);
    str = gst_caps_get_structure (caps, 0);
    if (g_strrstr (gst_structure_get_name (str), "audio")) {
        gst_caps_unref (caps);

        if(gst_pad_link (pad, audiopad) != 0)
        {
            printf("link video error\n");
        }
        gst_object_unref (audiopad);

    }
    else if(g_strrstr (gst_structure_get_name (str), "video"))
    {
        gst_caps_unref (caps);

        if(gst_pad_link(pad,videopad) !=0)
        {
            printf("link video error\n");
        }
        gst_object_unref (videopad);
    }

#if 0
    gst_caps_unref (caps);
    gst_object_unref (audiopad);
    return;
    gst_caps_unref (caps);
#endif

}



int main(int argc,char **argv)
{
    gst_init(&argc,&argv);
    loop = g_main_loop_new(NULL, FALSE);
    pipeline = gst_pipeline_new ("video-player");
    src = gst_element_factory_make("filesrc", "file-source");
    decode = gst_element_factory_make("decodebin2", "video-dec");
    g_signal_connect (decode, "pad-added", G_CALLBACK (cb_newpad), NULL);
    videosink = gst_element_factory_make("xvimagesink", "video-output");
    audiosink = gst_element_factory_make("alsasink","audio-output");
    bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
    bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
    gst_object_unref (bus);
    if (!pipeline || !src || !decode || !videosink || !audiosink ) {
        g_printerr ("One element could not be created. Exiting.\n");
        return -1;
    }

    g_object_set (G_OBJECT (src), "location", argv[1], NULL);

    gst_bin_add_many (GST_BIN (pipeline),src, decode, videosink,audiosink,
NULL);
    if(!gst_element_link (src, decode))
    {
        printf("link src and decode error\n");
        return 0;
    }
   // gst_element_link_many (src,decode,NULL);


    gst_element_set_state (pipeline, GST_STATE_PLAYING);
    g_print ("Running...\n");
    g_main_loop_run (loop);

    return 0;
}

Thanks for your help!!



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