problem transmission via udp

[morning]

Hi everybody, 

After many days of research, I am having a problem that after processing
images from appsink, I do not know how to transmit via udp.
The process is as follows:
    (1)use gst_parse_launch () to get video source ==>
(2)gst_app_sink_set_callbacks () to image processor ==> (3)pass processed
video via udp (I'm using appsrc). I'm having problem at (3)

I refer from this link:
https://stackoverflow.com/questions/10403588/adding-opencv-processing-to-%20gstreamer-application

I don't know how to send the processed appsink so that appsrc can get the
data.

     appsrc = gst_element_factory_make("appsrc", "source");// appsrc --test:
videotestsrc
     conv = gst_element_factory_make("nvvidconv", "conv");// nvvidconv
--test: videoconvert
     videoenc = gst_element_factory_make("nvv4l2h264enc", "enc");//
nvv4l2h264enc --test: x264enc
     parser = gst_element_factory_make("h264parse", "parser");
     payloader = gst_element_factory_make("rtph264pay", "pay");
 
     g_object_set(G_OBJECT(payloader), "config-interval", 1, NULL);
     g_object_set(G_OBJECT(videoenc), "bitrate", 8000000, NULL);
     g_object_set(G_OBJECT(videoenc), "maxperf-enable", 1, NULL);
     g_object_set(G_OBJECT(appsrc), "caps",
             gst_caps_new_simple("video/x-raw",
                 "format", G_TYPE_STRING, "NV12",
                 "width", G_TYPE_INT, 640,
                 "height", G_TYPE_INT, 480,
                 "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
                 "framerate", GST_TYPE_FRACTION, 0, 1,
                 NULL), NULL);
     udpsink = gst_element_factory_make("udpsink", "udpsink");
     g_object_set(G_OBJECT(udpsink), "host", "192.168.22.100", NULL);
     g_object_set(G_OBJECT(udpsink), "port", 5000, NULL);
         std::cout << "set up appsrc..." << std::endl;
 
     gst_bin_add_many(GST_BIN(pipeline), appsrc, conv, videoenc, payloader,
udpsink, NULL);
 
     if (gst_element_link_many(appsrc, conv, videoenc, payloader, udpsink,
NULL) != TRUE)
     {
         return -1;
     }

Can someone help me suggest, or 1 similar example, I'm newbie with
gstreamer.

Thanks.





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