rtspsrc internal data stream error gstreamer c-appliaction - c

Question

gst-launch-1.0 rtspsrc location=rtsp://192.168.1.43:554/stream0 latency=0 name=src src. ! rtph264depay ! queue ! h264parse ! vpudec ! videoconvert ! videoscale ! waylandsink window-width=352 window-height=288
I'm trying to write the pipeline as c application. This command runs successfully. But C-application give error Error received from element udpsrc1: Internal data stream error.
Here's my c code:
#include <gst/gst.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
/* Structure to contain all our information, so we can pass it to callbacks */
typedef struct _Data {
GstElement *pipeline;
GstElement *source;
GstElement *videoQueue;
GstElement *videoParser;
GstElement *videoDepayloader;
GstElement *videoDecoder;
GstElement *videoSink;
GstElement *videoConvert;
GstElement *videoScale;
} Data;
int main(int argc, char *argv[]) {
Data data;
GstBus *bus;
GstMessage *msg;
GstPad *pad;
gboolean terminate = FALSE;
GstStateChangeReturn ret;
/* Initialize GStreamer */
gst_init (NULL,NULL);
data.source = gst_element_factory_make ("rtspsrc", "source");
data.videoQueue = gst_element_factory_make ("queue", "videoQueue");
data.videoDepayloader = gst_element_factory_make ("rtph264depay", "videoDepayloader");
data.videoDecoder = gst_element_factory_make ("vpudec", "videoDecoder");
data.videoSink = gst_element_factory_make ("waylandsink", "videoSink");
data.videoParser = gst_element_factory_make("h264parse", "videoParser");
data.videoConvert = gst_element_factory_make("videoconvert", "video-convert");
data.videoScale = gst_element_factory_make("videoscale", "videoScale");
/* Create the empty pipeline */
data.pipeline = gst_pipeline_new ("rtsp-pipeline");
if (!data.source) {
g_printerr ("source elements could be created.\n");
return -1;
}
if(!data.videoQueue){
g_printerr ("videoQueue elements could be created.\n");
return -1;
}
if(!data.videoDepayloader){
g_printerr ("videoDepayloader elements could be created.\n");
return -1;
}
if(!data.videoDecoder){
g_printerr ("videoDecoder elements could be created.\n");
return -1;
}
if(!data.videoSink){
g_printerr ("videoSink elements could be created.\n");
return -1;
}
if(!data.videoParser){
g_printerr ("videoParser elements could be created.\n");
return -1;
}
if(!data.videoConvert){
g_printerr ("videoConvert elements could be created.\n");
return -1;
}
if(!data.videoScale){
g_printerr ("videoScale elements could be created.\n");
return -1;
}
/* Configure elements */
g_object_set(data.source, "location", "rtsp://192.168.1.43/h264cif", NULL);
g_object_set(data.source, "latency", 0, NULL);
gst_bin_add_many (GST_BIN (data.pipeline), data.source, data.videoDepayloader, data.videoQueue, data.videoParser, data.videoDecoder, data.videoConvert, data.videoScale, data.videoSink, NULL);
//GST_DEBUG=4 gst-launch-1.0 rtspsrc location=rtsp://192.168.1.43:554/stream0 latency=0 name=src src. ! rtph264depay ! queue ! h264parse ! vpudec ! videoconvert ! videoscale ! waylandsink window-width=352 window-height=288
if (!(gst_element_link_many(data.videoDepayloader, data.videoQueue,
data.videoParser, data.videoDecoder,
data.videoScale, data.videoConvert, data.videoSink, NULL)))
{
g_printerr("Error linking fields... \n");
exit (-1);
}
/* Start playing */
ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_print ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (data.pipeline);
exit(1);
}
/* Listen to the bus */
bus = gst_element_get_bus (data.pipeline);
do {
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Parse message */
if (msg != NULL) {
GError *err;
gchar *debug_info;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:
gst_message_parse_error (msg, &err, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
g_clear_error (&err);
g_free (debug_info);
terminate = TRUE;
break;
case GST_MESSAGE_EOS:
g_print ("End-Of-Stream reached.\n");
terminate = TRUE;
break;
case GST_MESSAGE_STATE_CHANGED:
/* We are only interested in state-changed messages from the pipeline */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data.pipeline)) {
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
g_print ("Pipeline state changed from %s to %s:\n",
gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
}
break;
default:
/* We should not reach here */
g_printerr ("Unexpected message received.\n");
break;
}
gst_message_unref (msg);
}
} while (!terminate);
/* Free resources */
gst_object_unref (bus);
gst_element_set_state (data.pipeline, GST_STATE_NULL);
gst_object_unref (data.pipeline);
return 0;
}

Answer 1

It seems like you did not link your source element:
gst_element_link_many(data.source, data.videoDepayloader, /* ... */ ,NULL)
And be sure to link the elements in the same order as your command line pipeline.