Unable to link rtspsrc and tee

[Nicolas Dufresne]

Le dimanche 17 novembre 2019 à 10:24 -0600, shyam a écrit :
> Hi Nicolas,
> 
>               I am very new to Gstreamer. I am trying to learn using
> examples available in the net. The use-case I want to implement requires
> display of live video streaming via RTSP and recording simultaneously in
> metroska (mkv) format.Any guidance in this will be of great help.I still
> need to get familiar with Gstreamer.
> 
> 
> I got this code from internet. This works fine with source being
> videotestsrc, but doesnot work with rtspsrc.
> int main(int argc, char *argv[])
> {
> 	/*******************************/
> 	if (!gst_debug_is_active()) {
> 		gst_debug_set_active(TRUE);
> 		GstDebugLevel dbglevel = gst_debug_get_default_threshold();
> 		if (dbglevel < GST_LEVEL_ERROR) {
> 			dbglevel = GST_LEVEL_ERROR;
> 			gst_debug_set_default_threshold(dbglevel);
> 		}
> 	}
> 	/*********************************/
> 	//signal(SIGINT, sigintHandler);
> 	gst_init(&argc, &argv);
> 
> 	pipeline = gst_pipeline_new(NULL);
> 
> 	src = gst_element_factory_make("rtspsrc", NULL);
> 	g_object_set(src, "location", "rtsp://location", NULL);
> 
> 	tee = gst_element_factory_make("tee", "tee");
> 
> 	encoder = gst_element_factory_make("x264enc", NULL);
> 	muxer = gst_element_factory_make("matroskamux", NULL);
> 	filesink = gst_element_factory_make("filesink", NULL);
> 	videoconvert = gst_element_factory_make("videoconvert", NULL);
> 	videosink = gst_element_factory_make("autovideosink", NULL);
> 	queue_display = gst_element_factory_make("queue", "queue_display");
> 	queue_record = gst_element_factory_make("queue", "queue_record");
> 
> 	if (!pipeline || !src || !tee || !encoder || !muxer || !filesink ||
> !videoconvert || !videosink || !queue_record || !queue_display) {
> 		g_error("Failed to create elements");
> 		return -1;
> 	}
> 
> 	g_object_set(filesink, "location", "rec.mkv", NULL);
> 	g_object_set(encoder, "tune", 4, NULL); /* important, the encoder usually
> takes 1-3 seconds to process this. Queue buffer is generally upto 1 second.
> Hence, set tune=zerolatency (0x4) */
> 
> 	gst_bin_add_many(GST_BIN(pipeline), src, tee, queue_record, encoder, muxer,
> filesink, queue_display, videoconvert, videosink, NULL);
> 	if (!gst_element_link_many(src, tee, NULL)
> 		|| !gst_element_link_many(tee, queue_record, encoder, muxer, filesink,
> NULL)
> 		|| !gst_element_link_many(tee, queue_display, videoconvert, videosink,
> NULL)
> 		) {
> 		g_error("Failed to link elements");
> 		return -2;

Normally things should fail here.  rtspsrc have "sometimes" pad. See
[0] for more details. Another hint I'm giving you in advance, the
media-type coming out of rtspsrc is something like application/x-rtp,
while the videoconvert / encoder that you have after your tee wants
video/x-raw. Consider depayloading and decoding the stream first. As an
alternative, you may want to use uridecodebin instead of rtspsrc
directly.

[0] https://gstreamer.freedesktop.org/documentation/application-development/basics/pads.html?gi-language=c

> 	}
> 
> 	loop = g_main_loop_new(NULL, FALSE);
> 
> 	bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
> 	gst_bus_add_signal_watch(bus);
> 	g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(message_cb), NULL);
> 	gst_object_unref(GST_OBJECT(bus));
> 
> 	gst_element_set_state(pipeline, GST_STATE_PLAYING);
> 
> 	g_print("Starting loop");
> 	g_main_loop_run(loop);
> 
> 	return 0;
> }
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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