Simple RTSP Pipeline Works with gst-launch But Not with API

[Zheng]

*Thang you in advance!*

*This is the working gst-launch-1.0 pipeline.*

gst-launch-1.0 rtspsrc port-range=5000-5100
location=rtsp://192.168.1.10:8555/right latency=0 ! decodebin ! videoconvert
! video/x-raw,width=640,height=480,format=YUY2 ! autovideosink

*The following is the NOT working C function.*

int startPipeline(const char *vs_location) {
	GstElement *pipeline;
	GstBus *bus;
	guint bus_watch_id;

	gst_init(NULL, NULL);
	pipeline = gst_pipeline_new("my_pipeline");
	bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
	bus_watch_id = gst_bus_add_watch(bus, bus_callback, NULL);
	gst_object_unref(bus);

	GstElement *source, *dec_bin, *v_conv, *sink;
	source = gst_element_factory_make("rtspsrc", "source");
	dec_bin = gst_element_factory_make("decodebin", "dec_bin");
	v_conv = gst_element_factory_make("videoconvert", "v_con");
	sink = gst_element_factory_make("autovideosink", "sink");
	gst_bin_add_many(GST_BIN(pipeline), source, dec_bin, v_conv, sink, NULL);

	// Set element properties.
	g_object_set(G_OBJECT(source), "port-range", "5000-5100", NULL);
	g_object_set(G_OBJECT(source), "location", vs_location, NULL);
	g_object_set(G_OBJECT(source), "latency", 0, NULL);

	gst_element_link_many(source, dec_bin, v_conv, NULL);

	GstCaps *caps;
	caps = gst_caps_new_simple(
			"video/x-raw",
			"width", G_TYPE_INT, 640,
			"height", G_TYPE_INT, 480,
			"format", G_TYPE_STRING, "YUY2",
			NULL);
	gst_element_link_filtered(v_conv, sink, caps);
	gst_caps_unref(caps);

	gst_element_set_state(pipeline, GST_STATE_PLAYING);

	loop = g_main_loop_new(NULL, FALSE);
	g_main_loop_run(loop);

	// Clean up.
	gst_element_set_state(pipeline, GST_STATE_NULL);
	gst_object_unref(pipeline);
	g_source_remove(bus_watch_id);
	g_main_loop_unref(loop);

	return 0;
}

*Then the Errors are here.*

0:00:00.442295071 16407 0x7f007c01e940 FIXME                default
gstutils.c:3825:gst_pad_create_stream_id_internal:<fakesrc0:src> Creating
random stream-id, consider implementing a deterministic way of creating a
stream-id
0:00:00.455584401 16407 0x7f006c0025e0 FIXME        rtpjitterbuffer
gstrtpjitterbuffer.c:1395:gst_jitter_buffer_sink_parse_caps:<rtpjitterbuffer0>
Unsupported timestamp reference clock
0:00:00.455616947 16407 0x7f006c0025e0 FIXME        rtpjitterbuffer
gstrtpjitterbuffer.c:1403:gst_jitter_buffer_sink_parse_caps:<rtpjitterbuffer0>
Unsupported media clock
0:00:00.457236636 16407 0x7f006c0025e0 WARN                 basesrc
gstbasesrc.c:2947:gst_base_src_loop:<udpsrc0> error: Internal data flow
error.
0:00:00.457268553 16407 0x7f006c0025e0 WARN                 basesrc
gstbasesrc.c:2947:gst_base_src_loop:<udpsrc0> error: streaming task paused,
reason not-linked (-1)
Error: Internal data flow error.
Debug: gstbasesrc.c(2947): gst_base_src_loop ():
/GstPipeline:my_pipeline/GstRTSPSrc:source/GstUDPSrc:udpsrc0:
streaming task paused, reason not-linked (-1)
0:00:00.458046376 16407      0x10af5e0 WARN                 rtspsrc
gstrtspsrc.c:5520:gst_rtspsrc_try_send:<source> receive interrupted
0:00:00.458083322 16407      0x10af5e0 WARN                 rtspsrc
gstrtspsrc.c:7546:gst_rtspsrc_pause:<source> PAUSE interrupted





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