问题描述:

I have a working GStreamer-1.0 pipeline in terminal and I'm trying to replicate it in code using GStreamer 1.0 on Mac/Xcode.

My sending pipeline:

gst-launch-1.0 videotestsrc ! videoconvert ! x264enc ! rtph264pay config-interval=1 ! udpsink host=127.0.0.1 port=5000

My receiving pipeline:

gst-launch-1.0 -vvv udpsrc port=5000 caps="application/x-rtp" ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink

This can also by played back in VLC with the following SDP file:

v=0

m=video 5000 RTP/AVP 96

c=IN IP4 127.0.0.1

a=rtpmap:96 H264/90000

I've created the following code to replicate the aforementioned but the problem is that the receiving pipeline doesn't display anything while running this code. The code does send packets to the network according to the Xcode debug console.

gint

main (gint argc,

gchar *argv[])

{

GstElement *pipeline, *videosrc, *conv,*enc, *pay, *udp;

// init GStreamer

gst_init (&argc, &argv);

loop = g_main_loop_new (NULL, FALSE);

// setup pipeline

pipeline = gst_pipeline_new ("pipeline");

videosrc = gst_element_factory_make ("videotestsrc", "source");

conv = gst_element_factory_make ("videoconvert", "conv");

enc = gst_element_factory_make("x264enc", "enc");

pay = gst_element_factory_make("rtph264pay", "pay");

g_object_set(G_OBJECT(pay), "config-interval", 1, NULL);

udp = gst_element_factory_make("udpsink", "udp");

g_object_set(G_OBJECT(udp), "host", "127.0.0.1", NULL);

g_object_set(G_OBJECT(udp), "port", "5000", NULL);

gst_bin_add_many (GST_BIN (pipeline), videosrc, conv, enc, pay, udp, NULL);

if (gst_element_link_many (videosrc, conv, enc, pay, udp, NULL) != TRUE)

{

return -1;

}

// play

gst_element_set_state (pipeline, GST_STATE_PLAYING);

g_main_loop_run (loop);

// clean up

gst_element_set_state (pipeline, GST_STATE_NULL);

gst_object_unref (GST_OBJECT (pipeline));

g_main_loop_unref (loop);

return 0;

}

网友答案:

The problem was that the port parameter is supposed to be an int, so I had to change

g_object_set(G_OBJECT(udp), "port", "5000", NULL);

to

g_object_set(G_OBJECT(udp), "port", 5000, NULL);

Sometimes it's easy to miss one's own simple mistakes.

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