Using udpsink to stream h264 with gstreamer ( c++ ) - udp

Question

I'm trying to stream h264 video over the network using gstreamer ( in windows ) over UDP.
First if I use a pipeline like this, everything appears to be ok, and I see the test pattern:
videotestsrc, ffmpegcolorspace, x264enc, rtph264pay, rtph264depay, ffdec_h264, ffmpegcolorspace, autovideosink
Now I decided to divide this pipeline in client and server parts, transmitting the stream over udp using udpsink and udpsrc.
Server: videotestsrc, ffmpegcolorspace, x264enc, rtph264pay, udpsink
Client: udpsrc, rtph264depay, ffdec_h264, ffmpegcolorspace, autovideosink
On server I use something like that:
source = gst_element_factory_make ("videotestsrc", "source");
ffmpegcolortoYUV = gst_element_factory_make ("ffmpegcolorspace", "ffmpegcolortoYUV");
encoder = gst_element_factory_make ("x264enc", "encoder");
rtppay = gst_element_factory_make ("rtph264pay", "rtppay");
udpsink = gst_element_factory_make ("udpsink", "sink");
g_object_set (source, "pattern", 0, NULL);
g_object_set( udpsink, "host", "127.0.0.1", NULL );
g_object_set( udpsink, "port", 5555, NULL );
Then I add the elements to the pipeline and run, there are no errors anywhere.
Now if I look for UDP port 5555, it's not listening!!!!
The client part also runs but if there is no UDP port listening on server side it won't work.
EDIT: In fact I was very close to the solution... If I start the client it works, but with some problems on the visualization... I think the problem is the x264enc configuration. Anybody knows how to change x264enc parameters like speed-preset or tune???
I tried to instantiate GstX264EncPreset or GstX264EncTune but I have no the declarations of these strcutures.
Anybody knows any way to setup x264enc in other way, like parsing a string or something like that?

Answer 1

I know this is an older post, but you can set the GstX264EncPreset value using a simple integer that corresponds to the preset value.
g_object_set(encoder, "speed-preset", 2, NULL); works for me. The values can be found using gst-inspect-1.0 x264enc and are as follows:
speed-preset : Preset name for speed/quality tradeoff options (can affect decode compatibility - impose restrictions separately for your target decoder)
flags: readable, writable
Enum "GstX264EncPreset" Default: 6, "medium"
(0): None - No preset
(1): ultrafast - ultrafast
(2): superfast - superfast
(3): veryfast - veryfast
(4): faster - faster
(5): fast - fast
(6): medium - medium
(7): slow - slow
(8): slower - slower
(9): veryslow - veryslow
(10): placebo - placebo

Answer 2

Try setting the caps on the udpsrc element to "application/x-rtp".