Can not create RTP capabilities

[CC]

Version: GStreamer 1.10.2
Platform: macOS 10.13 Beta 

I use the command , and it works well. And I implement it by C , but the RTP
capabilities is not available。

gst-launch-1.0 -v udpsrc port=12347 !
application/x-rtp,payload=107,encoding-name=H264 ! rtph264depay ! queue !
mux. udpsrc port=12345 !
application/x-rtp,payload=111,encoding-name=OPUS,clock-rate=48000,
channels=2 ! rtpopusdepay ! opusparse ! opusdec ! queue ! voaacenc
bitrate=128000 ! aacparse ! audio/mpeg,mpegversion=4,stream-format=raw !
queue ! flvmux streamable=true name=mux ! queue ! rtmpsink
location=rtmp://localhost:1935/myapp/testav


The code I create rtph264depay RTP capabilities is below.

...
    GstCaps *caps;

    caps = gst_caps_new_simple ("application/x-rtp",
                                "encoding-name", G_TYPE_STRING, "H264",
                                "payload", G_TYPE_INT, 107, NULL);

    if (!GST_IS_CAPS(caps)) {
        g_printerr ("caps null ??.\n");
        return -1;
    }
...












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