How to send Video-Audio together in network using RTP packetization

[gstreader]

My command line code(using gst-launch or shell script) is working fine for Audio and Video over the network.

But ,How to use g_signal_connect() in client side to connect rtpbin with videodepayloader or audiodepayloader.

command line code:

gst-launch -v gstrtpbin name=rtpbin latency=$LATENCY                  \

   udpsrc caps=$VIDEO_CAPS port=5000 ! rtpbin.recv_rtp_sink_0         \

   rtpbin. ! $VIDEO_DEC ! $VIDEO_SINK                               \

   udpsrc port=5001 ! rtpbin.recv_rtcp_sink_0                         \

   rtpbin.send_rtcp_src_0 ! udpsink port=5005 host=$DEST sync=false async=false

but,In C language when I am writing I am using g_signal_connect()  to connect rtpbin with depayloader both case for audio and video.

But,am getting error 

new payload on pad: recv_rtp_src_0_511525528_96

**

ERROR:client_H264_AAC.c:92:on_pad_added: assertion failed: (lres == GST_PAD_LINK_OK)

Aborted

Please reply.

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[gstreader]

I have used this code:
g_signal_connect (rtpbin, "pad-added", G_CALLBACK (pad_added_cb), videodepay);

  g_signal_connect (rtpbin, "pad-added", G_CALLBACK (pad_added_cb), audiodepay);

and am getting the error.But,only audio or video it is working.