WFD source:

 Only video:
 gst-launch-1.0 videotestsrc ! x264enc ! mpegtsmux ! rtpmp2tpay ! udpsink host=127.0.0.1 port=5000

 Only audio:
 gst-launch-1.0 audiotestsrc ! avenc_ac3 ! mpegtsmux ! rtpmp2tpay ! udpsink host=127.0.0.1 port=5000

 Both:
 gst-launch-1.0 videotestsrc ! x264enc ! muxer.  audiotestsrc ! avenc_ac3 ! muxer.  mpegtsmux name=muxer ! rtpmp2tpay ! udpsink host=127.0.0.1 port=5000

WFD sink:

 Only audio:
 gst-launch-1.0 udpsrc port=5000 caps="application/x-rtp" ! rtpmp2tdepay ! decodebin ! autoaudiosink

 Only video:
 gst-launch-1.0 udpsrc port=5000 caps="application/x-rtp" ! rtpmp2tdepay ! decodebin ! autovideosink

 Both:
 gst-launch-1.0 udpsrc port=5000 caps="application/x-rtp" ! rtpmp2tdepay ! decodebin name=decoder ! autoaudiosink  decoder. ! autovideosink