How to use ffplay to play a rtp stream without sdp?

Is there any command line options that I can use to tell ffplay the video stream format of the RTP stream?

With a simple SDP file like bellow, I can play the stream very well.

c=IN IP4 0.0.0.0
m=video 9170 RTP/AVP 96
a=rtpmap:96 H264/90000