libavformat/rtsp.c:2428: error: Uninitialized Value
  The value read from payload_type was never initialized.

libavformat/rtsp.c:2428:9: 
2426.     }
2427. 
2428.     if (ff_rtp_get_codec_info(par, payload_type)) {
              ^
2429.         av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
2430.                                 "without an SDP file describing it\n",
