libavformat/rtsp.c:2160: error: Uninitialized Value
  The value read from payload_type was never initialized.

libavformat/rtsp.c:2160:9: 
2158. 
2159.     memset(&codec, 0, sizeof(codec));
2160.     if (ff_rtp_get_codec_info(&codec, payload_type)) {
              ^
2161.         av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
2162.                                 "without an SDP file describing it\n",
