libavformat/rtsp.c:1399: error: Uninitialized Value
  The value read from err was never initialized.

libavformat/rtsp.c:1399:9: 
1397.     else if (CONFIG_RTSP_MUXER)
1398.         err = ff_rtsp_setup_output_streams(s, host);
1399.     if (err)
              ^
1400.         goto fail;
1401. 
