libavformat/rtpdec_vp8.c:253: error: Uninitialized Value
  The value read from old_timestamp was never initialized.

libavformat/rtpdec_vp8.c:253:9: 
251. 
252.     if (returned_old_frame) {
253.         *timestamp = old_timestamp;
             ^
254.         return end_packet ? 1 : 0;
255.     }
