libavformat/mpeg.c:305: error: Uninitialized Value
  The value read from c was never initialized.

libavformat/mpeg.c:305:16: 
303.     if ((c & 0xe0) == 0x20) {
304.         dts  =
305.         pts  = get_pts(s->pb, c);
                    ^
306.         len -= 4;
307.         if (c & 0x10) {
