libavcodec/xan.c:204: error: Uninitialized Value
  The value read from opcode was never initialized.

libavcodec/xan.c:204:5: 
202.     }
203. 
204.     size = opcode & 3;
         ^
205.     bytecopy(dest, src, size);  dest += size;  src += size;
206. }
