libavcodec/fmvc.c:252: error: Uninitialized Value
  The value read from opcode was never initialized.

libavcodec/fmvc.c:252:9: 
250.         }
251.         i = bytestream2_get_le16(gb);
252.         pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
             ^
253.         pos = pos - (i >> 2);
254.         if (pos == bytestream2_tell_p(pb))
