libavcodec/fmvc.c:358: error: Uninitialized Value
  The value read from opcode was never initialized.

libavcodec/fmvc.c:358:13: 
356.             bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
357.             bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
358.             len = (opcode >> 5) - 1;
                 ^
359.             do {
360.                 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
