libavcodec/mjpegdec.c:679: error: Uninitialized Value
  The value read from left[_] was never initialized.

libavcodec/mjpegdec.c:679:17: 
677.                 top[i]     = buffer[mb_x][i];
678. 
679.                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
                     ^
680. 
681.                 left[i] = buffer[mb_x][i] =
