libavcodec/rv40.c:453: error: Uninitialized Value
  The value read from clip[_] was never initialized.

libavcodec/rv40.c:453:40: 
451.                     r->rdsp.rv40_h_loop_filter(Y, s->linesize, dither,
452.                                        clip_cur,
453.                                        mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,
                                            ^
454.                                        alpha, beta, betaY, 0, 1);
455.                 }
