libavcodec/rv40.c:506: error: Uninitialized Value
  The value read from cbp[_] was never initialized.

libavcodec/rv40.c:506:9: 
504.          * 3/4 pel in any component (any edge orientation for some reason).
505.          */
506.         y_h_deblock =   y_to_deblock
             ^
507.                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)
508.                     | ((cbp[POS_TOP]        & MASK_Y_LAST_ROW) >> 12);
