libavcodec/utils.c:318: error: Uninitialized Value
  The value read from stride_align[_] was never initialized.

libavcodec/utils.c:318:17: 
316.                 buf->data[i] = buf->base[i];
317.             else
318.                 buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
                     ^
319.         }
320.         if(size[1] && !size[2])
