libavfilter/avfilter.c:319: error: Uninitialized Value
  The value read from src[_] was never initialized.

libavfilter/avfilter.c:319:17: 
317.                 ff_get_plane_bytewidth(link->format, link->cur_buf->w, i);
318. 
319.             if(!src[i]) continue;
                     ^
320. 
321.             for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
