libavfilter/avfilter.c:386: error: Uninitialized Value
  The value read from src[_] was never initialized.

libavfilter/avfilter.c:386:18: 
384.                 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
385. 
386.             if (!src[i]) continue;
                      ^
387. 
388.             for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
