libavfilter/avfilter.c:357: error: Uninitialized Value
  The value read from src[_] was never initialized.

libavfilter/avfilter.c:357:18: 
355.                 av_get_image_linesize(link->format, link->cur_buf->video->w, i);
356. 
357.             if (!src[i]) continue;
                      ^
358. 
359.             for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
