libavfilter/avfilter.c:430: error: Uninitialized Value
  The value read from src[_] was never initialized.

libavfilter/avfilter.c:430:18: 
428.                 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
429. 
430.             if (!src[i]) continue;
                      ^
431. 
432.             for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
