StackItem          56 libavfilter/vf_stack.c     StackItem *items;
StackItem         147 libavfilter/vf_stack.c         StackItem *item = &s->items[i];
StackItem         208 libavfilter/vf_stack.c             StackItem *item = &s->items[i];
StackItem         232 libavfilter/vf_stack.c             StackItem *item = &s->items[i];
StackItem         267 libavfilter/vf_stack.c             StackItem *item = &s->items[i];