#define hstack_options stack_options
AVFILTER_DEFINE_CLASS(hstack);
-AVFilter ff_vf_hstack = {
+const AVFilter ff_vf_hstack = {
.name = "hstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
.priv_size = sizeof(StackContext),
#define vstack_options stack_options
AVFILTER_DEFINE_CLASS(vstack);
-AVFilter ff_vf_vstack = {
+const AVFilter ff_vf_vstack = {
.name = "vstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
.priv_size = sizeof(StackContext),
AVFILTER_DEFINE_CLASS(xstack);
-AVFilter ff_vf_xstack = {
+const AVFilter ff_vf_xstack = {
.name = "xstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs into custom layout."),
.priv_size = sizeof(StackContext),