#if CONFIG_MIX_FILTER
AVFILTER_DEFINE_CLASS(mix);
-AVFilter ff_vf_mix = {
+const AVFilter ff_vf_mix = {
.name = "mix",
.description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
.priv_size = sizeof(MixContext),
AVFILTER_DEFINE_CLASS(tmix);
-AVFilter ff_vf_tmix = {
+const AVFilter ff_vf_tmix = {
.name = "tmix",
.description = NULL_IF_CONFIG_SMALL("Mix successive video frames."),
.priv_size = sizeof(MixContext),