pub unsafe extern "C" fn gst_element_class_add_static_metadata(
klass: *mut GstElementClass,
key: *const c_char,
value: *const c_char,
)
pub unsafe extern "C" fn gst_element_class_add_static_metadata(
klass: *mut GstElementClass,
key: *const c_char,
value: *const c_char,
)