Function ff_formats_unref

pub unsafe extern "C" fn ff_formats_unref(
    ref_: *mut *mut AVFilterFormats,
)

If *ref is non-NULL, remove *ref as a reference to the format list it currently points to, deallocates that list if this was the last reference, and sets *ref to NULL.

    Before                                 After

________ ________ NULL |formats |<––––. |formats | ^ | ____ | |____________ | ____ | |____________ | |refs| | | | | |refs| | | | | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink | |* *———>|ref| | | | | | |*ref| | || | | || | || | | || || |_______________ || |_____________