[shekh]

Just checked, this is not necessary.

There is virtual destructor:

class VDXVideoFilter {
public:
	VDXVideoFilter();
	virtual ~VDXVideoFilter();

And it is called exactly from DeinitProc wrapper:

void __cdecl VDXVideoFilter::FilterDeinit   (VDXFilterActivation *fa, const VDXFilterFunctions *ff) {
	(*reinterpret_cast<VDXVideoFilter **>(fa->filter_data))->~VDXVideoFilter();
}

virtual DeInit does not add any value here