The following function for C shows how to use the ltmmProcessors object from the ltmmPlayControl object to register a 3rd-party video processor.
void EnableMyVideoProcessor() { IltmmProcessors *pVideoProcessors = NULL; IltmmPlay_get_VideoProcessors(pPlayCtrl, &pVideoProcessors); if(NULL != pVideoProcessors) { // Register the external filter by class id IltmmProcessors_RegisterExternalProcessor(pVideoProcessors, L"{AFF289A6-ABF1-4d68-9A51-634BF7077CFC}", VARIANT_TRUE); IUnknown_Release(pVideoProcessors); } }