Where can I find the “Sonic Cinemaster Audio Decoder 4.3” DirectShow filter?
That’s a difficult question! The decoder was available through Sonic Cineplayer HD DVD Decoder pack, which seems to be a discontinued product now. It would appear that the only way to access this decoder is though Sonic Scenarist which is rather expensive. Another possible solution could be Sonic Cinevision, but can’t be sure the decoder is included. Price is a minus there too.
