what exactly does your client mean?
can catalyst play a dvd?
does he mean can the mac play a dvd?
or does he want control of a dvd from some external device?
and sdi?
what is sdi requred for?
what are you displaying your dvd on?
or does he want to display the dvd image through catalyst?
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is this a commercial dvd - or one that the client created?
you can use MacTheRipper to convert the dvd to a quicktime movie?
which you can then play in catalyst?