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Re: Beatles "Love" Audio Menu Mystery

Posted by Neil Wilkes (P) on February 22, 2007 at 02:30:53

In Reply to: Re: Beatles "Love" Audio Menu Mystery posted by The Sound Guy on February 21, 2007 at 17:03:52:

In DVD-Video, you can have up to 8 Audio streams per VTS.
BUT - and this is the big one, the specifications for VTS in DVD-Audio are different.
A VTS for DVD-A can only have 2 Audio streams.
This is primarily because of a section of the specs that has been ignored by a lot of labels stating "All VTS Shall be pointed from the AMG (Audio ManaGer) of the ATS".
As this requires a "set system - Branch" command in authoring (When we link to a DD 5.1 or a DTS 5.1 stream in DVD-A we are actually jumping into the Video_TS from the Audio_TS) and as there can only be 2 Audio streams present in a single title in the Audio_TS, there are only 2 options for Set System. Audio=0 and Audio=1 (where Audio=0 is telling the player to access Stream #1 in the pointed VTS).
As most authors do not actually point or link to the VTS, this often gets overlooked. The correct way to do this where 3 (or more) streams are required in the VTS is to "Double-Author" and use 2 VTS, with 2 streams on each.
THe reasoning behind this is to give the end user more choice.
With linking done properly, if the content of a disc has
Advanced Resolution 5.1 (24/96 or 24/48)
Advanced Resolution 2.0
LPCM 2.0 (16/48 usually, sometimes 24/48)
DD 2.0
DD 5.1
DTS 5.1
Then it should be possible to access all 6 of these streams from the AMG. If you cannot do this, the disc is not correctly authored.

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