Apple DVD Studio Pro 4 - Manual (Page 508)

The following table shows the combinations for the aspect ratio bits.
Total Bit 11 Bit 10 Aspect ratio
0 0 0 4:3
1024 0 1024 Not specified
2048 2048 0 Reserved
3072 2048 1024 16:9
SPRM 15: Player Audio Configuration
Each DVD player can have several types of audio capabilities. Most players can handle
Dolby Digital (AC-3), Linear PCM, and MPEG Audio. There are other audio options such
as DTS and SDDS, as well as karaoke capabilities.
By reading the values of SPRM 15, you can see which audio options the player has. This
could be useful if you have two types of audio streams and want to play the proper one
for that player. For example, if the player is capable of Dolby Digital (AC-3) audio, you
might want to play that stream instead of a stereo PCM stream.
Here is a table of the values for SPRM 15:
Bit value Bit Player audio configuration
1 0 Reserved
2 1 Reserved
4 2 SDDS karaoke capability (option)
8 3 DTS karaoke capability (option)
16 4 MPEG karaoke capability first bit
32 5 MPEG karaoke capability second
bit
64 6 AC-3 karaoke capability
128 7 PCM karaoke capability
256 8 Reserved
512 9 Reserved
1024 10 SDDS capability (option)
2048 11 DTS capability (option)
4096 12 MPEG capability first bit
8192 13 MPEG capability second bit
16384 14 AC-3 capability
32768 15 Reserved
508 Chapter 20 Creating Scripts