Topic: 7.1 Lrs/Rrs Mapped To Incorrect Channels
In doing a number of tests, comparing the generated packages made from openDCP with Wailua (the reference standard) and with the ISDCF audio channel layout document, it is apparent that openDCP assigns the extra two channels for 7.1 to the incorrect channels.
The additional two channels for 7.1 DS are extra REAR channels, not extra front channels, as are currently mapped via openDCP. The layout is fairly strange, as there are some legacy wiring issues that needed to be considered.
The packages currently made by openDCP actually map to the older-style Sony SDDS 7.1 system, where there are additional front/center channels. These are no longer really supported, and have never been used in Digital Cinema (to my knowledge).
Creating a industry-standard 7.1 DCP would result in the following channel layout:
5. Left Surround Side
6. Right Surround Side
7. Hearing Impaired (Or Silence)
8. Visual Descriptive (Or Silence)
9. Silence (Formerly Center Left)
10. Silence (Formerly Center Right)
11. Left Surround Rear
12. Right Surround Rear
This presents a bit of awkwardness when creating these packages, as equal-duration silence needs to be generated to pad channels 7-10.
Other than that, the software is fantastic, and I use it regularly for many non-commercial applications. I'd be a happy donor if we could just address this one minor issue.