Blu-Ray w/ uncompressed PCM 5.1 audio in Encore?
 

As the title suggests - I'm desperate to get a Blu-Ray authored for a film festival and NEED to get fantastic sound - preferably uncompressed PCM 5.1.

Has anyone tried this? Is my only option to use AC-3 at 640 Kbps?

Thanks in advance, Doug.

(I'm posting similarly in Vegas thread for the DVD-A users - apologies if this seems like cross-posting!)