Encore CS4 is transcoding compliant Blu-Ray audio assets when set to 'Do not transcode'

Hi there,
I have a Blu-Ray concert video project consisting of 3-menus, 4-sequentially linked timelines (intro-1, intro-2, main concert timeline, and credits).
All audio assets consist of 96k/24-bit WAV files from the same professionally rendered mastered audio source.
Here's the issue:
When importing my 96k/24-bit audio assets in Encore CS4, they all show as Blu-Ray compliant and maintain the 'Do not transcode' property in the assets menu.
However, after rendering the project to Blu-Ray I immediately noticed that the main concert timeline (2-hrs 10-min) had been transcoded down to 48k/16-bit while the other smaller intro/credits timelines had rendered correctly and were playing back at the desired 96k.24-bit rate.
In order to eliminate possible issues with the main timeline's audio file source, I created a smaller main timeline (35-min) using the exact same audio source files and lo & behold - the main timeline was not down-transcoded and is playing back at the desired 96k/24-bit rate.
I'm wondering if there is a non-documented limitation in rendering audio files over a certain size as my main timeline is made up of 2-total WAV files of 2.2Gb each.
I have the ability to import a single AIFF file at 4.4GB for the main timeline - but for some reason CS4 does not recognize AIFF files as Blu-Ray compliant and will show the transcode setting as 'Automatic'.
Imported AIFF files always showed as 'Do not transcode' in the Blu-Ray assets menu in Encore CS3 (even though there is a documented bug which prevents rendering AIFF audio to Blu-Ray and I would have to convert to WAV files and re-import anyway in CS3).
My next step is to try splitting the main timeline into shorter chunks, but this is not the direction I want to go in.
Any help would be greatly appreciated!
-Cheers

Ok, solved my own problem - solution below for those with similar issues.
1. My audio timelines exported from Final Cut Pro as AIFF are actually 'AIFC' which is technically not Blu-Ray compliant, thus Encore will need to transcode. Unfortunately - Encore has no quality preset settings for dealing with PCM audio transcodes higher than 48k/16-bit (why not?). Encore CS4 will happily pass 96k/24-bit through to a Blu-Ray build without transcoding if the supplied file is true AIFF (not-AIFC) and/or similarly compliant WAV files.
2. My main Encore timeline consisted of 2-WAV files at 2.2Gb each placed in a single Encore timeline due to the total audio being over 4GB thus requiring me to split the source audio files in half in order to stay under the 4GB limit for WAV files, and also because I had to export the FCP audio timeline using Compressor in order to generate Blu-Ray compliant audio files (non-AIFC). Also - (possible bug?) if Encore has 2-separate audio files in the same timeline it will transcode the audio to the current project's default audio settings (48k/16-bit in my case) - even though the assets are showing as 'Do not transcode' in the asset menu for Blu-Ray. It clearly states in the Encore CS4 manual that imported WAV files at 96k/24-bit will not be transcoded - but it appears in this case when 2-audio files are placed in the same timeline that it will transcode with no warning - bothersome to say the least.
I suppose the alternative is to work with a lossless audio format which supports files larger than 4GB - which would only require a single audio file for a single Encore timeline, but other than DTS Master Audio (not available on this project) I'm not sure what audio format would work in Encore to support 96k/24-bit audio files larger than 4GB.
If anyone knows - drop some knowledge!
-Cheers

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