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What you call a fold down is called a downmix in ac3 standards.
The default settings for an ac3 decoder making a downmix of a 5.1 stream to a stereo output is the following (as mentioned here : http://www.dolby.com/us/en/technologies/dolby-metadata.html) :
Left and Right channels are sent to their respective L and R channels.
Center channel is sent to both ...
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Yes and no. The order is: L - R - C - LFE - LR - RR alright, but the LT and RT is for format mastering purposes only (not to be confused with the pre-mastering normally just called mastering in music), and not used in the actual 5.1-track at all. It is, however, used for the stereo-track and other similar applications.
The AC3/DTS/etc. coding comes after ...
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It's been a while since this was posted and as it has had no replies I thought I would tell you I know. Hopefully others will fill in additional details.
AC-3 file has 48KHz sample rate, 16-bit resolution and the data is encoded using a lossy compression format. As far as I am aware 24-bit data is not supported and the data cannot be left unencoded (PCM), ...
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