forgot to say a few things:
- only the order and the type of the element (sce, cpe or lfe) really matters for the encoding; the encoder does not use the front, side or back info; I have used that fact for instance for 7.1 and 7.1(wide) or 7.1(wide-side): same PCE config can be used and works perfectly fine . - while spec allows up to 16 elements for front, side, back, lfe groups , I found that the decoder can not deal with more than four per group;


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