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[mattkhan]

I've searched but can't find a clear answer to this. Does anyone know exactly how the channels are downmixed?

[Matt]

This one is pretty easy.

The rear surrounds and surrounds are mixed onto the surround channel.  Both are done at 1.0.

[mattkhan]

This one is pretty easy.

The rear surrounds and surrounds are mixed onto the surround channel.  Both are done at 1.0.

thanks. What do you mean by "at 1.0" exactly?

[Matt]

thanks. What do you mean by "at 1.0" exactly?

They're added together at the full level.  Then the entire signal will be attenuated (all channels) to avoid clipping.

[mattkhan]

They're added together at the full level.  Then the entire signal will be attenuated (all channels) to avoid clipping.

Is the amount of attenuation driven by audio analysis or is a fixed amount?

[Matt]

Is the amount of attenuation driven by audio analysis or is a fixed amount?

It just totals that one channel will have 2.0 in it as a max (since it's two channels) so everything will be turned down by 0.5.

The actual analysis looks at the totals coming into all the channels and is pretty fancy.  But I think this mix is so simple that what I said above is right.

[mattkhan]

Ok thanks for confirming that.