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Hi,

I’m trying to output a replay .avi and .wav for my game. When generating the .wav, I get 6 channels if I’m using 5.1 audio. But I want to write a simple stereo file.

The FMod system is open and has all samples loaded, so I cannot switch the speaker mode anymore. I’m left with downsampling the 6 channels to 2.
How could I do this? Are the first 3 channels on the left side? Should I just add those? Or perhaps average the 3 (probably not)?

Thanks,
Ruud

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From the docs:
[quote:29fitq28]FMOD_SPEAKERMODE_5POINT1

5.1 speaker setup. This includes front left, front right, center, rear left, rear right and a subwoofer. [/quote:29fitq28]

There is instructions on how to down mix here:
http://www.hydrogenaudio.org/forums/lof … 44593.html

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Ok thanks. Seems a strange order where the ‘center’ channel is placed just before the rear channels (I’d have expected: Fl, Fr, Rl, Rr, Center, LFE).

Thanks for link, interesting read.

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Downmixing to Stereo and Downmixing to Pro Logic are different things.

When properly mixing down 5.1 to pro-logic the rear channels should be band pass filtered and then added to the stereo downmix with a +/- 90 degree phase shift such that the rear signal is 180 degrees out of phase between the L and R channels of stereo, but only 90 degrees out of phase with the centre image.

Wikipedia (of all places) has a good example of the different between stereo downmix and pro-logic downmix:

http://en.wikipedia.org/wiki/Downmixing

As far as I’m aware the LFE (Low Frequency Extension) should always be discarded with downmixing. In a THX system, it’s played back with 10dB more gain than the other channels, so to include it in the downmix you would need to give it 10dB gain and that would certainly give you some distortion.

Remember, 6 speakers can be louder than 2 speakers! :)

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