[linux-audio-user] balance stereo

[Pete Harlow]

Presumably you could

- Use sox with the pick effect to split the file into two files, one per 
original channel

- Use sox with the stat effect to get a correction to normalise each of 
the stereo files to 100%

- Use sox with -v or vol effect to normalise the two files

- Glue them back into a stereo file with soxmix.

A problem with automating this process is that the correction will be 
based on the highest peak in the file, and that the perceived loudness 
of each channel may or may not be related to this. To get a subjective 
balance, you may need to do the above to get the absolute correction to 
avoid clipping, then *reduce* one channel or the other according to the 
average power in the channel - you can probably derive a fiddle factor 
from the difference in rms values given by stat.

I've not tried any of this other than using -v, so it is just a guess...

Pete.

DJ Astroboy wrote:
> Is there a cookbook, command line way to balance out a stereo wav file 
> where the two channels should be roughly at the same level? Rezound 
> works well for this if you've got lots of time, but I've ended up with a 
> bunch of these, and I need to automate...
> 
> Andy/DJ Astroboy
> http://www.djastro.com

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