Some sort of averaging or differencing perhaps?
However, when I invert one of the two channels and sum them to mono, the result is not silence - there is a difference between the channels. Presumably the mp3 encoder treated each channel slightly differently.
If they're different encodings you can average them. If they use the same encoder though I would expect both channels to differ only by some rounding error though.
Strange.... I wouldn't expect that. I can't listen to that file 'cause I'm at work, but is there a chance that those are analog differences?
And that's worth a try too.... Maybe the left or right channel sounds better and making a mono file from the best channel will improve the sound?
How do I tell if the difference is 'meaningful', though?
The FLAC file I posted leads me to believe that the differences are in some way significant.
Is averaging the two channels my only option here?