Does FLAC do any 5.1 channel decorrelation? 2016-03-09 09:12:12 I'm unclear on whether it's possible to make FLAC do any interchannel decorrelation for 5.1 audio. The FAQ seems to suggest that it does:"FLAC supports from 1 to 8 channels per stream. Channels are only grouped in FLAC to take advantage of interchannel correlation and to define common channel assignments (like stereo L/R, 5.1 surround, et cetera)."Although in other places it seems to hint that this only works for stereo audio.I've been testing on a directory of 5.1 audio files (a film soundtrack, split into reels, with 6 mono wav files per reel, 5 reels). On one hand, I've compressed all the mono wav files to FLAC individually, and on the other hand, I've used ffmpeg to merge each set of 6 mono wavs into a 6-channel 5.1 wav file, and then used FLAC to compress that. I simply use flac --best *.wav to compress each set of files.However, there's practically no difference in total file size at all, except for a miniscule difference which I suspect is due to not having redundant headers. On the other hand, I know for a fact that 5.1 film soundtracks have a huge amount of interchannel correlation, so this result seems counterintuitive to me.What am I doing wrong? Does FLAC simply not do this? Or are there options to do it? If it doesn't do it, would encoding the front and back channels as two stereo pairs and using the stereo correlation options be an alternative?