the documentation says:
INTER-CHANNEL DECORRELATION
In the case of stereo input, once the data is blocked it is optionally passed through an inter-channel decorrelation stage. The left and right channels are converted to center and side channels through the following transformation: mid = (left + right) / 2, side = left - right. This is a lossless process, unlike joint stereo. For normal CD audio this can result in significant extra compression. flac has two options for this: -m always compresses both the left-right and mid-side versions of the block and takes the smallest frame, and -M, which adaptively switches between left-right and mid-side.
is this only relevant for stereo files or also for multi-channel (more than 2 channels)?
i wonder how well a 16 channel 3rd order ambisonics file could be compressed.
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