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What does FLAC actually store?, How does the compression work?
MistryMan
post Feb 15 2006, 18:00
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I've just recently gotten into all these different kinds of lossless codecs and I'm fascinated by how they work.

I understand that codecs like FLAC and TTA make a prediction for the next sample and then simply store the difference between the prediction and the actual value - which is most of the time significantly smaller than storing the full amplitude.

My question is.. does it only store that difference value? Or is it having to store the prediction model/function/curve or whatever was used for that particular chunk of data. If it's only storing the difference, and that difference is usually a very small number, then shouldnt compression ratios be much better than 2:1 or 3:1?

Maybe I havent fully understood how this stuff works, anyone able to shed a bit of light on it for me? Thanks.
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