I'm surprised to see such a new standard for FLAC - the protocol itself has been in use for decades, but this IETF standard has just been published. I would love to hear about the context of this publication.
I was curious if instead of a dedicated lossless codec you could just encode with Opus plus the (compressed) bit difference from the original data. Google sent me to this informative HN thread: <a href="https://news.ycombinator.com/item?id=14598929">https://news.ycombinator.com/item?id=14598929</a><p>TL;DR: probably not.