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Each of the high-def (actually a misnomer) audio formats have in their core the base codec, i.e.Dolby Digital 5.1 @ 640k and DTS 5.1 @ 1509k. That is to allow for players, amps, etc. that do not know about the non-lossy formats to be able to play them. That also allows for programs to also extract the core. No idea why BDRB is extracting the core instead of keeping the whole stream.
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