add some info about convert modes

nu774 / qaac

CLI QuickTime AAC/ALAC encoder

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add some info about convert modes #56

Closed tico-tico closed 5 years ago

tico-tico commented 5 years ago

I've finally found explanation for the bitrate modes, so let's make help more helpful.

https://developer.apple.com/library/archive/technotes/tn2237/_index.html#//apple_ref/doc/uid/DTS40008147-CH1-SUBSECTION11

nu774 commented 5 years ago

Well, those "/ bitrate" just explains that bitrate is a required argument for --abr,--cvbr, and --cbr. I don't think more explanation is necessary on this part.

And CVBR target bitrate is by no ways minimal limit. Try compressing pure sine wave with --cvbr 256. The result can be go far lower than 256kbps when input is that simple.

tico-tico commented 5 years ago

OK, it's up to you of course.