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MP3 Bit Reservoir, Did I understand it right ?
post Aug 30 2012, 02:53
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Ok, so I've read some posts and learned a bit about the principles, but, something is still not clear...

- In V0, there is room for frames to go higher than 320kbps while sparing these bits on the low bitrate frames? (It can go a bit higher than 320 kbps limit)

- In 320 CBR, that doesn't happen, because the frame is literally stuck and can't got higher than 320 kbps, and thus it wastes on the frames that were with low bitrate. (It cannot go higher the 320kbps limit)

Is it still true that VBR would not be so consistent/precise as 320 in terms of choosing the right bitrate for a particular frame: eg: a frame needs 256 k but it "guesses" and calculates 250 k and then it was not truly consistent?

Thanks for answers.

This post has been edited by krafty: Aug 30 2012, 02:55
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post Aug 30 2012, 03:30
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Bit reservoir has nothing to do with frame sizes, which are always fixed to specific sizes. Bit reservoir means that a given frame may depend on data from previous frames.

Perhaps you would have an easier time understanding how this works if you look at the source code to a decoder instead of reading standards documents? I suggest looking at libmad if that is the case.
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