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For 2 mp3 streams, is it possible to mix two streams of same bitrate with different mixdown values without uncompressing and recompressing it?
For example, if we have two songs that are already encoded in mp3 192 kbit, and we want to create crossfade of length 5 seconds, we should mix last several frames from one song with same number of frames from the second song, with mix rates increasing from 0 to 100 for entering song and from 100 to 0 for closing one.
From what I know, the mp3-compression goes VERY ROUGHLY something like this:
So if you only have the mp3-data, you should have chunks/frames of frequencies (with index). To mix the streams you’d have to take the corresponding frames from each stream and construct a new frame that e.g. consist of f(idx) = fA(idx) + fB(idx) /2. Be aware that the frames have different lengths, because not all indices (idx) are present, which is because some frequencies are drop for the compression. I hope that helps for the beginning. I’m aware that this is not a full on solution.