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Negative gains may result in slightly lower bitrates, 711 MiB gained over a total of 27 GiB
skamp
post Nov 28 2012, 21:36
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I started experimenting a bit after Greynol said that he applies album gain prior to MP3 encoding. I did the same while transcoding my entire library to Vorbis (AoTuV) -q 5: the resulting files take 711 MiB less than their counterpart (gain unchanged), over a total of 27.2 GiB. That's a 2.56% gain; average bitrate went down from 161 kbps to 157 kbps.

Obviously, I got those results because most of my music gets negative Replaygain values. As far as I'm concerned, it's interesting because I'm pretty short on space on my Clip's 32 GB microsdhc card.


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greynol
post Nov 28 2012, 21:56
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No problem. Another benefit of scaling downwards prior to encoding is that clipping during lossy decoding can be mitigated, for those who are worried about it.


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BFG
post Nov 28 2012, 22:05
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I suppose that this makes sense, in that some of the quieter sections of the track will be attenuated down to (near) silence, so the lossy encoder only needs to approximate a narrower section of the audio spectrum.

EDIT: The topics that greynol links to seems to explain this quite well. Looks like I have some reading to do smile.gif

This post has been edited by BFG: Nov 28 2012, 22:07
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