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Reduce existing MP3 bit rate in iTunes
Authored by: Anonymous on Feb 20, '03 11:26:27AM

Resampling MP3s will lose more quality than sampling the original material at the target bit rate.

If upsampling: you will not restore any of the lost quality. MP3 is lossy compression.

If downsampling: because of the way MP3 works, you will lose more quality this way.

MP3 is similar to JPEG in that they are both lossy compression that work by leveraging traits of human perception.

Try this: Compress a good quality photograph to a particular JPEG quality level. Now, compress the same photograph to a higher JPEG quality level. Then recompress the same photo down to the same quality level as the first image. You'll see more compression artifacts in the second image than the first. Same thing happens when downsampling MP3s.

If you are at all concerned about signal quality, resample the CDs. If not-- if what you are hearing makes you happy-- don't worry about it!

(Personally, I had been sampling everything at 256kbit fixed rate. I'm going to resample everything variable bit rate w/a minimum of 160 and an emphasis on quality. By simply rotating stuff onto my iPod regularly, the ability to "only" have 450 - 500 songs on my 5gb iPod is not a problem.)

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