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How to losslessly eliminate left track from MP3
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Mac Enthusiast
Join Date: Jan 2001
Location: Leesburg, Virginia
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I have a number of MP3 tracks on my iPod. I could cut their storage space in two by eliminating one of the two stereo tracks, because they are identical, anyway. Is there a way to do this losslessly and in a batch sort of way?
Dominik Hoffmann
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Professional Poster
Join Date: Oct 2002
Location: Off the Tobakoff
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If the tracks really are mono to begin with, rerip the tracks; otherwise, if you care more about space than fidelity, it probably won't denegrate the sound you can hear from your iPod headphones if you compress the files again.
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"You rise," he said, "like Aurora." 
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Addicted to MacNN
Join Date: Nov 2002
Location: Seattle, WA
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Online
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I was under the impression that Joint Stereo was designed to take this into account, like, it doesn't duplicate data if it's the same in each track, only if it detects a difference. And joint stereo has been around since long before iTunes, and there's no reason not to use it (by which I mean your mp3s are probably encoded with it). If I'm mistaken, someone please correct me.
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Mac Enthusiast
Join Date: Jan 2001
Location: Leesburg, Virginia
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I've been ripping to joint stereo. However, when I ripped to my tracks to mono, they were half the size of the equivalent joint stereo ones.
There has got to be an algorithm that allows me to take out one of these tracks without messing with the encoding of the other one.
Dominik Hoffmann
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Addicted to MacNN
Join Date: Jun 1999
Location: Las Vegas, NV, USA
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Just set your iTunes importing preference to mono, and then convert your tracks.
Chris
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Mac Enthusiast
Join Date: Jan 2001
Location: Leesburg, Virginia
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Originally posted by chabig:
Just set your iTunes importing preference to mono, and then convert your tracks.
Chris
Is this a lossless process? I doubt it. -- Dominik
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Addicted to MacNN
Join Date: Jun 1999
Location: Las Vegas, NV, USA
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It can't be any more lossy than taking a two track audio file and throwing away an entire track. Just do it. You are obviously more concerned about file storage space than audio quality anyway. iTunes is pretty good. I really don't think you'll notice any degradation in sound quality.
Chris
(Last edited by chabig; Oct 8, 2004 at 07:40 PM.
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Mac Elite
Join Date: Jan 2000
Location: Seattle, WA, King
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Actually iTunes mp3 encoder is really, really bad. I would re-encode to AAC, or better yet, re-rip from your CDs.
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Clinically Insane
Join Date: Nov 1999
Location: Where Airbus babies hatch
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Originally posted by chabig:
It can't be any more lossy than taking a two track audio file and throwing away an entire track.
Um. If the track in question is *mono* (such as an audiobook), then throwing away an entire track is not lossy at all.
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