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Invert Phase Without Transcoding?, Is it possible?
Funkstar De Luxe
post Dec 1 2007, 17:24
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I have some MP3 that are 180* out of phase. Is it possible to invert one channel without transcoding the entire file?

Tony


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SebastianG
post Dec 2 2007, 09:54
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QUOTE (Funkstar De Luxe @ Dec 1 2007, 17:24) *
Is it possible to invert one channel without transcoding the entire file?


AFAIK there's no software available for the job.

But to answer your question: Yes, in case no intensity stereo has been used or you just want both channels to be inverted. No, in case you want only one channel inverted and intensity stereo has been used.

Cheers!
SG

This post has been edited by SebastianG: Dec 2 2007, 09:55
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pdq
post Dec 2 2007, 17:03
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QUOTE (SebastianG @ Dec 2 2007, 04:54) *
QUOTE (Funkstar De Luxe @ Dec 1 2007, 17:24) *

Is it possible to invert one channel without transcoding the entire file?


AFAIK there's no software available for the job.

But to answer your question: Yes, in case no intensity stereo has been used or you just want both channels to be inverted. No, in case you want only one channel inverted and intensity stereo has been used.

Cheers!
SG

So far I have been unable to figure out how one channel could be inverted losslessly in the case of a M/S frame. I seem to only get both channels inverted or both channels swapped or both channels inverted and swapped.
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SebastianG
post Dec 2 2007, 19:41
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QUOTE (pdq @ Dec 2 2007, 17:03) *
So far I have been unable to figure out how one channel could be inverted losslessly in the case of a M/S frame.


Inverting one channel only involves swapping M and S

Inverting R = swapping M and S
Inverting L = swapping M and S and inverting both, M & S
Inverting L and R = inverting M & S
Swapping L and R = inverting S

Cheers!
SG

This post has been edited by SebastianG: Dec 2 2007, 19:46
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pdq
post Dec 2 2007, 22:35
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QUOTE (SebastianG @ Dec 2 2007, 14:41) *
QUOTE (pdq @ Dec 2 2007, 17:03) *

So far I have been unable to figure out how one channel could be inverted losslessly in the case of a M/S frame.


Inverting one channel only involves swapping M and S

Inverting R = swapping M and S
Inverting L = swapping M and S and inverting both, M & S
Inverting L and R = inverting M & S
Swapping L and R = inverting S

Cheers!
SG

Excellent biggrin.gif
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magicgoose
post Oct 25 2013, 19:25
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Has anyone implemented in code this solution? I want to fix one song which almost surely won't be ever available as lossless.
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