Cutting MP3 without re-coding?

Discuss about generic usage of MediaCoder.

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onyx
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Cutting MP3 without re-coding?

Post by onyx » Mon Mar 23, 2009 2:51 am

I tried various settings ("Copy Audio" checkbox, "Split" mode, etc), but MediaCoder always does a full decoding+encoding which both consumes a lot of CPU time and probably affects the quality.
I just want to transcribe/extract a piece from the existing MP3 encoding without alteration of the format/compression method/level. Is this possible?

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Placio74
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Re: Cutting MP3 without re-coding?

Post by Placio74 » Mon Mar 23, 2009 3:03 am

Why not use specialized tools mp3DirectCut or Mp3 Knife...?
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Re: Cutting MP3 without re-coding?

Post by Placio74 » Mon Mar 23, 2009 10:54 am

mixer wrote:audacity
Yes.
But typical audio editor works on uncompressed audio.
Well... Audacity can open (decode) MP3 and edit, but when save to MP3 must encode again.
While mp3DirectCut can edit (only cutting and few other of course) without re-encoding.
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Re: Cutting MP3 without re-coding?

Post by Placio74 » Mon Mar 23, 2009 4:41 pm

mixer wrote:Not if you just cut and paste segment. Right??
Rather not.
When export to MP3, required is and used Lame.
Or i something overlooked...?
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Re: Cutting MP3 without re-coding?

Post by onyx » Tue Mar 24, 2009 2:05 am

used this mp3DirectCut. Very cute and fast.
(Wonder how they packed all that functionality and i18n into just 200k ;-)

Yet, would be very interesting to know if this Audacity has such smart capabilities to re-use encoded segments.
E.g. when a fad-in and fad-out would be edited, if the major segment in the middle would be transcribed without re-encoding... ?

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