Audacity

I have some ogg and mp3 files on which I would like perform the 
following two operations:

a) duplicate right channel to the left one (currently left 
channel is silent - mono recording - and I would prefer to have 
them both playing the same)

b) increase volume

Of course I can open the file in audacity, perform the 
operations, then export it to ogg/mp3 but I am slightly afraid 
whether such second encoding can reduce quality. Is it the case?
Will the sequence
   - decode OGG in audacity
   - export it to OGG 
reduce the quality comparing to the original or not?

And, maybe there is a way to perform such operations (volume 
change, channel duplication) without re-encoding?

Re: [Audacity-users] Do simple operations (volume change, duplicating channel, ...) on OGG and MP3 files require reencoding From: Lincoln <lincoln.lordello@te...> - 2005-01-13 17:17 Only volume normalisation can be done without re-encoding. This is not an Audacity problem, any sound editor will do the same. Try to use "normalize" program, that support both mp3 and ogg. Em Qui, 2005-01-13 às 16:50 +0100, Marcin Kasperski escreveu: > I have some ogg and mp3 files on which I would like perform the > following two operations: > > a) duplicate right channel to the left one (currently left > channel is silent - mono recording - and I would prefer to have > them both playing the same) > > b) increase volume > > Of course I can open the file in audacity, perform the > operations, then export it to ogg/mp3 but I am slightly afraid > whether such second encoding can reduce quality. Is it the case? > Will the sequence > - decode OGG in audacity > - export it to OGG > reduce the quality comparing to the original or not? > > And, maybe there is a way to perform such operations (volume > change, channel duplication) without re-encoding? -- Gentoo 2004.2 AthlonXP GNU/Linux-2.6.10-nitro4 GNU/Linux User #239576 Lincoln Lordello /"\ \ / Campanha da Fita ASCII - Contra Mail HTML X ASCII Ribbon Campaign - Against HTML Mail / \ lincoln.lordello@...

Re: [Audacity-users] Do simple operations (volume change, duplicating channel, ...) on OGG and MP3 files require reencoding From: Graham Mitchell <graham@gr...> - 2005-01-14 04:45 > Only volume normalisation can be done without re-encoding. > This is not an Audacity problem, any sound editor will do the same. Try > to use "normalize" program, that support both mp3 and ogg. Actually, this isn't even true, either. The latest version of normalize is 0.7.6, and although it can adjust the volume of mp3s without re-encoding, it still must decode oggs to wav, and the re-encode after normalization. Normalize (by Chris Vaill) can be found here: http://www1.cs.columbia.edu/~cvaill/normalize/ The next version of normalize is supposed to be able to normalize vorbis files losslessly, but it's been a long time since the author has done any work on the project at all. And as far as channel duplication, sox can do it, but not with compressed audio. Anyway, if you find a workable solution, we'd all like to hear about it. -- Graham Mitchell - computer science teacher, Leander High School

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