Date: Sat, 24 Nov 2001 14:35:20 +0100 From: Stefan Esser <se@freebsd.org> To: Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de> Cc: freebsd-multimedia@FreeBSD.ORG, Stefan Esser <se@freebsd.org> Subject: Re: off topic - need help from an expert Message-ID: <20011124143520.A20031@StefanEsser.FreeBSD.org> In-Reply-To: <200111231639.fANGdFt56057@gilberto.physik.rwth-aachen.de> References: <200111231639.fANGdFt56057@gilberto.physik.rwth-aachen.de>
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On 2001-11-23 17:39 +0100, Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de> wrote:
>
> I have a music tune which I want to play at half speed but same pitch.
> (It contains some be-bop portions which are played so fast that it is hard
> to write them down while hearing).
> I've heard this could be done by downsampling or repeat or some
> such transformation. Don't know exactly.
>
> Could that be done with sox or lame? I have the file as .wav or .mp3.
> Could also convert to .aiff.
From the sox man page:
stretch factor [window fade shift fading]
Time stretch file by a given factor. Change
duration without affecting the pitch. factor of
stretching: >1.0 lengthen, <1.0 shorten dura-
tion. window size is in ms. Default is 20ms.
The fade option, can be "lin". shift ratio, in
[0.0 1.0]. Default depends on stretch factor.
1.0 to shorten, 0.8 to lengthen. The fading
ratio, in [0.0 0.5]. The amount of a fade's
default depends on factor and shift.
Didn't try it myself, though ...
Gruß, STefan
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