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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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