making wav sample of a big mp3

making wav sample of a big mp3

[Michael Stutz]

I need to make a 15-second WAV sample from a 3-minute mp3 file that I have.
Does anyone know an easy way to do this?

(I thought the simplest way to do this would be to play the mp3 in one xterm
and use brec in another, but this doesn't work -- it would if I'd install
paudio, the package that adds a /proc/audio device. It's a sweet idea --
could this become a standard part of the kernel package?)

Re: making wav sample of a big mp3

[Michael Stutz]

On Thu, 17 Sep 1998, Michael Stutz wrote:

> I need to make a 15-second WAV sample from a 3-minute mp3 file that I have.
> Does anyone know an easy way to do this?

This is how I do it (improvements welcome!):

dd if=<input.mp3> of=tmp.mp3 count=X  [where X = 14.2 * number-of-seconds-desired]

mpg123 -s tmp.mp3 > tmp.raw 

sox -r44100 -s -w -c2 tmp.raw sample.wav

Re: making wav sample of a big mp3

[Thomas C Sobczynski]

Out of curiosity, I tried this, and just got noise with "play sample.wav"


> This is how I do it (improvements welcome!):
> 
> dd if=<input.mp3> of=tmp.mp3 count=X  [where X = 14.2 * number-of-seconds-des
> ired]
> 
> mpg123 -s tmp.mp3 > tmp.raw 
> 
> sox -r44100 -s -w -c2 tmp.raw sample.wav

Re: making wav sample of a big mp3

[Michael Stutz]

On Fri, 18 Sep 1998, Thomas C Sobczynski wrote:

> Out of curiosity, I tried this, and just got noise with "play sample.wav"

Was is a mono mp3? If so, use "-c1" instead of "-c2" on the last line..

> 
> > This is how I do it (improvements welcome!):
> > 
> > dd if=<input.mp3> of=tmp.mp3 count=X  [where X = 14.2 * number-of-seconds-des
> > ired]
> > 
> > mpg123 -s tmp.mp3 > tmp.raw 
> > 
> > sox -r44100 -s -w -c2 tmp.raw sample.wav
> 

Re: making wav sample of a big mp3

[Thomas C Sobczynski]

> Was is a mono mp3? If so, use "-c1" instead of "-c2" on the last line..

MPEG 1.0 layer III, 128 kbit/s, 44100 Hz joint-stereo

Re: making wav sample of a big mp3

[Chris Reed]

On Thu, 17 Sep 1998 18:48:31 -0400 (EDT) , Michael Stutz wrote: 

>I need to make a 15-second WAV sample from a 3-minute mp3 file that I have.
>Does anyone know an easy way to do this?
>

[this does not belong in linux-sound...]

mpg123 --help shows:
...
   -k n  skip first n frames [0]        -n n  decode only n frames [all]

Use these options with -s to grab the output; the no. of frames /s will 
depend on the mp3,  but a bit of trial and error should work OK.



 -- Christopher Reed, Selwyn College, Cambridge --
 E-Mail: cr212@cam.ac.uk  WWW: http://dura.sel.cam.ac.uk/ [~cr212/]
 r2 T1 cSEL dCS hEn/Chi A4 S+ C*$+++L/UdP W+++ y# a VTsj (Cantab) 1.0 
"Offer me solutions, offer me alternatives and I decline"

Re: making wav sample of a big mp3

[Michael Stutz]

On Sat, 19 Sep 1998, Chris Reed wrote:

> On Thu, 17 Sep 1998 18:48:31 -0400 (EDT) , Michael Stutz wrote: 
> 
> >I need to make a 15-second WAV sample from a 3-minute mp3 file that I have.
> >Does anyone know an easy way to do this?
> 
> [this does not belong in linux-sound...]

Why?