Re: [SoX-users] First time use of SoX : converting wav to mono 8000Hz

[Jan S. <ha...@st...>]

On Aug 17 12:49:41, Jonas Kellens wrote:
> On 08/17/2010 11:53 AM, Jan Stary wrote:
> > What does soxi(1) say about the file?
> >    
> 
> The original files :
> 
> [root@asterisk testing]# soxi testExtended.wav
> 
> Input File     : 'testExtended.wav'
> Channels       : 2
> Sample Rate    : 44100
> Precision      : 16-bit
> Duration       : 00:00:56.57 = 2494953 samples = 4243.12 CDDA sectors
> Sample Encoding: 16-bit Signed Integer PCM
> 
> [root@asterisk testing]# soxi testLong.wav
> 
> Input File     : 'testLong.wav'
> Channels       : 2
> Sample Rate    : 44100
> Precision      : 16-bit
> Duration       : 00:01:27.05 = 3839052 samples = 6529 CDDA sectors
> Sample Encoding: 16-bit Signed Integer PCM

This looks better. I don't know why your installation of file(1)
said it was a zillion-channel file of goooglilion Hz samplerate.

> > Why are you using deprecated effects??
> >
> > sox -V testExtended.wav testExtended2.wav remix - rate 8000
> > sox -V testExtended.wav -c 1 -r 8000 testExtended2.wav
> >    
> 
> [root@asterisk testing]# sox -V testLong.wav -c 1 -r 8000 testLong3.wav
> sox: SoX v14.2.0
> sox formats: detected file format type `wav'
> 
> Input File     : 'testLong.wav'
> Channels       : 2
> Sample Rate    : 44100
> Precision      : 16-bit
> Duration       : 00:01:27.05 = 3839052 samples = 6529 CDDA sectors
> Sample Encoding: 16-bit Signed Integer PCM
> Endian Type    : little
> Reverse Nibbles: no
> Reverse Bits   : no
> 
> 
> Output File    : 'testLong3.wav'
> Channels       : 1
> Sample Rate    : 8000
> Precision      : 16-bit
> Duration       : 00:01:27.05 = 696427 samples ~ 6529 CDDA sectors
> Sample Encoding: 16-bit Signed Integer PCM
> Endian Type    : little
> Reverse Nibbles: no
> Reverse Bits   : no
> Comment        : 'Processed by SoX'
> 
> sox sox: effects chain: input      44100Hz 2 channels 16 bits (multi)
> sox sox: effects chain: rate       44100Hz 2 channels 16 bits
> sox sox: effects chain: mixer      8000Hz 2 channels 16 bits (multi)
> sox sox: effects chain: output     8000Hz 1 channels 16 bits (multi)
> sox effects: rate clipped 13 samples; decrease volume?
> 
> 
> > Looks good; what does soxi(1) say about the file?
> > Can you play the resulting mono/8000 file?
> >    
> 
> [root@asterisk testing]# soxi testLong3.wav
> 
> Input File     : 'testLong3.wav'
> Channels       : 1
> Sample Rate    : 8000
> Precision      : 16-bit
> Duration       : 00:01:27.05 = 696427 samples ~ 6529 CDDA sectors
> Sample Encoding: 16-bit Signed Integer PCM
> 
> 
> I can play this file in Gnome Mplayer.

So sox did exactly what you told it to do: it converted
the original 2c/44k/16b file to a 1c/8k/16 file. What seems
to be the problem here?

> Does this mean the resulting Mono 8000Hz file is correct ?!

How would I know? You have played it in mplayer, so you know.
Technically, it's a 1c/8k/16b file, just as you wanted.

> If so, the 
> problem indeed lies with the Asterisk software. A question there has 
> been asked but left unanswered.
> 
> If you are 100% sure the resulting file testLong3.wav should be a 
> correct wav-file, then this topic is closed.