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

[Jonas K. <jon...@te...>]

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

> 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.

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




Thank you for your help.


Kind regards,

Jonas.