Re: [LAU] Input to aplay to make a file instead? - Linux-audio-user

19 Apr 2020

On Sun, 19 Apr 2020 12:29:37 +0200 al3xu5 / dotcommon wrote:

...
  Sat, 18 Apr 2020 09:50:30 +0100 - John Murphy
&lt;rosegardener(a)freeode.co.uk&gt;uk>:

  I use a program which plays regions of various
.wav files. Its
 output pipes into aplay like: '| aplay -f FLOAT_LE -c 2 -r 48000'

 To where can I pipe its output, instead, to make a new .wav file,
 or make a compressed file? Preferably faster than the region(s)
 take to play.

 Or, if not, make aplay write to a file instead of playing?

 Thank you.    

 Use sox:

 sox source.wav -L -c 2 -r 48000 new.wav trim <start_second>
<duration_seconds>

 where:

 -L : little endian
 -c 2 : 2-channels stereo
 -r 48000 : freq (Hz)
 <start_second> : region start (second)
 <duration_seconds> : region duration (seconds)
  That works a treat. Thank you. sox works so much better when it has
an actual file as input that it works just as well without -L -c -r

As the region lines I get give the start and end positions, I can use
'=' before duration and give it the end position directly like:

REGION "Fri0304.wav" 00:00:01.14181 00:00:05.07359 works in sox like:

sox Fri0304.wav new.wav trim 1.14181 =5.07359

$ soxi new.wav

Input File     : 'new.wav'
Channels       : 2
Sample Rate    : 48000
Precision      : 16-bit
Duration       : 00:00:03.93 = 188725 samples ~ 294.883 CDDA sectors
File Size      : 755k
Bit Rate       : 1.54M
Sample Encoding: 16-bit Signed Integer PCM

I should be able to write a script to get the filename and start/end
seconds from the region lines and tell sox what to do.

Many thanks and best regards to all who have responded. I'll be fine
now and I may even try some of the other ways, because they're there. :)

-- 
John.