Re: Duration of recorded file is longer than recording time using SoX

On 2019-12-16 16:44, George S. Williams wrote:
> On 12/16/2019 11:14 AM, Jeremy Nicoll - ml sox users wrote:
>> On 2019-12-16 02:39, George S. Williams wrote:
>>> I'm using SoX on Centos 7 to record the audio output from GQRX, a SDR
>>> application. I've selected Monitor of Built-in Audio Analog Stereo
>>> from the Recording Tab of the Pulseaudio Volume Control. I'm trying 
>>> to
>>> save a .wav file with a sample rate of 6k. I'm using the command
>>> 
>>> |sox -t pulseaudio 2 --rate 6k --channels 1 test.wav |

>> Does the presence of the 'pipe' character before "sox" mean that audio
>> was being generated by a previous command?
>> 
>> If so, although you may think you terminated the recording after a
>> certain time, maybe that program still sent data to sox?  Or maybe
>> sent data before you though you started the recording?
>> 
>> In your "too long" wave file, does it start with 1h 6m of something
>> else, or end with 1h 6m of something else?  Or what?

> The command is run by itself- the pipe characters are a consequence of
> copying and pasting that I didn't catch.
> 
> The wave file contains what was recorded, nothing extra. It is
> 'stretched' to the longer duration.

George's reply to me was, it seems, off-list.  Don't know why.  I'm
replying on-list.

What does  soxi  say about the wave file?

Does the file have the file-size you'd expect for the single channel,
unknown (to us anyway) bit depth, 6000 samples per second?

Is what's in the file a recording of something (music, speech?) that
sounds 'sensible' to a human, or is it some sort of scientific data
that one can't tell about (by ear)?

Does the header info in the wav file contain the right descriptive
info for the data?


-- 
Jeremy Nicoll - my opinions are my own


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