Re: Adjusting write buffer for recording

[Shane Blaser <shane.blaser@callfire.com>]

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Rec writes to a file I watch the file.

I listen to the sound coming in and watch the file size.  There is a period
of silence then when volume rises the file is written to.  But this
introduces a delay I can not afford

I have adjusted the buffer down to 128 ( below that I get constant
overrun)  I see no change in the file writing....
On Aug 11, 2013 10:10 AM, "Jan Stary" <hans@stare.cz> wrote:

> On Aug 09 14:05:32, shane.blaser@callfire.com wrote:
> > Hello I have an application that processes audio as rec writes the file.
>
> Does this mean that rec(1) writes into a pipe
> and your application is reading that pipe?
>
> > rec is buffering the data before it writes and I get
> > the updates about 2 or 3 seconds late.
>
> How do you know that? How exactly are you reading
> what rec(1) is writing?
>
> > I have played with the --buffer pram and I not been able to see a
> > difference.
> >
> > I would like to tell rec to write the data as soon as it gets it or
> reduce
> > the file write buffer size.
>
> That's what --buffer is supposed to do ...
>
> > I have silence detection on
> > rec -c 1 -r 8000 --buffer 4096 currentRecording.wav silence 1 0.0001
> 2.1% 1
> > 15.0 2.6%
> >
> > The writes look like this
> >
> >   Size of currentRecording.wav = 24576  Size of currentRecording.wav =
> 36864
> > *Size* *of* *currentRecording.wav* *=* *45056*  *Size* *of* *
> > currentRecording.wav* *=* *77824*
>
> The steps are indeed multiples of 4096.
> Can you try with other --buffer to see
> if the data becomes available to your application
> in the chunks that rec(1) is writing?
>
>
>
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