[asterisk-app-dev] Clicks in audio

[Naftoli Gugenheim]

Plot twist: If I play the same files via the dialplan, no popping sound.
So, if I call the locally running asterisk on the extension that goes to
the app, I hear a pop at the beginning of the even first prompt. It's using
STREAM FILE via asterisk-java. However if I add another extension:

exten => 555,1,Answer
exten => 555,n,While(true)
exten => 555,n,Background(/sounds/XXX)
exten => 555,n,EndWhile
exten => 555,n,Hangup

using Background or Playback, it plays the first and subsequent times with
no pop.



On Tue, Oct 17, 2017 at 8:48 PM Naftoli Gugenheim <naftoligug at gmail.com>
wrote:

> On Tue, Oct 17, 2017 at 1:08 PM Barry Flanagan <barryf-lists at flanagan.ie>
> wrote:
>
>> On 17 October 2017 at 17:19, Naftoli Gugenheim <naftoligug at gmail.com>
>> wrote:
>>
>>> Hi, thanks for replying.
>>>
>>> 1. I have opened the files in audacity. When I play it on my computer I
>>> can't hear anything like the popping sound. Visually I'm not really sure
>>> what to look for. I mean I can't see a some that looks like it would
>>> account for such a loud pop.
>>>
>>
>> I have had this in the past. Look at the very end of the recording in
>> audacity - if you see where the main voice ends - starts to flatline - and
>> if there is any small non-flatline after it, delete it. I have found that
>> when someone is making recordings the keyboard click to stop the recording
>> can get picked up. I usually manually delete from the end of the recording
>> I want, and replace it with silence in Audacity just to be sure. Often you
>> will not here it during playback in Audacity, but it is very apparent over
>> a phone line.
>>
>
> Is there any measurement that can be said? I'm dealing with a very large
> number of files. I would prefer if it's something I could check in code.
>
> Also, according to this, what if a file doesn't end with silence at all
> (recording stops pretty simultaneous to the end of speaking... or just
> background noise) -- would it be the same problem? Is the rule that you
> need to allow audio files to begin with a ramp up from silence and end with
> a ramp down to silence? And if so are there any numbers that can be put on
> it, like ramping duration, or duration of actual silence at the beginning
> and end? And measured in wall time or samples (if that isn't a dumb
> question)? Note: I'm not looking for a scientific number that less is bad
> and more is unnecessary. But it would be nice to have numbers that are
> known to be safe, without being too perfectionist...
>
>
>
>
>>
>> Hope this helps
>>
>> -Barry Flanagan
>>
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>
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