[asterisk-app-dev] Clicks in audio

Tue Oct 17 10:44:46 CDT 2017

Depending on the format you should be able to open the audio files in
another program (like Audacity [1]) and verify if there are anomalies in
the audio itself.

Other than that you could also try using an audio file that is known to not
have issues. Try using one of the installed sound files found in Asterisk
to see if those have similar symptoms.

Sometimes clicks and pops could be due to dropped packets. Try getting a
pcap and see if any packets are being dropped between Asterisk and the
phone.

[1] http://www.audacityteam.org/

On Mon, Oct 9, 2017 at 11:17 AM, Naftoli Gugenheim <naftoligug at gmail.com>
wrote:

> Hi, I have an IVR that uses FastAGI, currently running on asterisk 13 (via
> the cleardevice/docker-cert-asterisk13-ubuntu docker image).
>
> The problem: In between playing audio files there is an audible click. I'm
> not sure if somehow the audio files themselves contain clicks and for some
> reason I don't notice when playing them without asterisk but over the phone
> they're magnified, if it's a codec issue, if I'm doing something the wrong
> way, or what. Any help is greatly appreciated!
>

> Here is an illustration of what I mean, generated using a call recording
> app on my phone: https://drive.google.com/open?id=
> 0B2SmgnDyV1aETDZrdnJBTU82RGc
>
> Here are the files from the server that it uses: https://drive.google.
> com/open?id=0B2SmgnDyV1aEWGNJYy13OGZMTUU
>
> I'm not sure why I have both .wav and .sln files.
>
> Here is some information from the asterisk CLI:
>
>
> ubuntu at chavrusa-main:~$ docker-compose exec asterisk asterisk -r
> Asterisk certified/13.1-cert4, Copyright (C) 1999 - 2014, Digium, Inc. and
> others.
> Created by Mark Spencer <markster at digium.com>
> Asterisk comes with ABSOLUTELY NO WARRANTY; type 'core show warranty' for
> details.
> This is free software, with components licensed under the GNU General
> Public
> License version 2 and other licenses; you are welcome to redistribute it
> under
> certain conditions. Type 'core show license' for details.
> =========================================================================
> Connected to Asterisk certified/13.1-cert4 currently running on
> 9c5c45693e10 (pid = 17)
> 9c5c45693e10*CLI> core show version
> Asterisk certified/13.1-cert4 built by root @ 2dcc79fb8a1e on a x86_64
> running Linux on 2016-03-03 08:25:13 UTC
> 9c5c45693e10*CLI> core show file formats
> Format     Name       Extensions
> ------     ----       ----------
> siren7     siren7     siren7
> g719       g719       g719
> h264       h264       h264
> siren14    siren14    siren14
> h263       h263       h263
> gsm        gsm        gsm
> gsm        wav49      WAV|wav49
> ilbc       iLBC       ilbc
> slin192    sln192     sln192
> slin96     sln96      sln96
> slin48     sln48      sln48
> slin44     sln44      sln44
> slin32     sln32      sln32
> slin24     sln24      sln24
> slin16     sln16      sln16
> slin12     sln12      sln12
> slin       sln        sln|raw
> slin16     wav16      wav16
> slin       wav        wav
> g723       g723sf     g723|g723sf
> g729       g729       g729
> g726       g726-16    g726-16
> g726       g726-24    g726-24
> g726       g726-32    g726-32
> g726       g726-40    g726-40
> g722       g722       g722
> ulaw       au         au
> alaw       alaw       alaw|al|alw
> ulaw       pcm        pcm|ulaw|ul|mu|ulw
> 29 file formats registered.
> 9c5c45693e10*CLI> core show codecs audio
> Disclaimer: this command is for informational purposes only.
> It does not indicate anything about your configuration.
>       ID  TYPE     NAME DESCRIPTION
> ------------------------------------------------------------
> -----------------------
>        5 audio     g726 (G.726 RFC3551)
>        3 audio     alaw (G.711 a-law)
>        1 audio     g723 (G.723.1)
>       19 audio    speex (SpeeX)
>       20 audio    speex (SpeeX 16khz)
>       21 audio    speex (SpeeX 32khz)
>       23 audio     g722 (G722)
>        7 audio    adpcm (Dialogic ADPCM)
>       24 audio   siren7 (ITU G.722.1 (Siren7, licensed from Polycom))
>       27 audio     g719 (ITU G.719)
>       18 audio     g729 (G.729A)
>        8 audio     slin (16 bit Signed Linear PCM)
>        9 audio     slin (16 bit Signed Linear PCM (12kHz))
>       10 audio     slin (16 bit Signed Linear PCM (16kHz))
>       11 audio     slin (16 bit Signed Linear PCM (24kHz))
>       12 audio     slin (16 bit Signed Linear PCM (32kHz))
>       13 audio     slin (16 bit Signed Linear PCM (44kHz))
>       14 audio     slin (16 bit Signed Linear PCM (48kHz))
>       15 audio     slin (16 bit Signed Linear PCM (96kHz))
>       16 audio     slin (16 bit Signed Linear PCM (192kHz))
>        2 audio     ulaw (G.711 u-law)
>       17 audio    lpc10 (LPC10)
>       26 audio  testlaw (G.711 test-law)
>       39 audio     none (<Null> codec)
>       25 audio  siren14 (ITU G.722.1 Annex C, (Siren14, licensed from
> Polycom))
>        6 audio g726aal2 (G.726 AAL2)
>        4 audio      gsm (GSM)
>       22 audio     ilbc (iLBC)
>       28 audio     opus (Opus Codec)
>
>
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>
>

-- 

Kevin Harwell
Digium, Inc. | Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: http://digium.com & http://asterisk.org
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