[Freeswitch-users] Recording G729

[Yuri Ritvin]

You'll better record in a standard WAV format and will convert it into MP3
with lame (you need to install lame, of course, onto your server) thus
off-loading some burden from the freeswitch processing. Say you record WAV
files into a folder /opt/freeswitch/sounds/recorded and wanna have MP3
files in a folder /opt/freeswitch/sounds/recorded/mp3, then you create the
following script and run it via crontab every 15 minutes (or any desired
time interval):

#!/bin/bash
cd /opt/freeswitch/sounds/recorded
for i in `find . -name "*.wav" -cnewer mp3|cut -d/ -f2|cut -d. -f1`
do
lame -S -h --resample 16 -b 24 $i.wav mp3/$i.mp3
done



On Mon, Nov 25, 2013 at 9:39 PM, Kees Varekamp <kees at mroffice.org> wrote:

> Hi all,
>
> I'm suffering from poor sound quality on my setup, using GSM on the a-leg
> and PCMU on the b-leg. I'm thinking it's mostly bandwidth/network related,
> so I'm considering switching to G729 on both legs, as that is the only
> compressed codec that the b-leg supports (it's a sip gateway).
>
> But a complicating factor is that the calls need to be recorded in mp3.
>
> So I have some questions that I hope someone here can answer:
>
>
>    - Does transcoding (for example GSM<>PCMU) negatively affect the sound
>    quality, even when the CPU seems to be ok with it?
>    - If yes, does recording 2 legs using the same codec (say G729) to a
>    different sound format (say mp3) have the same (negative) effect?
>    - When you use G729 on both legs (using mod_com_g729), it is even
>    possible to record to mp3?
>
>
> Thank you,
>
> Kees
>
>
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