[asterisk-users] Transcoding

[Darren Sessions]

I have used virtually all versions of Asterisk 1.0+ (literally, either  
in production or testing) with OpenSUSE 10+ and 11 on AMD and Intel  
and haven't had any issues with gcc optimizations with regards to  
audio sounding choppy. This scenario for me has always been the gsm  
libs.


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dmsessions at gmail.com
http://www.darrensessions.com
http://www.linkedin.com/in/dsessions
_____________________________



On Aug 6, 2008, at 9:16 AM, Mark Michelson wrote:

> Guilherme Loch Waltrick Góes wrote:
>> I have a server with Asterisk 1.4.21.1 <http://1.4.21.1> and some
>> prompts recorded in GSM format. I have these same prompts in another
>> server with Asterisk 1.4.18, on this server the prompts sound pretty
>> nice, but on the first one they sound pretty choppy. Was there any
>> changes on the transcoding code between this 2 versions ? Any hints ?
>>
>> Best Regards,
>>
>> -- 
>> Guilherme Loch Góes
>>
>> Visite nossa loja virtual: http://www.shopvoip.com.br
>>
>> Notícias e Fórum sobre VoIP com software livre:
>> http://www.asteriskexperts.com.br
>
> One important difference between the servers may be the compiler  
> used. We have
> heard reports that using GCC 4.2 or later with optimizations on  
> causes choppy
> audio when using GSM.
>
> Solutions to this include either downgrading your compiler to GCC  
> 4.1 or
> earlier, or selecting DONT_OPTIMIZE in menuselect under compiler  
> options and
> then recompiling Asterisk. I also believe that you can set the  
> optimization
> level for compilation to -O2 in Makefile.rules and have no choppy  
> audio, but I
> cannot confirm this.
>
> Of course, if this server isn't running GCC 4.2, then you can ignore  
> everything
> I've said so far :)
>
> Mark Michelson
>
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