[Red5] Standalone SIP application ...
mondain at gmail.com
Fri Nov 14 10:09:59 PST 2008
If I'm not mistaken the audio from the SIP server is not transcoded by
default from PCM and is simply sent to the FlashPlayer as-is. The only two
currently available options that I noticed here are PCM or ADPCM, both of
which are supported by FlashPlayer since version 6 (I think). I would be
interested to hear anything else you find out, in terms of the audio
On Fri, Nov 14, 2008 at 7:31 AM, Mauro Sérgio Ferreira Brasil <
mauro.brasil at tqi.com.br> wrote:
> Hello there!
> I was analysing the SIP application code (red5phone) to verify the reasons
> I'm getting a bad audio quality on one way during a call.
> I'm testing this application making calls to a WTL Windows SIP client we
> develop here that uses OpenWengo libraries for VoIP.
> The condition I have here is: the audio that user talking through rd5phone
> is very good, but audio received by the Windows desktop client is not.
> I used Wireshark to analise the packets on both ways, but the only think
> I've done, trying to get things better, was to change the "audio_frame_size"
> property present on "sip.cfg" file from 256 to 160 to match the frame size
> used by the desktop SIP client.
> It didn't help.
> I tried to change the "clock rate" given by "audio_sample_rate" property
> from 8000 to 16000 too and audio got considerably better, but I think this
> configuration should not be changed that way and get it back to find another
> As I don't have any indication or clue that points to another way, I'm
> focusing now on the asao2ulaw decoder, considering that the problem is on
> audio encoded being sent to the desktop client.
> The point is that as long as I could see, this codec application is used
> only for converting ASAO (or Nellymoser) audio to ulaw (G711 or PCMU). So,
> how the inverse path is done ?
> Which part of Red5 or red5phone is responsible to get the ulaw audio from
> RTP packages and convert it to ASAO back to red5phone user ?
> Can anyone please help or give me any leads on this ?
> Thanks and best regards!
> * *Technology and Quality on Information* Mauro Sérgio Ferreira
> Brasil Coordenador de Projetos e Analista de Sistemas +
> mauro.brasil at tqi.com.br <@tqi.com.br> : www.tqi.com.br ( + 55
> (34)3291-1700 ( + 55 (34)9971-2572
> Red5 mailing list
> Red5 at osflash.org
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