[Asterisk-video] announcing bandwidth in SDP

[Klaus Darilion]

First test:

I added the same string as eyebeam adds in the "Cable, DSL" setting to 
the SDP: a=fmtp:103 QCIF=1 I=1 J=1 K=1 MaxBR=4520

Result: The 3G handset did not showed video at all.

Then I added only the MaxBR setting:
a=fmtp:103 QCIF=1 MaxBR=800

This works fine an Eyebeam video is diplayed on the 3G handset.

Values >800 improve video quality, but video delay is steadily 
increasing (shouldn't there be some packets droped to avoid to big delays?)

Values <800 improves delay (video is getting real fast) but decreases 
quality.

regards
klaus

Sergio Garcia Murillo schrieb:
> Great, but does EyeBeam comfom the strictly the traffic to the desired bandwith??
> 
> I'll be very interested in knowing the results, if you got a video recorded that way send it to me, I'll try to take a look at the video stream to see how "good" it's for directly using it with the videocall.
> 
> Best regards
> Sergio
> 
> ----- Original Message -----
> From: Klaus Darilion [mailto:klaus.mailinglists at pernau.at]
> To: asterisk-video at lists.digium.com
> Sent: Thu, 17 Jan 2008 12:17:35 +0100
> Subject: Re: [Asterisk-video] announcing bandwidth in SDP
> 
> Klaus Darilion schrieb:
>> Hi!
>>
>> Is there an Asterisk version (trunk, videocaps branch ...) which allows 
>> to signal the maximum video bandwidth (e.g. b= or a=fmtp:...MaxBR=)
> 
> 
> Answering myself: there is maxcallbitrate in sip.conf. It adds b=CS: to 
> global section of SDP.
> 
> Looks like it is ignored by eyebeam, which uses MaxBr setting in a=ftmp 
> line which was defined in a rather old SDP draft.
> 
> regards
> klaus
> 
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