Re: announcing bandwidth in SDP

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.mailinglistspernau.at]
To: asterisk-videolists.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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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.mailinglistspernau.at]
> To: asterisk-videolists.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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om--
> 
> asterisk-video mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-video
> 
> 
> 
>
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Part 2: Attached is the patch for chan_sip if someone wants
to try it.

You can specify the bandwidth with
   maxcallbitrate_h263p=value
where value is the bandwidth in kbit/s. Note: this only
works in the 
global section. value=80 is a good value for H324M calls.

The added SDP line will be:
a=fmtp:103 QCIF=1 MaxBR=value0
(maxbr is bit/100s)

If 0 then no SDP line will be added.

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.mailinglistspernau.at]
> To: asterisk-videolists.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
> 
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.c
om--
> 
> asterisk-video mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-video
> 
> 
> 
>
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------------
> 
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.c
om--
> 
> asterisk-video mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-video

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