[Asterisk-video] video RTP question

[sergio.garcia@fontventa.com]

Hi all, 

I agree that video support in  asterisk is quite .. umh.. how to say it.. not as good as it should. But i have never found the lack of the rtp headers to be a problem. Every info you need to rebuild the rtp header is in the asterisk frame.

Best regards
Sergio

Enviado desde mi teléfono Orange HTC Android.

----- Reply message -----
De: "Neil Stratford" <neils at vipadia.com>
Fecha: Lun, ago. 24, 2009 17:37
Asunto: [Asterisk-video] video RTP question
Para: "Development discussion of video media support in Asterisk" <asterisk-video at lists.digium.com>


> I'm not sure that the marker bit is passed through if the header is
> stripped. Let me know how to access the marker if it is stored
> somewhere. I may have just overlooked it when I read the code.

IIRC it is in fr->subclass:

if (mark)
    rtp->f.subclass |= 0x1;

> The frame rate would also be necessary to update the time stamp. In
> theory, you could use the system clock to measure time between RTP
> packet reception. In practice, I don't know how well this works over
> real networks with packet loss, and real encoders that may drop frames
> due to negotiated bit rate limits. I'll have to think about this
> carefully for a while.

I agree - there are likely issues with sequence number jumping as well. 
The same issues apply to playing video out from a file, so it would be 
nice if it was all done without relying on RTP headers.

Neil

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