Network end users to pull down 2 gigabytes a day, continuously?

Wed Jan 10 10:56:27 UTC 2007

On Jan 10, 2007, at 5:42 AM, Mikael Abrahamsson wrote:

>
> On Tue, 9 Jan 2007, Valdis.Kletnieks at vt.edu wrote:
>
>> between handling 30K unicast streams, and 30K multicast streams  
>> that each have only one or at most 2-3 viewers?
>
> My opinion on the downside of video multicast is that if you want  
> it realtime your SLA figures on acceptable packet loss goes down  
> from fractions of a percent into the thousands of a percent, at  
> least with current implementations of video.
>

Actually, this is true with unicast as well.

This can (I think) largely be handled by a fairly moderate amount of  
Forward Error Correction.

Regards
Marshall

> Imagine internet multicast and having customers complain about bad  
> video quality and trying to chase down that last 1/100000 packet  
> loss that makes peoples video pixelate every 20-30 minutes, and the  
> video stream doesn't even originate in your network?
>
> For multicast video to be easier to implement we need more robust  
> video codecs that can handle jitter and packet loss that are  
> currently present in networks and handled acceptably by TCP for  
> unicast.
>
> -- 
> Mikael Abrahamsson    email: swmike at swm.pp.se