[streaming] Re: Resolution Pc Vs Tv

[Jean-Paul Saman]

Psycho Ph wrote:
> Regarding to what you said I would like to ask this
> question in another way .....
> 
> Suppose I stream my video in about 4Mbps , which means
> in order to be able to stream 5 streams on my network
> I need to have a support for 20Mbps ,,,,,
> which means that If My hub can go only for 10 Mbps I
> will have a congestion .........

4Mbps streams is an average, which means that they can go up to 8 Mbps 
temporarily (VBR streams). Thus a network which is capable of handling 
10 Mbps for one stream will not function.

Calculating with your 5 streams the worst case will be 40 Mbps iso 20 
Mbps. You already concluded that your 10 Mb hub will not do. I suggest 
build a 100 Mbps network. It will allow for twice as much streams as you 
offer now and is not more expensive then a 10 Mbps Hub equipment (if you 
still can find one that only does that).

> The most important question is .... If am streaming 5
> Videos using vlc or vls with sap on the network and
> only 2 of them are being viewed would the total
> traffic on the network be 20Mbps assuming that each
> video is 4Mbps ?????

When multicasting over the network the 5x8Mbps (worst case) = 40Mbps 
will be occupied always. If you do however unicast things will be 
different, but from your description I deduce you'll be doing mulitcast.

> This is important for me cause I need to know what to
> tell the owner before I tell him to go and buy the
> equipments to install it in the platform ......

> The platform consists of 18 appartment and already
> have network connection to each appartment for
> internet .....

I suggest to measure what the current occupied bandwidth for 
internetting is and adapt your new network plan upon that measurement. 
Why? Because multicast streaming will certainly use UDP and on a 
saturated network segment these packets will be dropped first. Resulting 
in bad TV !.

-- 
Kind greetings,

Jean-Paul Saman



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