[streaming] Re: Piped input to VLC

[Chhaya, Harshal]

> 1.- Well i have been streming both through fast ethernet and 
> WIFI. When using fast ethernet i get a lot better results 
> through unicast compared to multicast, understandable because 
> ethernet switching in the case of unicast separates the 
> different colision domains. But in the case of WIFI, there 
> is no switch, the AP is a HUB, so unicast or multicast 
> should get equal result. 
> I think i'm missing something true? The AP has no MIMO, so 
> spatial stuff isn't a variable.Any idea?


The default setting on most APs is to send multicast at a lower
data rate than unicast so that all the clients can receive it. If
you are using multicast over a WLAN you will see lower performance
than unicast.

See if your AP allows you to change the rates at which multicasts
are sent. Some do.


> 2.- In the case that i buy a AP with Qos support, how do i 
> specify to give priority to VLC stream or is it automatic?. 

I don't know if there are any APs that you can buy today that 
have QoS support but there probably will be pretty soon. Anyway, 
you have highlighted one of the big problems with QoS - how to
get the apps to use it. The network guys expect the application
to indicate that it needs QoS but that is nearly impossible
because it would mean modifying vlc and all other a/v apps.
There is no clear answer right now but hopefully the vendors
will figure something out by the time the products are ready.

Regards,
- Harshal

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