[vlc] Re: multicast over wifi

[Joel Jaeggli]

On Thu, 10 Mar 2005, Chhaya, Harshal wrote:

>> I'm using a Pinnacle TV card to multicast a TV channel over a LAN.
>> All the recipients over the cable are able to receive the
>> multicast well. However, in the laptops receiving the stream over
>> wifi, the picture and sound quality are very bad. Even with laptops
>> placed close to the transceivers.
>> What should I do to improve the reception?
>
> Hi Faizal,
>
> The wireless LAN protocol requires that broadcasts and multicasts
> be sent at lower rates than unicast packets. The coding used at
> lower rates is more robust to interference and this ensures that
> everyone in the network can receive the packets successfully.

you can actaully force the multicast/broadcast rate higher at least on 
enterprise ap's. On a b network setting it 5 or 11Mb/s will cause you 
usable range to substantially decrease.

> You can check this by looking at the recd data rates on the
> clients.
>
> Check if your WLAN AP has a setting to change this behavior.
> If it does, just tell it to send the broadcasts/multicasts
> at unicast rates.
>
> If not, you may have no option but to send multiple unicasts
> for the wireless clients.
>
> BTW, I am more interested in how you multicast live TV. Does
> Pinnacle provide the software to do this or you using a
> 3rd party or custom app to stream the video?
>
> Regards,
> - Harshal
>
>

-- 
-------------------------------------------------------------------------- 
Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu 
GPG Key Fingerprint:     5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2

-- 
This is the vlc mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://www.videolan.org/support/lists.html