[vlc] Re: Problem streaming over wireless link

[Joel Jaeggli]

On Wed, 16 Nov 2005, Sigmund Augdal Helberg wrote:

> On Wed, 2005-11-16 at 10:38 +0100, Petr Hroudny wrote:
>> Hello!
>>
>> I like to stream over wireless link conecting 2 buildings.  The link is able to give me 1,2 MByte/s downloads over FTP.
>> I used UDP stream option, but the result is very bad. The picture is distorted and  VLC prints several discontinuity and other errors.
>> Even very low bandwidth videos don't work correctly.

realtime video tends to be fairly intollerant of loss due to queuing and 
retransmission on a ap since getting out of order packets a few hundred 
ms after you given up and played the frame with the data missing doesn't 
do you any good.

knowing how the ap's were configured would go a long way towards 
suggesting a fix. assuming they were g, I'd probably turn off b support, 
and set the multicast rate rather high, so that beaconing and broadcast 
traffic don't happen at some radically slower rate affecting your other 
traffic.

> Assuming you have one of those 54mbit systems then the theoretical max
> transfer rate is 54mbit/s while you get about 10mbit/s. This means
> (oversimplifying dramatically) that 4 out of 5 packets are dropped. With
> ftp that runs over tcp these packets are retransmitted, but with udp
> they are just sent with the hope that they will arrive properly. If
> still 4 out of 5 packets are dropped then you will certainly get
> discontinuities.
>>
>> Is there some special setting for wireless links necessary?
> Try any tcp based streaming protocol, like http.
>
> Sigmund
>
>>
>> VLC version is 0.8.2
>>
>> Thanks,Petr
>>
>
>

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Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu
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