Re: [Madwifi-users] High throughput

[John C. <jc...@me...>]

Derek Conniffe schrieb:
> Hi John,
>
> For TV transmission surely it wouldn't matter?  I'm not sure how a DVB-T
> receiver tries to blur over bad packets received (over VideoLan or any
> streaming player) but the TV can't receive them again either and I know
> that if the reception is poor it does glitch a bit on-screen.

While the details of video are not particularlly 'on topic' for the 
madwifi list... packet dropping
effects usually exhibit the 'macro blocking' look on the receiver. On 
can see this effect in satelite
links when there is fading due to atmosphic conditions, and big chunky 
blocks appear on the
screen. Terrestrial links have fading as well, but far more infrequently...

Depending on the encoding and the block that is lost, the effect may be 
as minimal to the
human viewer as 'a glitch' in the smoothness of the video, or the big 
chunky blocks, or
just black screen when the is too much loss.

If one needs to maintain 'fit for broadcast'... the loss of a block is 
significant. So, in the case
of using an 802.11 solution, one begins to think of how to absolutely 
guarentee bandwidth, multiple
devices, expensive filters, etc. but even after all that, there still 
may be some dropped blocks...

John Clark.