[vlc-devel] Re: Multicast streaming over wifi

[Greg Shepherd]

On 11/5/06, Rémi Denis-Courmont <rdenis at simphalempin.com> wrote:
> On Sun, Nov 05, 2006 at 05:54:44PM -0800, Greg Shepherd wrote :
> > ...or implement an FEC. :)
>
> AFAIK, you can't implement Error Correction on top of UDP. The
> most-likely-failed checksum will cause the packet to be discarded in the
> IP stack, before being passed to the application.

Sure you can, and it is done in many ways today. Some of the more
effiecient FEC solutions today do not affect the original data stream.
They simply create an additional stream of repair symbols to a
different port. The application (or a shim before the app) repairs any
loss of the original stream with the repair symbols.

Just google FEC UDP and you'll be overrun with whitepapers. These guys
have been at it for years and are the clear leader in several key
industries:

http://www.digitalfountain.com/

Enjoy,
Greg

> UDP-Lite would solve the problem, but nobody implements UDP-Lite
> (not even Linux yet),
>
> --
> Rémi Denis-Courmont
> looking for a job
> http://www.simphalempin.com/home/infos/CV-en.pdf
>
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