[vlc-devel] Re: Multicast streaming over wifi

[Greg Shepherd]

On 11/5/06, Mark Moriarty <mfmbusiness at earthlink.net> wrote:
> Nature of the beast -- multicast means you're sending non-ACK'd UDP
> multicast payload.
>
> If you control the WiFi network, you might try nudging the network speed
> down a notch.
>
> Otherwise, switch to an ACK'd protocol, such as mms, plus play with the
> caches to allow enough time for the retransmits to occur without having to
> drop frames.

...or implement an FEC. :)

Most of the effort for FECs over streaming is ideally suited for
random loss at the last mile. But many of the applications of these
FECs are targeting the network elements and not the encoder/sender. I
think this is more market/biz-model driven and not a technical
limitation. So players with a stake in the infrastructure - both
vendors and providers - are leaning toward application of the FEC into
the network, and players with content who just want eyeballs clearly
need the implementation in the application encoder/sender/receiver.

That said, VLC would be an ideal candidate for an FEC. With the
growing list of FECs available, both public and proprietary, and
stream FEC signalling mechanism may be the right direction for FLC.

http://tools.ietf.org/wg/fecframe/

..as a suggested starting point.

Cheers,
Greg

Greg

> -----Original Message-----
> From: vlc-devel-bounce at videolan.org [mailto:vlc-devel-bounce at videolan.org]
> On Behalf Of Goldenear
> Sent: Sunday, November 05, 2006 2:42 PM
> To: vlc-devel at videolan.org
> Subject: [vlc-devel] Multicast streaming over wifi
>
> I'm experimenting multicast streaming over wifi and it doesn't work properly
> (too many packet lost).
> Would it be possible to implement a solution for this in VLC ?
> I found this:
> http://www.broadcastpapers.com/whitepapers/Unequal-and-Interleaved-FEC-Proto
> col-for-Robust-MPEG-4-Multicasting-Over-Wireless-LANs.cfm?objid=32&pid=42
> Don't you think something like UI-FEC could help.
>
> Regards,
> Nicolas.
>
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