[vlc] Re: VLC vs QoS

[Warren Young]

Pablo Andrés Orellana Vega wrote:
> sorry i dont understant the "lite"....

It's a variant of UDP that lets peers say that only part of the packet 
is covered by the checksum.  In regular UDP, the entire packet is 
covered by the checksum, so that if even one bit is damaged, the whole 
packet is discarded.

This is useful in streaming media programs like VLC because if the 
damage is only in the media payload area (as opposed to RTP headers and 
such), it's usually better to pass it through as-is than to drop it.  If 
you drop the whole packet, you get a big blip in the stream, but if you 
let a small bit of media corruption through, the blip might not even be 
noticed.

Read this for more info:

	http://www.hpl.hp.com/techreports/1999/HPL-IRI-1999-001.pdf

(It's the fourth result in a Google search for "UDP-lite".  Hint, hint.)

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