On Friday 23 June 2006 12:10, Dieter wrote: > > Ummm... Yeah. HD->SD conversion is even more intensive than HD > > decoding (think decoding plus resizing). That is, unless someone's > > snuck in an ingenious algorithmic trick that can be used to pluck > > an SD stream out of an HD one... which I suppose is quite possible > > (I certainly wouldn't know). > > I read somewhere about some encoding that was designed to allow this. > There was some problem with it, probably large file size.
It's called bitrate peeling. There is some support for it in Ogg Vorbis (used by streaming servers IIRC) but you get a higher bitrate (in the original stream) and less quality (in the peeled version)... Lourens
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