Invisible wrote:
> There's also some fun with different frame types. 

That's the main place the ambiguities come from. If you don't understand 
the ways in which you can build a B-frame, you're not going to see where 
you can get good quality at low bitrates for video with things moving.

MPEG1 had motion prediction too. It's just that the CPU power needed to 
do it never got cheap before MPEG2 came out.

Back in 1991 or so, I worked with someone who encoded 6 minutes of Star 
Wars as MPEG1 for testing video on demand. They sent it out to a place 
that had a specially-built cluster of machines for doing this work, and 
it took several CPU weeks.  (This was in the same timeframe where doing 
jpeg compression needed special hardware cards in a PC, to the point 
where it was faster to ship the image to the PC with the card, compress 
it, and ship the results back, than it was to do in software.)

-- 
Darren New / San Diego, CA, USA (PST)

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