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What frame size do you create at and what size do you compress the MPEG1 at?
Can you get more out the format by increasing frame size and data rate?
Apart from that Flash video can play in Director and doesn't require any installed codec
Well, I’m not a Director God so I’m going to suggest a low tech solution. I would also like to offer the following disclaimer: I have not tried this myself, frankly, IMHO if the user’s computer is from the last century broadcast quality video is probably the least of their worries ;-) We get around this problem by making XP-SP2 the minimum spec although most of our multimedia will in fact play on Win 2K and 2003 if the media player is up to date (for the codec’s)
How about supplying two video formats, a low bandwidth MPG1 for ancient machines and something more recent like 720x480 MPG 2 or 4 for more recent computers. You could use a variation of the following script to test for a particular codec or you could use Buddy API to detect the OS vintage (you might even find a way to get the directX version) and make an educated guess on available codec’s. Once you know which codecs are available, branch and display the appropriate video.
Codec detection script (old but probably still works): http://www.mediamacros.com/item/item-1005643990/