Compressing an AVI File by a Moving Integration & Media Player

With programs like registax, k3ccd, or astroregister (?), is it possible to shoot a
few minutes of sky at say 10 frames of second in avi format, and then stack
sequentially 5 or 10 frames intoa new image, then stack the next 5 or 10 frames into
a second image, etc. so the resulting stacked images are in a avi file? For example,
if my avi has file has 100 images, can I automatically sum each
successive group of 5 into a new image to produce a new file with 20 images?

The end result of this process should be a shorter movie with individual images
created from successive sections of the original.

This reminds me to ask the following question. I'm creating a sky image at 4 avi
frames per second, and, when I playback the avi file, it plays back in MS Media
Player as slowly as it was created. Is there a way to speed the playback up to 15 or
30 frames a second?

--
Wayne T. Watson (121.015 Deg. W, 39.262 Deg. N, 2,701 feet, Nevada City, CA)
-- GMT-8 hr std. time, RJ Rcvr 39° 8' 0" N, 121° 1' 0" W

"Don't you just hate it when someone leaves their call back phone
number at 100 digits a second? And worse. At the end of a long message."
-- Andy Rooney (in disguise)

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