Convert an AVI to a GIF

You need VirtualDub:
for cropping: select a filter "null transform" and click "cropping".

Export as "Animated GIF"

A very good text is: http://www.imagemagick.org/Usage/video/

Basically what you need to do is:
convert source.gif -ordered-dither o8x8,23 -append -format %k info:
and keep making lower/higher the "23" until you find a number just under 256.

Afterwards do:
convert source.gif -ordered-dither o8x8,23 +map target.gif

And you have a nice full motion movie in GIF in the most optimal compressed format!

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