I am a 3d guy. i create animations and want to compress them without facing those problems below. help me on this and i say thank you.

1. I want to chose no compression but it takes lots of mbytes. when i choose a codec i don't happy with the result so what is the greatest codec( for best quality)
2. Let's say i made different animations like intro1.avi with divx and intro2.avi. Then i want to make them one single file. but the program i used ask me to choose codec so it compresses the already compressed files and that decreases the quality.


If you can give some program and codec names that solve my problems i say thank you and i wish you have long days and beatifull nights.

Well... that's tradeoff with codecs... if want smaller size, you will have to sacrifice some quality. Most codecs like DIVX/XVID use lossy compression.

After you create the AVI files (with similiar compression, frame rate etc) just matter of merging them...using Direct stream copy/demuxing rather then using recompression.

VirtualDub Mod will allow you merge two AVI files together:
http://virtualdubmod.sourceforge.net/
You also try do a search for many freeware AVI,MPEG joiner software on the market.