Very often AVI video will be compressed in "Fully Uncompressed / RAW" format which will result a huge file size. We can recompressed the AVI video to other codec compression that will reduce up to 90% of the file size. In order to reduce the AVI file size:
Run Videozilla > Preferences > AVI Settings:
Change the AVI Codec to other available codecs instead of "Fully Uncompressed", eg. DIVX, XVID, Cinpeak, Microsoft MPEG-4 Video and etc.