Why are avi videos so big?

Question

i wanted to upload a video on youtube and the avi file was almost 2gb while the wmv was less than 1gb and what video format is generally the best?

Answer 1

Avi image quality is generally better due to the type of encoding but wmv is still fairly good and a smaller size.

Answer 2

wmv compresses the file more than an avi file but avi files are generally better because if you post your videos on websites, it is more commonly accepted.