general question on media formats: avi,mpeg etc..

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revenge2

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Ok, so i got like 4 .avi video files which all range from 20-23mins each.
And 3 of them are between 135-160mb. The remaining one is a whopping 208mb when compared to the other 3.

Why is the last one so freakin big??? oh and they all have the same aspect ratio .
 
The audio could have been encoded with something different than the other 3, or it could have been encoded at a much higher quality.
 
The video codec being used is pretty important, too. Some codecs compress better than others. Some avi's are uncompressed, and some use a video codec but have uncompressed audio. There are many possibilities. Usually a video dumped straight off of a camera is larger than one that has been edited and rendered with some kind of good codec.
 
Different qualities contribute to different filesizes. Other things are compression, for example the use to Divx or Xvid.
 
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