For a beginner it's easier, in my opinion, to make a divx file in Virtual Dub.
First goto File|Open Video File, find your video and hit okay.
Then setup video compression:
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Then audio compression:
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Finally save the AVI file and let it encode the file out, it may take a couple minutes.
Keep in mind that all these values are in "Kilobits". A KiloBit is 1024bits or 128bytes of information.
1 x 8 = 1 byte x 1024 = 1 KiloByte x 1024 = 1 MegaByte x 1024 = 1 GigaByte x 1024 = 1 TeraByte.
You also want to make sure you choose the proper frequency that you exported your audio at.
Just to give you a idea:
Say you have a AVI file with a 600Kbit DivX video stream and a 128Kbit MP3 Audio stream.
600 divided by 8 = 75, so that's 75 KiloBytes
128 divided by 8 = 16, so that's 16 KiloBytes
75+16 = 91KB/sec.
So if your video is three minutes, or 180 seconds long.
That is:
91 x 180 = 16380KiloBytes. Divided by 1024 = 15.9 MegaBytes.
So if you do those calculations, then you'll have a idea what your file size will be. Now the file will not be exactly that size as the way most codecs work, they do not use a constant bitrate, so it may flucuate and use less during one scene and more during another. So it may end up being a bit larger or smaller depending on the footage you use.
~klinky