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I want to split an existing large AVI file into a few smaller ones. How do I do it ?

Use VirtualDub's "select range" option to do this. Let's go through the steps :


Open Video file (the MPEG-4 AVI file)
Go to Video Menu, click on "select range", you should see something like this (for example, actual figures may differ) :


To cut this movie in half, divide 154955 by 2 = 77477 (if you want to divide into 3 equal parts, similarly, divide by 3) - remember this value, also remember the initial "length" value (154955).
To cut the first part, type the length of 1 half in the "length" box, eg. 77477, and make sure "start offset" is still 0 - press ok (see below)

Still in the "video" menu, select "Direct Stream Copy".
Save AVI - this will save the first half of your original AVI file, without needing to re-encode it (this process shouldn't take more than a few seconds, as opposed to a few minutes if you had to re-encode them).
Now for the second half, opent the orginal AVI file again, and go to the "select range" option again. Now type 77477 in the "start offset" box, and then type "0" in the "end offset" box and the "length" value should reflect the total length - "start offset" (eg. 154955 - 77477 = 77478). Press OK (see below)

Repeat steps 4 and 5 - and your second AVI file should have been saved.
You can follow this algorithm to split files into any length.