Hi.
I'm just getting into video editing myself and not sure what an ASF or SMR is but DIVX is a decoding program to look at MPEG2 or 4, something like that.
And from what I remember VCD is on of the worst format you can use. Its widely used still but you are still better off using MPEG2 and recording to CD.
A good source of info can be found at
www.videoguys.com.
They have a good online video editing manual.
Plus tom's has an article on video formats that you might find interesting .
Good luck!