how do I know???

[eiht]

if a movie is VCD or SVCD

[Vejita-sama]

You need to determine if it's MPEG1 or MPEG2. Although there are lot of ways to do this, I've found the easiest is to:

1) Run TMPGenc, choose MPEG tools, simple-demux
2) Look at the video file that will be produced (don't have to run de-mux)

m1v = MPEG1
m2v = MPEG2