Not easy, I agree. But once you got how it works, it beat every other software hands down.
You've seen the screenshots? Just take the time to learn how it works. BTW, you don't need the DGindex for M2t to m2v : just use that template here (copy/paste in a .txt file what's in the box below and rename to .avs):
Replace the "yourfile.m2t" with the complete path, ie: "C:\Video\yourfile.m2t".
b = directshowsource(filename, fps=23.976, audio=false, convertfps=true)
AddBorders(b, bordersizeX, bordersizeY, bordersizeX, bordersizeY)
Spline64Resize(720,480) # Spline64 (sharp)
Be sure the FPs are set correctly, the bordersizeY is usually used to add black borders on top/bottom for cropped project.
The spline resize is the best filter (to me) to resize your video.
Use (720,576) and 25 for FPS if you're in PAL land.
Feel free to PM and i'll answer your questions.