I have seen your MTI vid, and I totally sat there for the first part thinking, "Wow, really good lipsync!" And then it got off a bit in the second half, and my inner AMV fan went :-( But it was a great vid, regardless.

Also, wrt making lips move to the music... in my experience, you can't really do that with live human beings, because we can tell that they're not saying the same words.

Yes, totally. Whereas with anime, due to low budgets particularly in older shows, the only thing moving in a frame will be a character's mouth, and maybe their eyes. So lip sync (or at least just cutting the lip flap) becomes technically much more feasible. (Though it still takes skill and practice to do well. If there is lip sync in my AMVs it is completely serendipitous, because in the past I haven't been arsed to try.) Also in anime, maybe, emotionality is not quite so strongly linked with characters talking, but I wouldn't want to take that too far.