Perfect Automatic Masking (Not Frame by Frame) - ADVANCED AE

I was playing with some animating features in AE today and I found a really cool way to mask stuff really quick. Basically, you import your footage in AE, make sure there is no ghosting (in vegas it's the disable re-sample setting) and then import to animate that clip in Mocha AE (bullt-in plugin for AE CS5+). Then you mask the last frame and hit *Track backwards*. It should mask the rest of the clip automatically.

Now go back to the first frame and check if the mask is perfect, if it's not then fix it (it maybe isnt perfect for a cm or two) and that should fix the rest of the frames too.
Now export Shape date and copy to clipboard.

Close Mocha, select your clip and go to Edit>Paste. Voila! Automatic masking in AE !
Just make sure the first mask you make is perfect because if it isn't, then the rest of the clip won't be either.

Here's a small example of what i'm talking about:
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The vid is not for nooby AE/mocha users because it goes really fast and doesn't explain anything and my tutorial as well because I'm really lazy to explain step by step so all you n00biz out there mask frame by frame!
I tired it on 5 different scenes and it worked perfectly.. Peace!

oh yeah damn i forgot about the part where you track the area.. just watch the tut n00bz

This is pretty awesome way to mask, better that rotobrush too :P

it may seem quite tedious if you're new in AE but it's pretty damn easy too .

I have already made a mask with it :D
took me around 5-10 min

my first mask took me that much. now ive gotten pretty fast-already masked 15-20 scenes
there are plenty of settings and workarounds i discovered in mocha to make the masks perfect. I'll post them later :3

After effects,yyy so advaaanced

can't wait to see the time you learn the edit button though

lol