Masking in After Effects

i have video mask subject giving lesson.  moves , forth , evens raises arms @ time.

 

i looking try , alpha out background , keep speaker shown, each time try moves out of mask , when arm not in mask.

 

is way keep subject within mask using track mode.

 

i have tried in both aef cc5.5 , cc2014.

 

thanks,

jeff k.

this called rotoscoping , there various techniques achieve "roto". choosing proper technique based on type of footage. if upload part of footage via legit cloud service, give pointers. whole thing!

 

in meantime here resources:

managing , animating shape paths , masks in after effects

use roto brush in after effects

roto brush , refine matte in after effects

after effects cc tutorial: rotoscoping paths | lynda.com - youtube

More discussions in After Effects

adobe