Roto Brush Tool Problem

i using ae 2017 , having problem roto brush tool. when select object isolate, , press pg down go next frame, adjusts pink line, should. after 20 frames, though, drops pink line , have start on again tracing. working 2000+ frames, don't want have way. there another, faster way roto frames?

you need study of tutorials. type rotobrush in search field @ top right corner of ae , study on community resources , files. i've been using ae since version 1 , couldn't figure out how use roto brush @ first time saw it.

 

when study find key in little indicator @ bottom of timeline.

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