Rotor brush outlines disappearing

[misterm89412858]

I'm doing a rotor brush sky removal from my DJI drone footage.  I did my rotor brush work to outline the high rises and the sky line.  When I'm clicking the 'page down' button on my keyboard to render each frame by frame things look pretty good up until I get to around frame 19 and then the lines disappear.  Then I have to re-rotor everything starting at that frame, but even these new lines disappear again after a few frames.  

This is frustrating because FINAL CUT doesn't mess up like that.  I've tried it on some other footage using After Effects and it is the same problem.   Please help.  

[Mylenium]

Without any idea about your footage nobody can tell you much, but it simply seems you're using the wrong tool for the wrong task. Drone footage can have all sorts of issues and semi-automated stuff based on analytical functions like Rotobrush can get thrown off. The behavior definitely implies that RB is actually working correctly, it's just that after a while the feature deviations get too big for its algorithms. You may need to pre-process the footage or use another method entirely.

Mylenium

[Mo Moolla]

The lines dissapearing simply means the roto has broken on tat frame due to things like sudden movement of the cam, lighting fluctuations etc. 

If you are doing complex drone shots go the Mocha Pro route to travk and rplace.

It will not ever break in Mocha

Mo