Roto Brush issue

[Stefano23509836b0lx]

Hello,

I am using Roto Brush on After Effect but it does not recognise the subject I am trying to highlight. Everytime a skip to the following frame, the pink border does not stay in place and I have to select it all again. I have uploaded a video below as example. I tried with green screen and different color background but I have the same problem. Anyone have any suggestion? Thanks

[Mohammad.Harb]

please share the link of the video 

[Stefano23509836b0lx]

Hello Mohammad,

Sorry for the delay. Please find attached the Video .

Thankx

[Stefano23509836b0lx]

Maybe this is a better quality Video