removing background on video clip with roto brush
So i am new to Adobe After efects. I was trying to remove background with roto brush it seems it removes only one second and I Need to remove at least 1minute. Or then I need to select the object all over again with roto brush. It will take whole day to just remove background for 1 minute clip. How do I remove background for whole clip and not just every time for one second.? Please help

