Rotobrush Freeze showing 805 frames but video contains 804 - Ideas?

Hi, I am rotobrushing out an object from a video that is 25 fps and contains 804 frames. I have specified in AE that time display be frames with first frame starting at 0.  In composition view timeline shows 0 as first frame and 803 as last.  That is what I expect. But when I freeze rotobrush it says 1 of 805, 2 of 805, etc.

I just want to make sure AE isn't doing something that is going to result in my img sequence being out of sync with my subsequent camera solve animation. I have solved camera in SynthEyes, and it shows start frame 0, end frame 803. 

Should I just ignore what the Rotobrush freeze is showing?

thanks