Wandering mask points

[szazs]

I have a comp where I built a draw mask involving many points over eight seconds of footage. When I save and close my workspace and later open it back up, the placement of the mask points have “wandered” away from their original placement location, making the whole masking exercise useless. This has turned a simple project into an ordeal. WTF? Thanks in advance for any helpful ideas.

[Amir Shabazz]

Hi Szazs,

It is hard to say exctly what you mean, because of your description. However if you mean that you control point has offset from the point you put it. It may have something to do with one of two things. First off check that you have the safe framerate. For example, your frame rate is consistance. You do not have your material in at 29.97 and you are working at 24 for example. I am going by memory, which sucks :wink:, but this can cause a problem. Same kind of idea, but with resolution differences. I am not in front of my computer at the moment, but I think this also a cause. However the frame rate thing I think is the one. Just check those things first.

[Stanley Jones]

Thanks, Mark. I asked my client when I received the footage, so unless he’s wrong, the speed isn’t the issue; maybe the resolution, I’ll check. I’m trying to incrementally save this thing – little by little – but this control point wandering thing has me stumped. It happens regardless of how short the saved footage clip is, all I have to do is save, close, and open to find some of the control points have moved around, sometimes exchanging places so the mask edge covolutes back upon itself or forms a loop…Hmmm…

[Amir Shabazz]

Hey,

Well if you are comfortable with it, you can send me the file at [email protected] and I can have a quick look. If not I understand. However, when you load the file and the points are off and you try and move that point, does the point seem to move in funny directions to the direction you move the mouse? This would help me.

Thanks

[Amir Shabazz]

Hey,

Ok I just wanted to make sure my memory is not going bad, so I tested what I was trying to explain and I was correct.

So it is like this, and this is not to say this is what is happening to you, but if you load some 3:2 material for example. You then proceed to load it into a composition and then change the frame rate to 24fps. You start to roto and you finish your roto and then go back to work points. The point can move in all kinds of directions. Even if you remove the 3:2, but you lead the loaded materials settings at 30 or 29.97 you can still have issues with floating points. The only way to deal with this is to make sure that all your material is at the correct frame rate. Forget about the resolution I was thinking of something else. If all this is cool, then I will need to see the roto.

Cheers

[Michael Pekic]

yup, always make sure, your footage and the comp where the mask op is in has the same frame rate.

-rayk

[Stanley Jones]

I also found that if the Animation preference for Keyframe Interpolation is set to “Linear” instead of “Bezier” it helps a lot, too. Thanks for the input…life goes on…

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