I'm trying to add a mask to my clip in the VSE but the menu stays empty.
Am I doing something wrong?
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2$\begingroup$ Did you create a mask in the movie clip editor first? $\endgroup$– Unnamed Sentient BeingCommented Jul 10, 2016 at 14:38
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1 Answer
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The first thing that you have to do is create a mask.
There are two places where you can do this:
In the Image Editor.
Or it can be created on the Movie Clip Editor
Go to the Motion Tracking Screen Layout and load in your movie. Select Mask in the bottom options panel where it probably currently says Tracking.
--> 
Click 
to add a new mask, or select the one you already made from the dropdown. Make sure your mask is named, so that you recognize it:
Key Ctrl + 
LMB to add a new control point. Keep clicking to mask your object. When done, key A once or twice until everything is selected and key Alt + C last to connect the polygon. If you want the mask to move, key I to insert a keyframe, move the time cursor in the Timeline, move the control points, and key I again. They will glide in between.
When you are done with the mask, go back to the Video Sequence Editor, and your mask should be there.
answered Jul 10, 2016 at 12:14
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$\begingroup$ @ideasman42 I didn't know that Image editor masks worked in the VSE. Thanks! $\endgroup$ Commented Jul 10, 2016 at 15:14
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$\begingroup$ @cetagon Thanks for the edits! It always makes me happy if someone can improve upon one of my answers. $\endgroup$ Commented Jul 10, 2016 at 18:44
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1$\begingroup$ I prefer to create masks in the UV Image editor for the VSE. You can simply hit F12 which creates a render from the VSE this allows you to edit the mask on top of the output from your edit. $\endgroup$ Commented Jul 12, 2016 at 1:30