Video inside bubble?

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Hi. New to After Effects here, and I need some help.

I'm working on an animation right now, using After Effects to do a lot of the effects and speech bubbles. I have 2 video clips, both MP4. The first of those is a character sitting down with an empty thought bubble above his head, and the second is him eating a sandwich. What I want is a way to put the second MP4 inside of the thought bubble in the first video.

Is there a way this can be done? Any help would be appreciated

[Mylenium · Accepted solution]

If the bubble isn't a separate layer with transparency so it could instantaneously be used as a track matte, you have to draw masks or re-create the shape e.g. using shape layers to be used as the aforementioned track matte for the video inside. I suggest you read the online help on some of these basics.

Mylenium