Video import problem.

Can you explain the part about opening the video? Do you mean that you don't see video when you do a test movie? The H.264 on the timeline isn't an object you can open. You can change some settings in the library, but the video is not going to appear in either a test movie or an export.

Rotoscoping can mean a couple of things. Either you're tracing the frames of a video in a regular drawing layer, or you plan to have the video run as part of the scene. For example, as if a TV in the scene was showing the video. The H.264 feature isn't meant to work like that, but using the tracing in another layer approach you could create a scene that had a hole in it where the video is to appear.

To get the final effect you would combine the original video with a File/Export/Export Video (ignore stage color generate alpha) of your animation. You ought to not send the video to Media Encoder, and use the huge MOV file in After Effects or Premiere.

What kglad said about FLV would work, but there are challenges in making FLVs these days, and the quality wouldn't be as good as H.264.

Thanks for your response kglad.

Unfortunately, I do not understand your answer. For example, when I drag the components to the stage (the components are 'User interface' and 'video", broken up into the individual parts), nothing happens, for example there is a component inside 'user interface; called 'start button' - it is not dynamic, it just gets pasted onto the stage inertly.

I have attached a screenshot of my animate CC window. - you can see the blank window, which ought to play the video which has just been encoded, but nothing happens. I closely followed the guidance in a Youtube video 'Importing video in Animate CC' by DJO Lessons, Nov 22, 2016. everything seems to work fine until the end, when the video just doesn't open. do you have any further advice?

regards.

your playback component is in the components panel (windows>components) of animate.  drag it to your stage and check the properties panel especially for the source (your mp4).