Embedded videos will not play with Impress V7 on Windows 10 Home. This is not a new problem. Actually they play correctly if you select the slide, then use Shift-F5 to start the presentation at that point. However if you start the presentation anywhere before that, the sound is OK, but only a still shot instead of the video.
If I disable Skia, I don’t even get the still shot - just a black screen.