How can I display a MP4 video in a Picture node?
This is possible, though it seems like there’s a bug in GoJS 1.7 that’s disallowing it from displaying. Sorry about that. This will be fixed in the next release, probably in about a week.
Generally GoJS will not display animated videos, but you can force the Diagram to redraw in a loop so that the animation does occur. Depending on the side of your graph, this could be very inefficient, so you will have to do so at your own risk.
Here is an example of that. Note that this is using 1.7.4, because of the bug in 1.7.5 onwards. That will be fixed in the next release though.
This bug has been fixed in the latest release, 1.7.21: