Video format not supported.
I have updated to versión 1.3 of H5P, and then I have tryed creating a new interactive video.
The first problem that I'd got was that that I couldn't pass to step number 2, Adding interactions. The screen to add the video seemed to miss some styles as the buttons to go to previous and next steps where unformatted and only text could be seen.
So I decided to remove H5P plugin and reinstall.
Now, I can see the edition screen with the correct view in the buttons, but, after uploading a video (.mp4) I get the screen you see in the 1st attachement when trying to add interactions.
In this last Moodle I updated the plugin and the libraries, but I did not reinstall.