webm not appearing as n option in h5pIV
I was trying to publish an interactive video with different formats available. I used 4 different resolution in mp4, and 3 different webm created from converting the same original mp4 with different converters. They are all uploaded in the streaming repository in moodle so links have been successfully pasted and saved in the h5p "add a video" tab as in pict1. When I save and try to play it only the 4 mp4 are available options (pict2).
Suspecting a local server problem I looked for a publicly available link to a webm example and tried to do the same. This is the linked webm https://www.html5rocks.com/en/tutorials/track/basics/treeOfLife/video/de... despite appearing in the add a video section (pict3) it generated the output shown in pict4..... Opening the "add interactions" tab looks like pict5
This happens on MacOS Mojave 10.14.6 with Safari, Firefox and Chrome.
In conclusion, no webm format are played from the h5p interface, while each of them would be correctly payed if linked to an ordinary moodle page resource. The source of the webm file seems not to be relevant, as well as the "correctness" of the final format (different convertions tried but to no avail) and the browser used.
Please, where should I go and look for to set it to do the right thing?