Thread:Extension talk:Html5mediator/Update which gives the possibility to upload and use "webm", "mp4" and "ogv" video files as alternbatives/reply

This works for me, but I had to switch the "$data = $image->getFullURL;" lines to "$data = $image->getCanonicalURL;" as I use a protocol-independant $wgServer setting, so there was no http: or https: at the front of the File names resulting in an error 20. Not sure if there's a better way to do it.