@cyrano, I would be interested to see what is special about those videos, can you post (or email me directly) a small 1 second clip (take it with the cap on so it is completely black) so I can have a look?
@kirk, given that QuickTime on Windows has recently been declared obsolete, an alternative must sadly be developed, I guess. I'm sure you have thought of that already
But if not, perhaps a quick solution would be to link to e.g. exiftool in case of movie files to retrieve the necessary data? Perhaps this could even open up possibilities for retrieving more metadata than that is currently possible (extension to the {variables} like this
{exiftool:tag} perhaps?) Anyway, just thinking out loud