In T215360 I requested video embeds to be enabled for other video formats than OGV.
Instead, even OGV files no longer play! :(
The old file F28128844 can still be played:
The new file F29785397, which I uploaded today, can not:
I note that the old file has "Mime Type: application/ogg", while the new one has "Mime Type: video/ogg", although I couldn't tell what causes the difference when examining them. They are both pretty normal boring video files.