All videos are in .webm video format.
iOS users will need to do two things to view videos:
Other users who cannot play the videos
Some devices just won't play the videos for some reason, so may be try another device instead.
More technical stuff
The exact video format used on this website is WebM VP9. The audio is Opus. No other format is supported.
Still didn't workIf you continue to have problems, use the bulletin board to let everyone know, give details like: which device your using, does your device support WebM (if you know), etc.