I went back to watch an old video This one and it wasn't working. I thought it was just a fluke, so I tried every single other video on that page and nothing. I went back to an even older game, Horizon, and none of those videos are working either.
Your video player seems to only support new videos, maybe because of a certain file format. However if you are not going to allow old videos to be played - or you simply cannot do it - then at least remove them. Keeping these videos non-functional makes the site feel like a mess and incomplete, please plug these holes.