Before uploading a video to the site, please make sure it is an MP4, using H264 encoding.
Following an upload double check that it plays in the browser. If it does not, then you should delete it yourself. You can try re-encoding (transcoding) it using ffmpeg or Handbrake - other tools are available, but these are both cross platform and free.
Other codecs such VP-9 and H265 are not supported. Other video containers such as MKV are not supported either.
Anything that fails this will be deleted by staff.
These requirements are in place as to ensure the videos are viewable by all users of the site.