What video types does S3 Media Maestro support?

MediaElements.JS Media Types MIME Type(s)
Native video/audio video/mp4, audio/mp4, video/webm, audio/mpeg, audio/mp3, audio/ogg, audio/oga, video/ogg
Vimeo video/vimeo, video/x-vimeo
YouTube video/youtube, video/x-youtube