Zencoder
Zencoder is the creator of an open-source HTML5 video player, Video.js, built with Javascript, HTML, and CSS. Video.js plays video via native playback in all HTML5 browsers and devices, or through Adobe Flash when HTML5 playback is not available.
VBOX7
Now, Vbox7 uses HTML-5 video player and H.264/MPEG-4 AVC is its default video compression format. The site supports HD videos up to 720p.