Ask HN: I need a full featured open-source HTML5 media player that runs on JS.

It is not very hard to write you own HTML5 media player. I got this book and found it very useful http://www.amazon.com/Definitive-Guide-HTML5-Experts-Develop... In addition, MSDN also has a bunch of very informative tutorials on HTMl5 Video player.

Why can't you just use the basic video tag?

http://www.w3schools.com/tags/tag_video.asp

mediaelement: (http://mediaelementjs.com/) works well for audio - haven't tried it with video but i'm sure it's good.

do you mean something like http://flowplayer.org/ ?

Exactly like that, but it cannot be used on commercial products. At least for free. Any other suggestions?

I've only ever used flowplayer, so I can't really speak for how anything else works, but I found http://jplayer.org/ which looks like it might work, and is MIT licensed. Otherwise maybe look through this list: http://blog.insicdesigns.com/2010/06/best-html5-media-player... and there might be something suitable.