The latest version of Chrome (Version 27.0.1453.110 m) as of 5 June 2013 does not play mp4 videos. For an example W3Schools Video Sandbox gives me video controls and nothing else. (Sorry can't post a screen shot, just signed up to StackO.)
Anyone know why?? and a fix?
Yes:
There is an answered question like this
chrome could play html5 mp4 video but html5test said chrome did not support mp4 video codec
and
There is an unanswered question like this: