mp4 is hanging, using blender created mp4

Question

ok, this is an issue, that might be a problem of video-js or a render problem of blender V2.67 I start with asking you ;-)

• I just wanted to try video-js and decided to create some simple video with blender (win7, file format mpeg) in order to have some demo video.
• using vlc and media player directly showed a working video
• using it with : shows the frame with poster and start button in a correct way
• pushing the button doesn't change the view, but adds a "waiting animation" as dots, turning in a circle
• nothing else happens

Using an ogg rendering of blender instead: works fine. It means, code and swf of video.js are fine so far

Any ideas?

If useful, i may send the demo video for further investigations and place the link over here. Just tell me and i will do so until tomorrow