Online video not playing

We are using the windows application for showing a video on the web.
The video (mp4) is renewed every 3 hours and has always the same filename

We tried to use the webwidget with http://…video.mp4 : does not work
We tried to use the VLC application installed on the windows pc, and in the commandline the URL. Nothing happens ,

What is the way to do this (Local video or webwidget, or shell / VLC or./…) ?
What are the parameters and/or command line to do this

Thank you very much

PS: using CMS v2 alpha