Problem with Video.js PlugIn

I get the following error message when using the Video.js Plugin.
I tried with different mp4 video files as well as with dynamic and static video sources (all hosted on AWS)

Error:
“The media could not be loaded, either because the server or network failed or because the format is not supported.”

What I am trying to achieve is a video upload via file uploader and displaying the video afterwards.
YouTube links work.

Any help is much appreciated.

Best,
Carsten

I finally found a file which woked…Now I know it is generally working however I need to gather the details of the supported file types. Solved for me.