Website embedded video stream in VLC
Open the web inspector and look in the resource list for the active network connection (indicated by the spinning pinwheel next to the resource) as this is usually the stream file.
Clicking the resource will show the Full URL under the Location section of the resource inspector. This URL can be added in VLC.
Note that some URLs won't be able to be played in VLC due to licensing restrictions.
If you have the source URL, then you can stream it with VLC.
VLC- File- Open Network.