Can anyone give a concise instruction on how I can have a flv play from my html page please?
You can try https://github.com/Bilibili/flv.js
With flv.js, You'll get:
Flv.js utilizes MSE (Media Source Extensions) therefore it'll only be available on Chrome 43+, Firefox but not Apple / iOS Safari.
Flv.js instantaneously transmuxes flv streams to H.264 streams and then push the H.264 stream to Media Source Extensions. It'll display as a video tag in HTML Element with a blob URL.