The easiest way to play videos in HTML, is to use YouTube.
Converting videos to different formats can be difficult and time-consuming.
An easier solution is to let YouTube play the videos in your web page.
YouTube will display an id (like tgbNymZ7vqY), when you save (or play) a video. You can use this id, and refer to your video in the HTML code.
YouTube Autoplay + Mute
You can let your video start playing automatically when a user visits the page, by adding autoplay=1 to the YouTube URL. However, automatically starting a video is annoying for your visitors!
Add mute=1 after autoplay=1 to let your video start playing automatically (but muted).
Add controls=0 to not display controls in the video player.
Value 0: Player controls does not display.
Value 1 (default): Player controls display.