Auto-playing of videos or audio can be an annoyance factor that can cause people to bounce from your site. Keep your site visitors in mind, not what you think is “cool” or “great”.
Remember, people like to consume information differently. Some people like to read. Others like graphs, charts, diagrams, and yes, video and audio. Give your site visitors the option to engage with your content. Those who like to read will find videos and audio tracks that auto-play annoying.
One thing to consider is where your site visitor maybe located when visiting your website, like a coffee, a hospital, a nursing home, or a restaurant. You get the picture. It can creating an embarrassing affect or the site visitor and a shocking affect on those around them. An immediate reaction could be to close the website page and not return.
Don’t cause people to bounce from your site because of auto-play.