A few months ago, good developers from Google have explained in a blog post that the company will allow a user to mute an audio of auto-playing videos and this update will be released in next month, January 2018.
According to the reports, the company has been working on the upgrades to be released in January next year. If you want to use this version now then click on download to use a beta version of Chrome 64 released by the company.
The autoplay-muting setting is placed in the permission bar of the beta version and permission bar can be opened from the icon located next to the URL.
You will have to perform this operation n every website and it should have to block the unwanted sounds even when navigating the different pages of that website.
All other upgrades have been used in the beta version. Upgrades include stronger pop-up blocker along with a solid protection from harmful prompts that have a purpose of redirecting users to other websites.
It will also allow the users of Windows 10 to have HDR video playback in HDR mode. There will be split view can be named as a multitasking feature for Chrome OS along with other developer tweaks.