How to allow video autoplay in a Google Chrome kiosk app in version 66 or later
As of version 66 of Google Chrome onwards it will no longer automatically start playback of audio and video files when the playback volume is not muted. This change was made to prevent autoplay on ad videos and other annoying web page elements. However, this has negative consequences for a number of perfectly valid applications of the autoplay feature, for instance in signage applications. The new default behaviour of not auto playing a video with sound can be overridden at the startup of the Google Chrome browser with the command line options --autoplay-policy=no-user-gesture-required or --no