Many browsers, particularly the most recent versions, automatically block videos from automatically playing, particularly ones with audio.
Most mobile devices, including Apple iPhones, Apple iPads and many Android and Microsoft devices do not support the video autoplay feature so your video will not play automatically if a visitor is on one of these devices.
Some desktop or laptop browsers also automatically block videos from automatically playing or may automatically mute the audio.
In some cases, even when the device and browser are compatible with autoplay, the video may not start playing immediately. Typically this is because the rest of the page assets are loading or the video file is still loading or buffering. In most cases, once enough of the page content or video clip has loaded to ensure smoother viewing, the video should begin playing.
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