Even though we add the autoplay parameter to the end of the video URL automatically with WP Video Popup & WP Video Popup PRO, most browsers ignore it.
A lot of browsers have changed their autoplay policy and don’t play videos autmatically, even with the parameter – provided by YouTube/Vimeo – assigned.
One workaround would be to mute the video by adding the
mute="1" parameter to the shortcode.It’s still not guaranteed that this works with all browsers.
Unfortunately, there’s not much we can do on our end to avoid this.