None of our videos are encoded with sound on Vimeo, however they don’t seem to autoplay in the Revolution Slider unless the user interacts with the element(s).
Perhaps a flag or param needs to be added to the embed code in order for it to function properly with this new autoplay policy?
I hope you are well today and thank you for your question.
Please try updating the theme on your site to the below latest version as described here https://support.shufflehound.com/updating-theme/ and make sure you are using latest version of Slider Revolution plugin.
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Also please refer the information provided in the following topic regarding this.