if( ! function_exists( 'videotube_disable_yt_autoplay' ) ){
    /**
     * Disable YT autoplay
     * @param html $html
     * @param string $url
     * @param args $args
     * @return html
     */
    function videotube_disable_yt_autoplay( $html, $url, $args ) {
        return str_replace( "?feature=oembed&autoplay=1", "?feature=oembed", $html );
    }
    add_filter( 'oembed_result', 'videotube_disable_yt_autoplay', 100, 3);
    add_filter( 'embed_oembed_html', 'videotube_disable_yt_autoplay', 100, 3 );
}