Vimeo API .play() only triggers audio inside of slider - vimeo

Question

Using Swiper.js along side the Vimeo API. Have a custom thumbnail overlayed on the Vimeo embed with some JS to trigger the .play() method. This works fine outside of the slider, but if the video is embedded in a slide, it only plays the audio. The video appears but it's stopped, and can be played like normal.
My JS:
$(document).ready(function(){
var swiper = new Swiper(".swiper", {
slidesPerView: 3,
spaceBetween: 100,
centeredSlides: true,
loop: true,
pagination: {
el: ".swiper-pagination",
clickable: true,
},
navigation: {
nextEl: ".swiper-button-next",
prevEl: ".swiper-button-prev",
},
on: {
slideChange: function () {
$('.swiper-video').each(function(){
var iframe = $(this).data('player');
var player = new Vimeo.Player($('#'+iframe));
$(this).children( '.vidthumbnail' ).show();
player.pause();
});
}
}
});
$('.vidplay_btn').each(function(){
$(this).click(function(){
var video = $(this).data('video');
var iframe = $(this).data('player');
var player = new Vimeo.Player($('#'+iframe));
$( '.vidthumbnail' ).show();
$( '#'+video+' .vidthumbnail' ).hide();
player.play();
});
});
});