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I tried to reproduce your error but it works all fine. I downloaden a video and images from pixabay and loaded bootstrap 4 through cdn links. Instead of inline css I use the bootstrap classimg-fluid to make the media fit better in the carousel, I disabled the indicators in my example.
Below the code I tested:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-12">
<div id="demo" class="carousel slide" data-ride="carousel">
<!-- Indicators -->
<!-- <ul class="carousel-indicators">-->
<!-- <li data-target="#demo" data-slide-to="0" class="active"></li>-->
<!-- <li data-target="#demo" data-slide-to="1"></li>-->
<!-- <li data-target="#demo" data-slide-to="2"></li>-->
<!-- </ul>-->
<!-- The slideshow -->
<div class="carousel-inner">
<div class="carousel-inner">
<div class='carousel-item active'>
<video src='media/Golden - 48569.mp4' loop autoplay muted playsinline class="img-fluid">
</div>
<div class='carousel-item'>
<img src='media/20201102_14%20-%20Foto.jpg' alt='' class="img-fluid">
</div>
<div class='carousel-item'>
<img src='media/20201102_17%20-%20Fotoe.jpg' alt='' class="img-fluid">
</div>
</div>
</div>
<!-- Left and right controls -->
<a class="carousel-control-prev" href="#demo" data-slide="prev">
<span class="carousel-control-prev-icon"></span>
</a>
<a class="carousel-control-next" href="#demo" data-slide="next">
<span class="carousel-control-next-icon"></span>
</a>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</body>
</html>
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