<style>
.embed-container { 
  position: relative; 
  padding-bottom: 56.25%; /* 16:9 */
  /* padding-bottom: 75%; *//* 4:3 */
  height: 0; 
  overflow: hidden; 
  max-width: 100%; 
} 
.embed-container iframe, .embed-container object, .embed-container embed { 
  position: absolute; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%; 
}
</style>

<script src="https://www.rohstoff-tv.com/rtvplayer.js"></script>	
<div id="your_id"></div>
<script>
  rtv = new rtvPlayer('your_id',{
    videoId: 1919, //required [VIDEO_ID]
    width: 960,  //optional in px, default is 640
    height: 540, //not required see notes below but optional in px, default if no width is 360
    addClass: 'embed-responsive-item', //optional inserts a certain class, useful for responsive settings
    //optional options
    options: {
      autoplay: 1 //default is 0
    }
  });
</script>

https://www.rohstoff-tv.com/embed/watch&v=[VIDEO_ID]?[PARAMETER]