You are correct. I’ve reproduced the behavior over here. 
Have you tried replacing/re-uploading the video?
Edit: So we can better help diagnose and solve this challenge, can you try uploading a different sample video? http://www.sample-videos.com
You are correct. I’ve reproduced the behavior over here. Have you tried replacing/re-uploading the video?
Edit: So we can better help diagnose and solve this challenge, can you try uploading a different sample video? http://www.sample-videos.com