UserAgent: Mozilla/5.0 (X11; CrOS x86_64 8481.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2773.0 Safari/537.36

Example URL:
https://jsfiddle.net/xfpocL36/

Steps to reproduce the problem:
1. Visit https://jsfiddle.net/xfpocL36/

<video autoplay loop muted preload>
	<source src="https://i.imgur.com/iFzx1dC.webm" type="video/webm">
	<source src="https://i.imgur.com/iFzx1dC.mp4" type="video/mp4">
</video>

What is the expected behavior?
The video should be playing.

What went wrong?
Instead of video there's just a white box.

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? N/A 

Chrome version: 53.0.2773.0  Channel: dev
OS Version: 8481.0.0
Flash Version: Shockwave Flash 22.0 r0

This is affecting Reddit mp4 previews and Telegram GIFs, both show up as white boxes instead of the animated image.