On Facebook, some videos are with HD enabled automatically by default, while others are not. I uploaded some videos, and would like that my viewers see it with HD turned on by default.  

I want my facebook videos playing in HD without requesting the user to change his video settings.

Facebook seems to play my videos in SD. Why does it happen? How to configure it to HD? What is the secret? Is there any option/payment to enable it by default?

1) For example, [this video](https://www.facebook.com/video.php?v=10151554502361159) is HD but only plays in HD if user clicks on HD button.  

2) But on [this video](https://www.facebook.com/video.php?v=10152663952345769) it plays by default on HD without user need to click on HD button.

My video playing settings are facebook default setting. My download speed is about 14 Mbps.

I would like to enable this HD by default, without the user change his video settings.
I want my video playing in HD as the video on that second [link](https://www.facebook.com/video.php?v=10152663952345769).