.htaccess to block direct access to videos

I want to stop people directly downloading a video from my site.
However, I want it still to be playable from within the HTML5 video player.

I thought I could do this with .htaccess to ensure the referer was from my site, so I did this:

RewriteEngine On
RewriteCond %{HTTP_REFERER} !^https://www\.mysite\.com [NC]
RewriteRule \.(m4v)$ - [F,NC,L]

Code (markup):

Why isnt this working?

 

check your apache logs and see what kind of referral you have from the video player
also RewriteCond %{HTTP_REFERER} !^https://www\.mysite\.com/.*$ [NC]