Broken video embeds

[ARB]

Vimeo embed:

Vimeo link:
Dreams

Okay, so after posting that, I'm even more confused.
Apparently none of the embeds work, while normal links to Vimeos are turned into working (httpS) embeds.  (This doesn't work for YouTube; I've tried.)

Code:

Vimeo embed:<br />
<!-- start: video_vimeo_embed --><br />
<iframe src="http://player.vimeo.com/video/120105021" width="500" height="281" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe><br />
<!-- end: video_vimeo_embed --><br />
Vimeo link:<br />
<iframe src="https://player.vimeo.com/video/120105021" width="500" height="300" frameborder="0"></iframe><br />

Oh, and do you think turning off videos would really just set the iframes to HTTP?  When I add an S (in the developer tools) they work perfectly.  That seems like an odd way to try to get rid of them.  Also, in desktop Chrome, there's a shield with an x in the address bar on pages with embeds.  When clicked, it says "This page is trying to load scripts from unauthenticated sources" along with a "load unsafe scripts" button.  When THAT'S clicked, it reloads (with https in the address bar crossed out in red) and they work.

Developer tools on this thread:


Sidenote: They all show up in Tapatalk; that doesn't count.

Double sidenote: when manually changing the URL to http:// in the address bar, everything loads, as there is no mixed content.