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I ran some tests and found that it's not the video that's causing the problem. I got the actual URL of the video file with JavaScript code (running in a Custom Button) and replaced the "src" attribute in the "iframe" tag that loads that video. By doing so, the video loaded on page. It seems that the problem only occurs when the video is loaded via the "https://player.glomex.com/..." website. The video in the second link that you posted loads without problems (in a "iframe" tag) via the website "https://platform.twitter.com/...".
I think 33.9.1 fixes this, by reverting certain recent changes. From your screenshots, it seems you are not in 33.9.1 yet.
I have to wait for the SSE2 build to be 100% sure. On my laptop with 33.9.1 the issue is gone. Well, the video plays at least but the controls are not visible.
Many thanks for your efforts, tellu-white.
I think 33.9.1 fixes this, by reverting certain recent changes. From your screenshots, it seems you are not in 33.9.1 yet.
You're welcome, back2themoon!
Yes, I did the previous tests on version 33.9.0.1 - I didn't know that version 33.9.1 has been released.
Now I've tested the page in version 33.9.1 (portable) and the video loaded without problems.