I embed a twitter timeline like so:
<a class="twitter-timeline" href="https://twitter.com/Support">Tweets by Support</a> <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
You can see it at:
If you try to play a video in the timeline, then you get a black screen with text “The media could not be played.”. Some videos are played normally, others show error message.
Exactly this tweet is not playing in support timeline: https://twitter.com/TwitterSafety/status/846459111436824576
This is just an example, I encountered this problem when embedding another account timeline to my clients website.
Thanks for the help!