Browser / Version: Firefox 81.0b1 + Firefox Nightly 82.0a1
Operating System: Windows 10
Tested Another Browser: Yes Other
Problem type: Video or audio doesn't play
Description: Media controls are broken or missing
Steps to Reproduce:
The Videos on Udemy work fine. The functionality (Pause and Play) doesn't work only when in Picture-in-Picture mode. The video must be restored to the normal display mode, and only then it can be paused or played. Brave browser isn't even able to launch the website's videos in P-in-P mode, so testing it on that browser doesn't tell me anything.
Browser Configuration
_From webcompat.com with 鉂わ笍_
Thanks for the report. For me while the video is in normal mode or in full screen, Pause/Play button is functional.
While video is in PiP mode, it can't be paused from that window. As a workaround it can be paused/resumed from the main screen.

Tested with:
Browser / Version: Firefox Nightly 82.0a1 (2020-08-25)
Operating System: Windows 10 Pro
I don't think this is the right place for thing type of issues, but moving to Needsdiagnosis for further investigation.
According to Gijs in comment 1 this is most likely an issue on udemy side. Lets contact udemy to see if they will be willing to fix it.
Same problem here, I would be greatly appreciated if Udemy team can fix this issue.
Looks like @udemy is on github. Maybe @sungjuly or @kudos could help us with this issue. Hi Sungju and Jonathan, we're wondering if you're able to pass this along to the relevant person or team? There is a bit of investigation in this comment https://bugzilla.mozilla.org/show_bug.cgi?id=1656869#c1 if that helps with identifying the root cause
@ksy36 I'll let the right people know, thanks.
Most helpful comment
@ksy36 I'll let the right people know, thanks.