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[chowder66]

42. Here is what you can try

The article does go on to explain more details about each option.

How to Fix “Media File Could Not Be Played” Error

Each time you are encountered with ‘Media File Could Not Be Played’ error while playing a video, it’s mostly due to a browser issue.

Here are some easy solutions you can try to fix the error on your PC, Mac, or Android phone:

Reset your browser settings.
Update to the latest version of browser.
Delete cache, cookies and browser history.
Play the media file in incognito mode.
Turn off hardware acceleration.
Disable browser extensions.
Try the below workarounds that may fix the media loading error on PC, Mac, iPhone, and mobile phone:

Ensure good Internet speed on your system.
Try to play video in another browser.
Open only your source video website. Close all other browser windows.
If possible, watch videos in low quality. Click on video Settings > Quality. Select a lower quality (resolution or frame rate) view.

https://www.stellarinfo.com/blog/error-in-loading-media-file-could-not-be-played/


P.S. I had a similar problem as well and discovered it was Bitdefender. I had to make an exception for DU and Twitter in their settings.