Technik » Problem playing HTML5 videos

I have a problem playing Html5 videos in Google Chrome and also in EDGE, it also happens once in a while in YouTube also. Sometimes they open and play perfectly but other times they show a blackish screen with the message:

‘Your browser does not currently recognize any of the video formats available'
Click here to visit our frequently asked questions about HTML5 video’

I have clicked on the message but not sure what to do.
How do I resolve this problem?



Please help....


I didn't find the right solution from the Internet.
References
https://www.windows10forums.com/threads/...5-videos.15293/
product advertising examples