Firefox not playing videos on Ubuntu 20.04.4 LTS

My newly deployed Ubuntu 20.04.4 LTS has already installed Firefox 80, but most videos in the web are not playable. One codec complains "No video formats available", while the other, for example, youtube, says that my browser can't play HTML5 videos.

What I've tried and this solution worked with me.

hey this is Kartik, a 17 year old independent tech enthusiast. i posted this blog at MSM to help people like you and if this solution work with you please do like share and comment to motivate me.

 Bro, a solution for your problem takes no more than one line :)

sudo apt install ffmpeg

That's all! After restarting your firefox browser the changes are applied and the browser plays any video content you wish.

P.S. I lost 2 annoying days searching the web for solution, trying different approaches, rolling back changes, reinstalling browser and so on, and try to imagine my face when this single line appeared the solution.

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