Comment 12 for bug 1916301

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madbiologist (me-again) wrote :

Sorry, I was wrong about Firefox's built-in support for H.264 video. It is only used for WebRTC (a type of in-browser videoconferencing).

As Olivier said, installing libavcodec57 (or installing ffmpeg) will provide the H.264 decoding capability that you need to view this video and many others on YouTube and other sites.