Writer: can't insert MP4 video


I want to insert a MP4 video (downloaded from youtube) in a LibreOffice Writer file.
I go to “insert” → “media” → “audio or video” and select my MP4 video file.

Writer gives error message “Format not supported”.
I tried several videos but they all got this same error message.
The video itself plays fine using any video player.

I have Windows 10 and I use LibreOffice (x64).

What can I do to insert a MP4 video?

Thank you

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