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No compatible source was found for this media

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Hello,I can't seem to play any mp4/html5 video on firefox,I can play youtube/vimeo videos finely but when open my google drive or any other website to play some video I keep getting "No compatible source was found for this media" on other media streaming websites and on google drive I get this error "This video format is not supported".So could someone help me out?

Hello,I can't seem to play any mp4/html5 video on firefox,I can play youtube/vimeo videos finely but when open my google drive or any other website to play some video I keep getting "No compatible source was found for this media" on other media streaming websites and on google drive I get this error "This video format is not supported".So could someone help me out?