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Playing mp4 file through html not working

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I've ben trying to play a video that i uploaded onto a website I'm creating but it's not working and my media.mp4.enabled has been set to true as well

I've ben trying to play a video that i uploaded onto a website I'm creating but it's not working and my media.mp4.enabled has been set to true as well

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What html code are you using ? Does this work in other browsers ?

Did you check the Web Console for possible error messages ?