Mp4 video that cannot be heard

I don’t understand it, I’ve embedded a video with an mp3, it plays in the iMovie preview, in VLC, QuickTime, on Youtube. But I just add it to the web and it doesn’t play. Why is that?

Because browsers block autoplaying media that contains audio. So if you want to autoplay you need to give up audio. Or you can let the user click play, then audio can work.

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Txs Duncan, go to try !!!