<video> plays in other browsers, but not Safari

Question

We have an MP4 video on our site; it plays fine in IE9+, Firefox, Chrome, and Chrome on mac. However, on Safari, the video doesn\'t play at all - it does trigger a \"stalled

Answer 1

I uploaded a new MP4 file, but it played in SAFARI only (on both my MAC and my iPhone), not Chrome, Oasis, Firefox, or Brave. HTML code was identical to previous successes. File size and Dimensions were fine. But the Codecs on the old, working files were "H.264, AAC". The Codecs on the new, not working files were "MPEG-4, AAC". I edit my video files on VideoPad. So I looked at the specification selections on the "Export file as" options, and, sure enough, the Codecs was defaulted to MPEG-4. I selected H.264 and exported the file. Uploaded to AWS and made public. Retried my new files in the four failure browsers and BINGO!, they all worked. There is a God!