I\'m have the problem that video doesn\'t work in Safari, but works perfectly fine with Chrome and Firefox.
This is indeed a bug* in Safari (at least 12.0.2), which doesn't accept to fetch this 300MB video as a single Request from the MediaElement.
They try desperately to make a Range request, but your host doesn't allow such requests. You can see it by trying to seek in the video while not fully loaded in other browsers.
You could workaround that issue by either
*Though I found this link which says that "HTTP servers hosting media files for iOS must support byte-range requests", so it is for iOS, but they probably have the same constraints for desktop. But that they do not support non-range requests sounds like a bug anyway as it goes against the specs.
If you haven’t solved the problem yet then go to your phone setting then choose safari and tap Clear History and Website Data, that worked for me the problem wasn’t the code but safari itself.
Another possible solution for you future searchers: (If your problem is not a mimetype issue.)
For some reason videos would not play on iPad unless i set the controls="true" flag.
Example: This worked for me on iPhone but not iPad.
<video loop autoplay width='100%' height='100%' src='//some_video.mp4' type='video/mp4'></video>