Published .mp4 videos not visible in Safari after update to 15.0

[StudioFerz]

I've published several eBooks from InDesign and after the Safari update to 15.0 (both desktop and mobile) videos (from file) aren't visible any more within the conatiner (it's empty). You can hear the audio though. Strange thing is that when going into full screen the video is visible again and when switching back to the container view, the video is visible again within the container. Is this a known bug after updating Safari to 15.0? I need a solution fast, as I have several client who expect this to work asap, specially on mobile and most don't have an alternative browser installed on their iPhone...

Example file:

https://indd.adobe.com/view/ce36f826-51ef-452b-a24c-85540b242506

[Derek Cross]

Presumably, the final output format is InDesign's Publish Online?

[StudioFerz]

Yes, that is correct.

[JonathanArias]

are you placing the video on indesign or are you hosting the video elsewhere? as in youtube or vimeo.

[StudioFerz]

I'm placing them in InDesign, which worked, untill the Safari update, perfectly.

[BobLevine]

If it's a Safari bug, and it sounds like one, there is nothing Adobe can do about it. Does it work in Chrome? Edge?

[StudioFerz]

It works fine in both Chrome and Edge.

[BobLevine]

Well, then. There you go.

I feel pretty safe saying this is a Safari thing. Can say whether it's a bug or a feature, though.