When opening a video, I am seeing the following error.

However, it only occurs on iPhone and Chrome emulator for iPhone.

I tested it on an Andriod smart phone and there was no error.

Same goes for selecting other devices in the screenshot above.

The HTML code for the video is

<iframe [src]="safeURL" allow="autoplay" frameborder="0"></iframe>

Could anyone give me some hints please?

Thanks in advance!