When I display a video, I see this message: enter image description here

When I click through to the message about HTML support I see: enter image description here

Yet we know that Safari supports H.264.

Other notes - YouTube videos play in Chrome without trouble. Vimeo videos play in Safari no problem. This problem isn't version specific I've had it for eons. Disabling all extensions doesn't help.

OS version High Sierra 10.13.2 MacBook Pro - Early 2015 Graphics: Intel Iris Graphics 6100 1536 MB

  • Strange. I have an old iMac running High Sierra. I just went to YouTube and videos played fine. My computer is mid-2010 so I'd expect your graphics to be far better than mine. – jmh Jan 12 '18 at 18:05

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