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Question:

Question: Safari won't play youtube videos on my MacBook Pro anymore.

I keep getting this message: "macOS doesn't recognize internet addresses starting with 'rtsp:'"

I didn't have any problems with this yesterday. What can be done to fix this?

MacBook Pro, iOS 11.2.6

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Mar 17, 2018 9:11 AM in response to S1545 In response to S1545

Try setting up another admin user account to see if the same problem continues. Also try the Safe Mode.


Safe Mode - About El Capitan
also Sierra


Safe Mode Startup – El Capitan. also Sierra


If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Mar 17, 2018 9:11 AM

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Question: Safari won't play youtube videos on my MacBook Pro anymore.