Safari seems to have problems with video playback.
When I play two Youtube videos simultaneously the second one fast forwards to the end.
There are also other glitches that I couldn't capture, because they happen randomly, where the video flashes green or has other artefacts flashing.
Doesn't happen in Chrome, Firefox or while playing videos with QuickTime.
MacBook Pro 15", macOS 10.14
Here are a few fundamental troubleshooting steps that may help. Much of the information will be redundant but review everything to determine if there is something you may have overlooked.
If you don't get anywhere, you can use the following procedure to determine if the problem is internal or external to your Mac. Causes may involve your router, your ISP, the DNS Server(s) it uses, or certain user-configurable options.
Determine if the problem persists while using Safari in that mode. After that, restart your Mac normally, and reply with your observations
Here are a few fundamental troubleshooting steps that may help. Much of the information will be redundant but review everything to determine if there is something you may have overlooked.
If you don't get anywhere, you can use the following procedure to determine if the problem is internal or external to your Mac. Causes may involve your router, your ISP, the DNS Server(s) it uses, or certain user-configurable options.
Determine if the problem persists while using Safari in that mode. After that, restart your Mac normally, and reply with your observations
Thanks for the reply, but nothing helped.
A restart usually fixes the issue for about a day, but then it reoccurs.
Also just noticed that Youtube videos get fast forwarded when VLC player is playing a video or even pausing on a video.
Chrome won't even play videos then.
Firefox works fine.
Safari video glitches
