I want to play on my Sony Bravia TV a QuickTime movie from my 2012 15" MBP with Retina Display.
I activated AirPlay mirroring, and it played poorly - the video was a little hurky-jerky.
I took the video connector out of my Apple TV and plugged it into my MBP, and it played the video perfectly, but no sound.
How can I get picture and sound from the MBP onto the TV?
When you have it plugged in with HDMI, open System Prefences -> Sound and select your TV.
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