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For more information on this, take a look at this article:
To stream music or videos from your computer to an Apple TV or AirPort Express:
- Connect your computer and Apple TV to the same Wi-Fi network.
- Open iTunes (10.2 or later).
- Locate and click the icon in the bottom-right corner of the iTunes application.
- Select your Apple TV, AirPort Express, or AirPlay-enabled speakers or receivers from the list of available devices that appears, and begin playback.
For troubleshooting on this, take a look at this article:
Troubleshooting AirPlay and AirPlay Mirroring
Best of luck,
I have the same problem, I am streaming from my MacBook Air 2012 using Chrome and YouTube to my Apple TV V3 and I get the video fine, but there is no Audio, randomly after playing around a little bit I will get Audio but most of the time, there will be just silence. I tried rebooting the ATV and MBA but nothing, what's the soluciton when I am doing AirPlay Mirroring and not using iTunes for the NO AUDIO problem, thanks
My cousin came around and together we conquered the Apple TV! The initial reason for it not working was I hadn't reset my laptop after the initial installation of the Apple TV.
However, it stuffed up again. This time I found that if I closed the program I was using (VLC player) then opening it again while my laptop was connected to the Apple TV the audio worked.
Simple solution to what I assumed was a complex problem :)