Streaming Video From a MacBook With AirPlay

Connect your Apple TV to a television with an HDMI cable for the highest-quality sound and video. If your TV doesn't have an available HDMI port, use a three-component video cable and two-component audio cable. Connect your Apple TV's left and right audio ports to your TV's corresponding inputs and match your Apple TV's green, blue and red video ports to your TV's Y, Pb and Pr ports, respectively.
Connect your Apple TV to the Internet by turning it on and following the on-screen prompts. Use your Apple TV Remote's Up and Down buttons to select a network from the list and press the middle button to join the network. Use the on-screen keyboard to enter your password if your network is encrypted. After joining your network, your TV displays a five-digit passcode for pairing with iTunes.
Pair your Apple TV with iTunes by entering the passcode in iTunes on your MacBook. Launch iTunes and press “Command-S” to show the sidebar. Select “Apple TV” in the Devices section and enter the passcode when prompted.
Enable AirPlay in iTunes by clicking the “AirPlay” icon in the status bar and selecting “Apple TV” from the drop-down list. On your television, browse your iTunes video collection by selecting “Computer” and choosing a title with the Apple Remote's left or right button. Press the middle button to Play.
Turn on AirPlay Mirroring to display your MacBook's video output on your television. This feature works separately from AirPlay streaming in iTunes, so close iTunes before enabling AirPlay Mirroring. Click the “AirPlay” icon on your Mac's status bar and select “Apple TV” from the drop-down list. In the Match Desktop Size menu, choose “Apple TV” to convert your MacBook's resolution to widescreen dimensions that match your television. After a moment, your Mac desktop appears on your TV screen.
Stream Web video to your television by opening a Web browser on your Mac and visiting a streaming video site, such as Hulu, Dailymotion or Vimeo (see Resources for links). Watch a video on your television by starting playback from your MacBook and clicking “Fullscreen.”
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How to Improve the Wi

Click the 'AirPort' icon and select 'Turn Wi-Fi Off.' Wait five to 10 seconds, then select 'Turn Wi-Fi On' to reset your wireless adapter. If you leave the MacBook Air's Wi-Fi adapter on for several hours or even days, it becomes overloaded with information and may need to be restarted.
Select the name of an encrypted wireless network with a password you know from the 'AirPort' menu. Although connecting to an unencrypted network requires less effort since you don't need to input a password, using unencrypted networks places you at greater risk for a slow connection due to an excessive number of users.
Connect to a different network if the one you usually use is slow or completely inactive. If another network works on your MacBook Air, even if you don't plan to use it regularly, it shows that the problem is with the connection and not the MacBook Air.
Sit as close as possible to the router for the wireless connection you use. The less distance the signal has to travel, the higher quality it is. This optimizes the speed and consistency of the Internet on the MacBook Air.
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