* To AirPlay content from an iOS device to an Apple TV, these devices should be on the same network.
* In case of unsupported codec or subtitles, you have to use AirPlay Mirroring.
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Play H.264 video codec file.

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Tap the AirPlay icon on the bottom left of the playback screen.

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Select Apple TV.

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Enjoy your video with the Airplay device.
Airplay is also available while on sleep mode.