Marantz doesn’t play the video on Airplay ?
I have Marantz SR5014 and tried Airplay of AppleTV+ shows but I could only hear the audio but it isn’t playing the video through the connected projector.
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If you check your manual, then you’ll likely discover that your Marantz receiver supports AirPlay reception of audio sources (i.e. intended for music).
That is a different set of feature support than AirPlay of video sources, as provided by the Apple TV set-top box or AirPlay-enabled TVs.
AirPlay system requirements - Apple Support
Use AirPlay to stream audio - Apple Support
Use AirPlay to stream video or mirror your device’s screen - Apple Support
List of AirPlay 2-enabled receivers - Apple