Responses can only be as useful as the details provided. It might help to start with where are you seeing this "other audio content" message. I am not sure if movie audio is able to be sent over AirPlay. That is generally just for music. It is even less likely that Apple would be allowed to do that given that the content you are talking about is all DRM restricted. I doubt the copyright holders would allow the audio to be trasmitted like that.
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