曉霞提出的一個問題，uber播放視頻不打斷后臺MP3的播放，怎么實現
找了幾天原因發現原來是avplay播放session的切換問題。
一，聊天語音的錄音與播放
二，視頻播放
//播放視頻時先將音樂播放頻道切換到環繞音，不然播放視頻時會打斷聽音樂這里有個同時播放的demo https://github.com/MZimmerman6/FireplaceReceiver
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil
];
NSURL *movieURL = [NSURL fileURLWithPath
:
[[
NSBundle mainBundle] pathForResource:@"fireplace"
ofType:@"mp4"
]];
self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL
:movieURL];
[[
self.moviePlayer view] setFrame:CGRectMake(-221, -166, 1466, 1100
)];
[
self.view addSubview:self.moviePlayer.view
];
[
self.moviePlayer prepareToPlay
];
[
self.moviePlayer setScalingMode:MPMovieScalingModeAspectFill
];
[
self.moviePlayer setRepeatMode:MPMovieRepeatModeOne
];
[
self.moviePlayer setControlStyle:MPMovieControlStyleNone
];
[
self.moviePlayer play];
1，流媒體制作與播放
