为什么视频在iPhone中的MPMoviePlayer上没有声音播放

Question

我正在使用MPMoviePlayer在我的应用中播放本地视频文件。文件是.mov格式化的。当我在模拟器中运行我的应用程序时它工作正常。但是，当我在iPhone视频中运行时没有声音。这是我的代码，

    self.currUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Gun_Shot" ofType:@"mov"]];
    if (self.mpc)
     {
       [self.mpc release];
       self.mpc = nil;
     }
    self.mpc =  [[MPMoviePlayerController alloc]
             initWithContentURL:self.currUrl];   
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:self.mpc];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackLoadStateDidChange:) name:MPMoviePlayerLoadStateDidChangeNotification object:self.mpc];   
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidEnterFullScreen:) name:MPMoviePlayerDidEnterFullscreenNotification object:self.mpc];    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidExitFullScreen:) name:MPMoviePlayerDidExitFullscreenNotification object:self.mpc]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackNowPlayingContinues:) name:MPMoviePlayerNowPlayingMovieDidChangeNotification object:self.mpc];  
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackStateChanged:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:self.mpc];

    self.mpc.controlStyle = MPMovieControlStyleNone;
    self.mpc.shouldAutoplay = NO;
    self.mpc.view.frame = CGRectMake(0, 0, self.mpView.frame.size.width, self.mpView.frame.size.height);
    [self.mpView addSubview:self.mpc.view];
    [self.mpView bringSubviewToFront:self.topMainView];
    [self.mpView bringSubviewToFront:self.bottomMainView];
    [self.mpc prepareToPlay];
    self.timeLbl.text = [NSString stringWithFormat:@"%f Sec(s)", self.mpc.duration];

我不明白为什么当应用程序在iPhone上运行时视频会静音。任何帮助将不胜感激..

Answer 1

不看你的代码。一个原因可能是您的iPhone处于静音模式。

此answer也可能对您有帮助。