ipad - iOS5:MPMoviePlayerController 仅视频，无音频

Question

这不是没有视频，只有音频的问题。这只是 对面 .
使用iOS 5.0时出现问题。运行 4.3 或更低版本的 iPad 可以完美播放相同的视频文件。

由于 iOS 5 改变了为 MPMoviePlayerControllers 初始化东西的方式，我必须做一些基于 SDK 的编程才能显示视频。在实现我接下来展示的代码片段之前，视频及其控件甚至不会显示在屏幕上。 Controller 将只显示一个黑色方块，其大小和原点为给定的 CGRect 框架。

我的处理方式如下:

视频文件位于文档文件夹中。所以NSURL 必须被初始化为fileURLWithPath。完成后，我继续使用给定的帧初始化 Controller 。由于它不会以其他方式工作，因此 View 只会在更改其 loadState 后添加播放器。这是通过订阅通知来实现的。订阅者选择器将 Controller 的 View 添加到父 View 在主线程 因为可以从其他线程处理通知。

初始化视频并将其添加到 View 中:

-(void)addVideo:(NSString*) videoName onRect:(CGRect)rect {

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    iPadMagazineAppDelegate *appDelegate = GET_APP_DELEGATE;
    NSArray *dirArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *dirName = [dirArray objectAtIndex:0];

    // get directory name for this issue
    NSURL *baseURL; 

    /* 
     BUGFIX: Video does not work on iOS 5.0

     */
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0")){
        baseURL = [[NSURL fileURLWithPath:dirName]URLByAppendingPathComponent:[appDelegate.currentIssue getIssueDirectoryName ]];
    }else {
        baseURL = [[NSURL URLWithString:dirName] URLByAppendingPathComponent:[appDelegate.currentIssue getIssueDirectoryName]];
    }

    /* end  BUGFIX: Video does not work on iOS 5.0 */

    NSURL *videoURL = [baseURL URLByAppendingPathComponent:videoName];    


    MPMoviePlayerController * movieController= [[MPMoviePlayerController alloc]initWithContentURL:videoURL];

    // set frame for player
    movieController.view.frame = rect;

    // set  auto resizing masks
    [movieController.view setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];

    // don't auto play.
    [movieController setShouldAutoplay:NO];

    [movieController setUseApplicationAudioSession:YES];

    /*
     BUGFIX: Video does not work on iOS 5.0
     */
    if (SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(@"5.0")) {
        [movieController prepareToPlay];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadVideo:) name:MPMoviePlayerLoadStateDidChangeNotification object:movieController];  
    }else {
        [pdfView addSubview:movieController.view];
        [pdfView bringSubviewToFront: movieController.view];
    }

    /* end  BUGFIX: Video does not work on iOS 5.0 */

    [_moviePlayerViewControllerArray addObject:movieController];
    [movieController release];
    [pool release];
}

通知处理程序:

-(void)loadVideo:(NSNotification*)notification {

    for (MPMoviePlayerController *movieController in _moviePlayerViewControllerArray) {

        if (movieController.loadState != MPMovieLoadStateUnknown) {


            [pdfView performSelectorOnMainThread:@selector(addSubview:) withObject:movieController.view waitUntilDone:YES];
            [pdfView performSelectorOnMainThread:@selector(bringSubviewToFront:) withObject:movieController.view waitUntilDone:YES];
            [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerLoadStateDidChangeNotification object:movieController];
        }
    }

}

感谢您阅读这个巨大的问题。我很欣赏你的回答。

干杯。

Answer 1

尝试这个:
将 MPMoviePlayerController 的属性“useApplicationAudioSession”设置为“NO”。