Iphone 无法使用MPMoviePlayerViewController播放视频

我用下面的ViewController.m创建了一个新项目。当我运行应用程序时，我可以看到一个预期来源/大小的框（38100250163），但它是黑色的，没有视频播放。Xcode中有一个奇怪的输出：

2012-08-23 15:36:45.559 VideoTest1[11398:c07] [MPAVController] Autoplay: Disabling autoplay for pause
2012-08-23 15:36:45.560 VideoTest1[11398:c07] [MPAVController] Autoplay: Disabling autoplay
2012-08-23 15:37:18.186 VideoTest1[11398:c07] [MPAVController] Autoplay: Skipping autoplay, disabled (for current item: 1, on player: 0)

请注意，视频是用Videora iPhone Converter转换的，在Xcode中播放正常（因此这不是视频问题）；视频的路径是正常的，因为当我指定demo-iPhone1（它不存在）时，我得到一个nil异常。我在模拟器和iPhone上试过：总是黑匣子。有什么想法吗

#import "ViewController.h"
#import <MediaPlayer/MediaPlayer.h>  

@interface ViewController ()

@end

@implementation ViewController
- (void)moviePlaybackComplete:(NSNotification *)notification
{
    MPMoviePlayerController *moviePlayerController = [notification object];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:MPMoviePlayerPlaybackDidFinishNotification
                                                  object:moviePlayerController];

    [moviePlayerController.view removeFromSuperview];
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *filepath   =   [[NSBundle mainBundle] pathForResource:@"demo-iPhone" ofType:@"mp4"];
    NSURL    *fileURL    =   [NSURL fileURLWithPath:filepath];
    MPMoviePlayerController *moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlaybackComplete:)
                                                 name:MPMoviePlayerPlaybackDidFinishNotification
                                               object:moviePlayerController];
    [moviePlayerController.view setFrame:CGRectMake(38,
                                                    100,
                                                    250,
                                                    163)];
    [self.view addSubview:moviePlayerController.view];
    [moviePlayerController play];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

#导入“ViewController.h”
#进口
@界面视图控制器（）
@结束
@实现视图控制器
-（作废）电影回放完成：（NSNotification*）通知
{
MPMoviePlayerController*moviePlayerController=[通知对象]；
[[NSNotificationCenter defaultCenter]移除观察者：self
名称：MPMoviePlayerPlaybackDidFinishNotification
对象：moviePlayerController]；
[moviePlayerController.view从SuperView移除]；
}
-（无效）viewDidLoad
{
[超级视图下载]；
//加载视图后，通常从nib执行任何其他设置。
NSString*文件路径=[[NSBundle mainBundle]路径资源：@“mp4”类型的“演示iPhone”；
NSURL*fileURL=[NSURL fileURLWithPath:filepath]；
MPMoviePlayerController*moviePlayerController=[[MPMoviePlayerController alloc]initWithContentURL:fileURL]；
[[NSNotificationCenter defaultCenter]添加观察者：self
选择器：@selector（moviePlaybackComplete:）
名称：MPMoviePlayerPlaybackDidFinishNotification
对象：moviePlayerController]；
[moviePlayerController.view设置帧：CGRectMake（38，
100,
250,
163)];
[self.view addSubview:moviePlayerController.view]；
[moviePlayerController播放]；
}
-（无效）未收到记忆警告
{
[超级记忆警告]；
}
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation
{
返回（interfaceOrientation！=UIInterfaceOrientation肖像向上向下）；
}
@结束

我通过添加

playercontroller.moviePlayer.movieSourceType=MPMovieSourceTypeFile解决了类似的问题
是否使用ARC？如果是这样，您必须保留MPMoviePlayerController

将此添加到您的界面

@property (nonatomic, strong) MPMoviePlayerController *controller;

检查viewDidLoad的最后一行

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *filepath   =   [[NSBundle mainBundle] pathForResource:@"demo-iPhone" ofType:@"mp4"];
    NSURL    *fileURL    =   [NSURL fileURLWithPath:filepath];
    MPMoviePlayerController *moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlaybackComplete:)
                                           name:MPMoviePlayerPlaybackDidFinishNotification
                                           object:moviePlayerController];
    [moviePlayerController.view setFrame:CGRectMake(38,
                                                100,
                                                250,
                                                163)];
    [self.view addSubview:moviePlayerController.view];
    [moviePlayerController play];
    [self setController:moviePlayerController];
}

我刚刚用这行代码解决了一个类似的问题。现在，播放器控制器将显示，视频将完美播放：

@property (nonatomic, strong) MPMoviePlayerController *moviePlayer;
//
@synthesize moviePlayer = _moviePlayer;
//
[self.moviePlayer prepareToPlay];

修改以适应您的环境。
还可以查看视频格式。我的示例视频
.m4v
（我从苹果网站下载）一直出现这个错误。最后，我尝试了另一个视频剪辑
.mp4
，效果很好。许多错误仍然出现在我的控制台上

2013-01-22 15:44:04.850 VideoTesting[4497:c07] [MPAVController] Autoplay: Likely to keep up or full buffer: 0
2013-01-22 15:44:04.851 VideoTesting[4497:c07] [MPAVController] Autoplay: Skipping autoplay, not enough buffered to keep up.
2013-01-22 15:44:04.853 VideoTesting[4497:c07] [MPAVController] Autoplay: Disabling autoplay for pause
2013-01-22 15:44:04.853 VideoTesting[4497:c07] [MPAVController] Autoplay: Disabling autoplay
2013-01-22 15:44:04.861 VideoTesting[4497:c07] [MPAVController] Autoplay: Enabling autoplay

但视频仍在播放
 你试过其他的视频吗。也许是从vimeo下载的mp4？史蒂夫，视频真的很好，因为它在我的另一个应用程序中播放，代码完全相同。但仍然无法找出区别。顺便说一句，我添加了Xcode输出。也许这会让你知道问题出在哪里。在iPad/iOS6上调用“prepareToPlay”为我解决了这个问题。没有它，“MPMoviePlayerLoadStateDidChangeNotification”不会被发送，因为播放机不需要预先加载视频。在我在iOS6上出现黑屏之前（在iOS5及以下版本上工作正常）也为我修复了它。这也修复了我的问题，但是，当在5秒内从splitView加载另一个视频时，我仍然可以听到上一个视频的音频，直到5秒结束…有人有这个问题吗？我正在考虑添加AVFoundation框架，以便我可以尝试控制音频会话？+1用于保留。太多教程显示了临时变量的用法。