試圖從相機膠捲播放電影時出現黑屏

我在這裏和網上查看了十幾個不同的帖子。仍然無法弄清楚。我可以在本地播放支持文件的電影，但當我嘗試播放從相機卷拾取的電影時，我會看到黑屏。所以我相信問題在於從uipicker獲取網址並播放它。試圖從相機膠捲播放電影時出現黑屏

我想我的問題就出在這裏playMovie-

 
NSURL *videoURL = [NSURL URLWithString:@"public.movie"]; 
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL: videoURL];

這不是給我正確的URL，從選擇器播放電影的前兩行。我也試圖把 '網址'，而不是@ 「public.movie」

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 
@synthesize player; 

-(IBAction) selectMovie 
{ 

    UIImagePickerController *picker = 
    [[UIImagePickerController alloc] init]; 
    picker.delegate = self; 
    picker.sourceType = 
    UIImagePickerControllerSourceTypePhotoLibrary; 


    picker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil]; 

    [self presentModalViewController:picker animated:YES]; 
} 

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 

    //NSString *mediaType = [info valueForKey:UIImagePickerControllerMediaType]; 
    //[mediaType isEqualToString:@"public.movie"]; 
    //{ 
     NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];//used to be*videoURL 
    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL]; 


    [picker dismissModalViewControllerAnimated:YES]; 
    //[picker release]; 

} 

-(IBAction)playMovie 
{ 

    NSURL *videoURL = [NSURL URLWithString:@"public.movie"]; 
    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL: videoURL]; 
    [moviePlayer prepareToPlay]; 
    moviePlayer.view.frame = CGRectMake(100, 100, 200, 200); 
[self.view addSubview:moviePlayer.view]; 
    moviePlayer.shouldAutoplay = NO; 
    moviePlayer.view.backgroundColor = [UIColor grayColor]; 

[moviePlayer play]; 

    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(moviePlayBackDidFinish:) 
               name:MPMoviePlayerPlaybackDidFinishNotification 
               object:moviePlayer]; 
    //[player release]; 

} 

-(void) moviePlayBackDidFinish:(NSNotification*)notification 
{ 
    MPMoviePlayerController *moviePlayer = [notification object]; 

    [[NSNotificationCenter defaultCenter] removeObserver:self 
                name:MPMoviePlayerPlaybackDidFinishNotification 
                object:moviePlayer]; 
    [self dismissModalViewControllerAnimated:YES]; 
    //[player autorelease]; 
    //[player release]; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
} 

- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    [moviePlayer release]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:animated]; 
} 

- (void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 
} 

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [super viewWillDisappear:animated]; 
} 

- (void)viewDidDisappear:(BOOL)animated 
{ 
    [super viewDidDisappear:animated]; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { 
     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
    } else { 
     return YES; 
    } 
} 


@end

來源

2013-01-09 user908462

的問題是在這裏

NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];

試試這個的：

videoURL = (NSURL*)[info objectForKey:@"UIImagePickerControllerMediaURL"];

，當你播放視頻，而不是這

NSURL *videoURL = [NSURL URLWithString:@"public.movie"]; 
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL: videoURL];

moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];

和movieplayer應該是一個屬性。希望它有幫助。

來源

2013-07-31 10:14:26

試圖從相機膠捲播放電影時出現黑屏

回答

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