ios - 无法使用 MPMoviePlayerController 从视频中获取多个图像。操作系统状态 -12433

Question

我正在尝试使用 MPMoviePlayerController 从选定的视频文件中提取多个图像。下面是我写的代码。

movie = [[MPMoviePlayerController alloc] initWithContentURL:[info  objectForKey:UIImagePickerControllerMediaURL]];

NSNumber *time1 = [NSNumber numberWithInt:1];
NSNumber *time2 = [NSNumber numberWithInt:3];
NSNumber *time3 = [NSNumber numberWithInt:5];

NSArray *times = [NSArray arrayWithObjects:time1,time2,time3,nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleThumbnailImageRequestFinishNotification:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:movie];

[movie requestThumbnailImagesAtTimes:times timeOption:MPMovieTimeOptionExact];

这是通知的处理程序

  -(void)handleThumbnailImageRequestFinishNotification:(NSNotification*)note
  {
     NSDictionary *userinfo = [note userInfo];
     NSError* value = [userinfo objectForKey:MPMoviePlayerThumbnailErrorKey];

     if (value!=nil)
     {
       NSLog(@"Error: %@", [value debugDescription]);
     }
     else
     {
       _imageView.image = [userinfo valueForKey:MPMoviePlayerThumbnailImageKey];
     }
  }

但是我收到以下错误消息:

  Error: Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x1d8a63d0 {NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1d8b7b50 "The operation couldn’t be completed. (OSStatus error -12433.)", NSLocalizedFailureReason=An unknown error occurred (-12433)}

有人知道 OSStatus 错误 -12433 的描述吗？我尝试搜索有关 OSStatus 错误代码的文档，但没有成功。

如有任何帮助，我们将不胜感激。

Answer 1

我必须将时间添加为 float :

NSNumber *time1 = [NSNumber numberWithFloat:1.f];