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 Error -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。
任何帮助将不胜感激。