Question

我正在构建一个使用AVFoundation捕获视频的iOS视频应用程序。启动应用程序时，我创建一个AVCaptureSession，当用户按下“录制”按钮时，视频将被捕获并以“temp.MOV”名称写入Documents文件夹。这对我的AVAssetExporter来说没有问题，它可以合并和重新格式化我的构图。

但是，如果我尝试使用UIImagePicker中的Video，AVAssetExporter会因错误而停止。

Export failed: Operation Stopped
Export failed: Error Domain=AVFoundationErrorDomain Code=-11841 "Operation Stopped" UserInfo=0x17db5100 {NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The video could not be composed.}

我想知道是否需要使用UIImagePicker的视频做一些特别的事情。

//从AVCaptureSession写的文件

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{

NSLog(@"didFinishRecordingToOutputFileAtURL %@", outputFileURL); 
//DOCUMENTS/temp.mov
self.movieFileURLForExport = outputFileURL; 

}

UIImagePickerController视频导入代码

- (IBAction)iba_importVideo:(id)sender{

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.mediaTypes = [[NSArray alloc]
                     initWithObjects: (NSString *) kUTTypeMovie, nil];
picker.delegate = self;
picker.allowsEditing = YES;
picker.videoQuality = UIImagePickerControllerQualityTypeHigh;
[self presentViewController:picker animated:YES completion:nil];

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSString *type = [info objectForKey:UIImagePickerControllerMediaType];

if ([type isEqualToString:(NSString *)kUTTypeVideo] ||
    [type isEqualToString:(NSString *)kUTTypeMovie]) {


    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSLog(@"PickedVideoURL %@", [videoURL absoluteString]);

    NSData *videoData = [NSData dataWithContentsOfURL:videoURL];

    NSString *dataPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/films"];
    NSString *moviepath = [dataPath stringByAppendingString:@"/temp.mov"];

    BOOL success = [videoData writeToFile:moviepath atomically:YES];
    NSLog(@"Write Successs: %@", success ? @"YES" : @"NO");

    [self checkDIRECTORYContents];
    self.view.userInteractionEnabled = NO;

   self.movieFileURLForExport = [NSURL fileURLWithPath:moviepath]; 

    [picker  dismissViewControllerAnimated:YES completion:nil];


}

}

Answer 1

我找到了解决方案。以前当我创建我的AVAssetExporter时，我正在使用

AVAssetURL

为已挑选的视频加载我的NSURL。

我把它改成了

 AVAsset *videoasset = [AVAsset assetWithURL:videoURL];

并解决了这个问题。

我不知道为什么这会纠正UIImagePicker挑选的视频，而不是通过AVfoundation拍摄并保存到某个位置的视频。但纠正了我的问题。

AVAssetExporter和UIImagePickerViewController视频

1 个答案: