UIImagepickercontroller:转换为低质量的视频错误 [英] UIImagepickercontroller: converting to low quality video error

问题描述

我正在从UIImagepickercontroller的didFinishPickingMediaWithInfo方法获取输入URL [info objectForKey:UIImagePickerControllerMediaURL].

I am getting inputurl [info objectForKey:UIImagePickerControllerMediaURL] from UIImagepickercontroller's didFinishPickingMediaWithInfo's method.

NSURL *inputURL = [NSURL URLWithString:inputurlstring];

我要从此代码中提供outputurl

I am giving outputurl from this code

        NSString  *documentsDirectory = [paths objectAtIndex:0];
        NSString *videoPath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"capturedvideo.MOV"];
        NSURL *outputURL = [NSURL fileURLWithPath:videoPath];

我使用以下代码来获取低质量的视频

I used the following code to get low quality video

 - (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL 
    outputURL:(NSURL*)outputURL 
    handler:(void (^)(AVAssetExportSession*))handler 
    { 

    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil]; 
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil]; 
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality]; 
    exportSession.outputURL = outputURL; 
    exportSession.outputFileType = AVFileTypeQuickTimeMovie; 

    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) 
    { 
    if (exportSession.status == AVAssetExportSessionStatusCompleted) 
    { 
    printf("completed\n"); 

    } 
    else 
    { 
    printf("error\n"); 
    NSLog(@"error is %@",exportSession.error); 

    } 

    }]; 
}           

仅使用大文件时出现以下错误.因为当我使用小尺寸的视频文件时，我没有得到任何错误.

I am getting following error when I use large files only. Because when I use small size video file I did not get any error.

Error Domain=NSURLErrorDomain Code=-1 "unknown error" UserInfo=0x616d890         
 {NSErrorFailingURLStringKey=/private/var/mobile/Applications/EE1E6701-EED0-4830-BD1D-7366680713C0/tmp//trim.7mL7VS.MOV, NSErrorFailingURLKey=/private/var/mobile/Applications/EE1E6701-EED0-4830-BD1D-7366680713C0/tmp//trim.7mL7VS.MOV, NSLocalizedDescription=unknown error, NSUnderlyingError=0x2d1460 "The operation couldn’t be completed. (OSStatus error -12935.)", NSURL=/private/var/mobile/Applications/EE1E6701-EED0-4830-BD1D-7366680713C0/tmp//trim.7mL7VS.MOV}

推荐答案

上面的代码是完美的作品.唯一的变化是inputURL.

the above code is perfectly works. the only change is inputURL.

在将inputURL更改为fileURLWithPath之后:

after I changed the inputURL to fileURLWithPath:

 NSURL *inputURL = [NSURL fileURLWithPath:inputurlstring];

现在它可以完美工作了.

Now its perfectly works.

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