如何获得视频PHAsset磁盘文件大小？

Question

我试图确定PHAsset视频磁盘上的文件大小。

以下代码返回错误“无法打开文件”IMG_0188.mov“，因为您无权查看它。”

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init]; 
      options.version = PHVideoRequestOptionsVersionOriginal; 

      [[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset *avAsset, AVAudioMix *audioMix, NSDictionary *info) { 
       videoURL = [(AVURLAsset*)avAsset URL]; 

       NSNumber *videoDiskFileSize; 
       NSError *error; 
       [videoURL getResourceValue:&videoDiskFileSize forKey:NSURLFileSizeKey error:&error]; 

       if(error){ 
        NSLog(@"ERROR %@", error.localizedDescription); 
       } 

       NSLog(@"size is %f",[videoDiskFileSize floatValue]/(1024.0*1024.0)); 
      }]; 

Answer 1

下面是正确的方法。

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init]; 
      options.version = PHVideoRequestOptionsVersionOriginal; 

      [[PHImageManager defaultManager] requestExportSessionForVideo:asset options:options exportPreset:AVAssetExportPresetHighestQuality resultHandler:^(AVAssetExportSession *exportSession, NSDictionary *info) { 
       CMTime videoDuration = CMTimeMultiplyByFloat64(exportSession.asset.duration, 1); 
       exportSession.timeRange = CMTimeRangeMake(kCMTimeZero, videoDuration); 
       NSLog(@"Byyte size = %lld", exportSession.estimatedOutputFileLength); 

       videoSize = exportSession.estimatedOutputFileLength; 
      }];