iOS__压缩视频

/// 压缩视频

• (void) convertVideoQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL completeHandler:(void (^)(AVAssetExportSession*))handler { AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:inputURL options:nil];

  AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality]; // NSLog(resultPath); exportSession.outputURL = outputURL; exportSession.outputFileType = AVFileTypeMPEG4; exportSession.shouldOptimizeForNetworkUse= YES; [exportSession exportAsynchronouslyWithCompletionHandler:^(void) { switch (exportSession.status) { case AVAssetExportSessionStatusCancelled: NSLog(@"AVAssetExportSessionStatusCancelled"); break; case AVAssetExportSessionStatusUnknown: NSLog(@"AVAssetExportSessionStatusUnknown"); break; case AVAssetExportSessionStatusWaiting: NSLog(@"AVAssetExportSessionStatusWaiting"); break; case AVAssetExportSessionStatusExporting: NSLog(@"AVAssetExportSessionStatusExporting"); break; case AVAssetExportSessionStatusCompleted: NSLog(@"AVAssetExportSessionStatusCompleted"); NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:outputURL]]); NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[outputURL path]]]);

             //UISaveVideoAtPathToSavedPhotosAlbum([outputURL path], self, nil, NULL);//这个是保存到手机相册
             
             break;
         case AVAssetExportSessionStatusFailed:
             NSLog(@"AVAssetExportSessionStatusFailed");
             break;
     }
  

  }];

}

• (CGFloat) getFileSize:(NSString *)path { NSLog(@"%@",path); NSFileManager *fileManager = [NSFileManager defaultManager]; float filesize = -1.0; if ([fileManager fileExistsAtPath:path]) { NSDictionary fileDic = [fileManager attributesOfItemAtPath:path error:nil];//获取文件的属性 unsigned long long size = [[fileDic objectForKey:NSFileSize] longLongValue]; filesize = 1.0size/1024; }else{ NSLog(@"找不到文件"); } return filesize; }//此方法可以获取文件的大小，返回的是单位是KB。

• (CGFloat) getVideoLength:(NSURL *)URL {

  AVURLAsset *avUrl = [AVURLAsset assetWithURL:URL]; CMTime time = [avUrl duration]; int second = ceil(time.value/time.timescale); return second; }//此方法可以获取视频文件的时长。