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iOS视频录制（或选择）压缩及上传功能（整理）

最新做的一个功能涉及到了视频的录制、压缩及上传。根据网上诸多大神的经验，终于算是调通了，但也发现了一些问题，所以把我的经验分享一下。

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首先，肯定是调用一下系统的相机或相册

代码很基本：

//选择本地视频 
- (void)choosevideo 
{ 
 UIImagePickerController *ipc = [[UIImagePickerController alloc] init]; 
 ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//sourcetype有三种分别是camera，photoLibrary和photoAlbum 
 NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有两个分别是@"public.image",@"public.movie" 
 ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//设置媒体类型为public.movie 
 [self presentViewController:ipc animated:YES completion:nil]; 
 ipc.delegate = self;//设置委托 
} 
//录制视频 
- (void)startvideo 
{ 
 UIImagePickerController *ipc = [[UIImagePickerController alloc] init]; 
 ipc.sourceType = UIImagePickerControllerSourceTypeCamera;//sourcetype有三种分别是camera，photoLibrary和photoAlbum 
 NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有两个分别是@"public.image",@"public.movie" 
 ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//设置媒体类型为public.movie 
 [self presentViewController:ipc animated:YES completion:nil]; 
 ipc.videoMaximumDuration = 30.0f;//30秒 
 ipc.delegate = self;//设置委托 
}

iOS录制的视频格式是mov的，在Android和Pc上都不太好支持，所以要转换为MP4格式的，而且压缩一下，毕竟我们上传的都是小视频，不用特别清楚

为了反馈的清楚，先放两个小代码来获取视频的时长和大小，也是在网上找的，稍微改了一下。

- (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 = 1.0*size/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。

 接收并压缩

//完成视频录制，并压缩后显示大小、时长 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
 NSURL *sourceURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
 NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:sourceURL]]); 
 NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[sourceURL path]]]); 
 NSURL *newVideoUrl ; //一般.mp4 
 NSDateFormatter *formater = [[NSDateFormatter alloc] init];//用时间给文件全名，以免重复，在测试的时候其实可以判断文件是否存在若存在，则删除，重新生成文件即可 
 [formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss"]; 
 newVideoUrl = [NSURL fileURLWithPath:[NSHomeDirectory() stringByAppendingFormat:@"/Documents/output-%@.mp4", [formater stringFromDate:[NSDate date]]]] ;//这个是保存在app自己的沙盒路径里，后面可以选择是否在上传后删除掉。我建议删除掉，免得占空间。 
 [picker dismissViewControllerAnimated:YES completion:nil]; 
 [self convertVideoQuailtyWithInputURL:sourceURL outputURL:newVideoUrl completeHandler:nil]; 
} 
- (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 
      [self alertUploadVideo:outputURL]; 
      break; 
     case AVAssetExportSessionStatusFailed: 
      NSLog(@"AVAssetExportSessionStatusFailed"); 
      break; 
    } 
   }]; 
}

我这里用了一个提醒，因为我的服务器比较弱，不能传太大的文件

-(void)alertUploadVideo:(NSURL*)URL{ 
 CGFloat size = [self getFileSize:[URL path]]; 
 NSString *message; 
 NSString *sizeString; 
 CGFloat sizemb= size/1024; 
 if(size<=1024){ 
  sizeString = [NSString stringWithFormat:@"%.2fKB",size]; 
 }else{ 
  sizeString = [NSString stringWithFormat:@"%.2fMB",sizemb]; 
 } 
 if(sizemb<2){ 
  [self uploadVideo:URL]; 
 } 
 else if(sizemb<=5){ 
  message = [NSString stringWithFormat:@"视频%@，大于2MB会有点慢，确定上传吗？", sizeString]; 
  UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil 
                     message: message 
                   preferredStyle:UIAlertControllerStyleAlert]; 
  [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { 
   [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; 
   [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就删除，以免占用手机硬盘空间（沙盒） 
  }]]; 
  [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { 
   [self uploadVideo:URL]; 
  }]]; 
  [self presentViewController:alertController animated:YES completion:nil]; 
 }else if(sizemb>5){ 
  message = [NSString stringWithFormat:@"视频%@，超过5MB，不能上传，抱歉。", sizeString]; 
  UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil 
                     message: message 
                   preferredStyle:UIAlertControllerStyleAlert]; 
  [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { 
   [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; 
   [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就删除，以免占用手机硬盘空间 
  }]]; 
  [self presentViewController:alertController animated:YES completion:nil]; 
 } 
}

最后上上传的代码，这个是根据服务器来的，而且还是用的MKNetworking，据说已经过时了，放上来大家参考一下吧，AFNet也差不多，就是把NSData传上去。

-(void)uploadVideo:(NSURL*)URL{ 
 //[MyTools showTipsWithNoDisappear:nil message:@"正在上传..."]; 
 NSData *data = [NSData dataWithContentsOfURL:URL]; 
 MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"www.ylhuakai.com" customHeaderFields:nil]; 
 NSMutableDictionary *dic = [[NSMutableDictionary alloc] init]; 
 NSString *updateURL; 
 updateURL = @"/alflower/Data/sendupdate"; 
 [dic setValue:[NSString stringWithFormat:@"%@",User_id] forKey:@"openid"]; 
 [dic setValue:[NSString stringWithFormat:@"%@",[self.web objectForKey:@"web_id"]] forKey:@"web_id"]; 
 [dic setValue:[NSString stringWithFormat:@"%i",insertnumber] forKey:@"number"]; 
 [dic setValue:[NSString stringWithFormat:@"%i",insertType] forKey:@"type"]; 
 MKNetworkOperation *op = [engine operationWithPath:updateURL params:dic httpMethod:@"POST"]; 
 [op addData:data forKey:@"video" mimeType:@"video/mpeg" fileName:@"aa.mp4"]; 
 [op addCompletionHandler:^(MKNetworkOperation *operation) { 
  NSLog(@"[operation responseData]-->>%@", [operation responseString]); 
  NSData *data = [operation responseData]; 
  NSDictionary *resweiboDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; 
  NSString *status = [[resweiboDict objectForKey:@"status"]stringValue]; 
  NSLog(@"addfriendlist status is %@", status); 
  NSString *info = [resweiboDict objectForKey:@"info"]; 
  NSLog(@"addfriendlist info is %@", info); 
  // [MyTools showTipsWithView:nil message:info]; 
  // [SVProgressHUD showErrorWithStatus:info]; 
  if ([status isEqualToString:@"1"]) 
  { 
   [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; 
   [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//上传之后就删除，以免占用手机硬盘空间; 
  }else 
  { 
   //[SVProgressHUD showErrorWithStatus:dic[@"info"]]; 
  } 
  // [[NSNotificationCenter defaultCenter] postNotificationName:@"StoryData" object:nil userInfo:nil]; 
 }errorHandler:^(MKNetworkOperation *errorOp, NSError* err) { 
  NSLog(@"MKNetwork request error : %@", [err localizedDescription]); 
 }]; 
 [engine enqueueOperation:op]; 
}

以上所述是小编给大家介绍的iOS视频录制（或选择）压缩及上传功能（整理），希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！


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