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。

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我们网站的支持！