iOS拍摄视频，压缩并上传服务器

//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
    ipc.cameraDevice = UIImagePickerControllerCameraDeviceFront;
    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
 //在录制视频的界面添加点东西
    UIView *BgView = [[UIView alloc] init];
    BgView.LYW_X = LYWScreenWidth*0.5 - 150*X6Scale;
    BgView.LYW_Y = 40*Y6Scale;
    BgView.LYW_W = 300*X6Scale;
    BgView.LYW_H = 200*Y6Scale;
    UILabel *lab = [[UILabel alloc] init];
    lab.LYW_X = 0;
    lab.LYW_Y = 0;
    lab.LYW_W = 300*X6Scale;
    lab.LYW_H = 200*Y6Scale;
    lab.text = @“http://www.jianshu.com/u/0158007b8d17”;
    lab.numberOfLines = 0;
    lab.textColor = [UIColor orangeColor];
    [BgView addSubview:lab];
    ipc.cameraOverlayView = BgView;
}

//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。
    _fileName = [NSString stringWithFormat:@"output-%@.mp4", [formater stringFromDate:[NSDate date]]];
    NSURL * url = [info objectForKey:UIImagePickerControllerMediaURL];
    NSString * urlStr = [url path];
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlStr)) {
        //保存视频到相簿，注意也可以使用ALAssetsLibrary来保存
        UISaveVideoAtPathToSavedPhotosAlbum(urlStr, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
    }
    [picker dismissViewControllerAnimated:YES completion:nil];
    [self convertVideoQuailtyWithInputURL:sourceURL outputURL:newVideoUrl completeHandler:nil];
}
#pragma mark - 自定义方法
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        NSLog(@"保存视频过程中发生错误，错误信息:%@",error.localizedDescription);
    } else {
        NSLog(@"视频保存成功");
        _videoUrl = videoPath;
        NSURL * url = [NSURL fileURLWithPath:videoPath];
       //  self.dateTimeLab.text = [LYWRegex getCurrentTimes];
        //获取视频第一帧
        // [self.showBtn setBackgroundImage:[LYWRegex thumbnailImageForVideo:url atTime:1] forState:UIControlStateNormal];
    }
}

#pragma mark - 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
                 _outputURL = outputURL;
                 //                 [self alertUploadVideo:outputURL];
                 break;
             case AVAssetExportSessionStatusFailed:
                 NSLog(@"AVAssetExportSessionStatusFailed");
                 break;
         }
     }];
}
-(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];
    }
}
#pragma mark - 上传视频
-(void)uploadVideo:(NSURL*)URL{
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    NSData *data = [NSData dataWithContentsOfURL:URL];
    dict[@"loanvideo"] = data;
    dict[@"record_id"] = self.loan_record_id;
    NSString *uploadVideoUrl = [NSString stringWithFormat:@"%@%@",BaseUrl,@"uploadloanvideo"];
    [[NetworkHelper shareInstance] Post:uploadVideoUrl parameter:dict data:data name:@"loanvideo" fileName:_fileName mimeType:@"video/mpeg" success:^(id responseObject) {
        NSLog(@"视频上传成功");
    } failure:^(NSError *error) {
        NSLog(@"视频上传失败");
    }];
}