视频的压缩

#import "ViewController.h"#import@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // 视频压缩  就是视频以低质量导出    // 1.需要视频    // 2.选择质量    // 3.视频的名称    // 4.保存的路径    // 5.视频的类型}- (IBAction)btnClicker:(id)sender{    // 1.判断相册是否可用    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {        NSLog(@"相册不可用");        return;    }        // 2.创建相册选择控制器    UIImagePickerController *pickerC = [[UIImagePickerController alloc] init];    // 3.设置来源    pickerC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    // 4.设置代理    pickerC.delegate = self;    // 5.设置可以选择的类型    pickerC.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];    // 5.弹出控制器    [self presentViewController:pickerC animated:YES completion:nil];}- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info

{

NSLog(@"选择了照片");

NSLog(@"%@",info);

// UIImagePickerControllerMediaURL

// 获取视频url

NSURL *url = info[UIImagePickerControllerMediaURL];

[self exportUrl:url];

// 销毁控制器

[picker dismissViewControllerAnimated:YES completion:nil];

}

- (void)exportUrl:(NSURL *)url

{

// 2.选择质量

// 3.视频的名称

// 4.保存的路径

// 5.视频的类型

// 获取视频资源

AVAsset *asset = [AVAsset assetWithURL:url];

// 创建导入会话

AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality];

// 导出的路径

NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"123.mov"];

NSURL *fileUrl = [NSURL fileURLWithPath:path];

exportSession.outputURL = fileUrl;

NSLog(@"%@",exportSession.supportedFileTypes);

// 导出的视频类型

exportSession.outputFileType = @"com.apple.quicktime-movie";

// 开始导出视频

[exportSession exportAsynchronouslyWithCompletionHandler:^{

NSLog(@"导出成功");

}];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

NSLog(@"取消");

// 销毁控制器

[picker dismissViewControllerAnimated:YES completion:nil];

}

@end