AVPlayerViewController iOS視頻錄製，壓縮，上傳，預覽。

#import <AVKit/AVKit.h>
#import <AVFoundation/AVFoundation.h>

AVPlayerViewControllerDelegate
{
    AVPlayerViewController *mPMoviePlayerViewController;
}
//調用系統詳解
                UIImagePickerController *pickerCon = [[UIImagePickerController alloc]init];
                pickerCon.sourceType = UIImagePickerControllerSourceTypeCamera;
                pickerCon.mediaTypes = @[(NSString *)kUTTypeMovie];//設定相機爲視頻
                pickerCon.cameraDevice = UIImagePickerControllerCameraDeviceRear;//設置相機後攝像頭
                pickerCon.videoMaximumDuration = 10;//最長拍攝時間
                pickerCon.videoQuality = UIImagePickerControllerQualityTypeIFrame960x540;//拍攝質量
                pickerCon.allowsEditing = YES;//是否可編輯
                pickerCon.delegate = self;
                [self presentViewController:pickerCon animated:YES completion:nil];
//代理方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
//以下均是在使用攝像頭拍照情況下，在使用相冊或圖庫功能時大致相同
    // 獲取媒體類型信息
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        //如果是拍照
        UIImage *image;
        //如果允許編輯則獲得編輯後的照片，否則獲取原始照片
        if (picker.allowsEditing) {
            image=[info objectForKey:UIImagePickerControllerEditedImage];//獲取編輯後的照片

        }else{
            image=[info objectForKey:UIImagePickerControllerOriginalImage];
            //獲取原始照片

        }
        /* CGRect cropRect = [[info objectForKey:UIImagePickerControllerCropRect] CGRectValue]; UIImage * cropImage=[info objectForKey:UIImagePickerControllerOriginalImage]; UIImage *rotatedOriginalImage = [cropImage imageRotatedByDegrees:90.0]; CGImageRef imageRef = CGImageCreateWithImageInRect(rotatedOriginalImage.CGImage, cropRect); UIImage * resultImage = [UIImage imageWithCGImage:imageRef]; //以此法獲得的圖片即爲編輯後的圖片其中-imageRotatedByDegrees: 方法是將圖片順時針轉動90度的方法 */

        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image: didFinishSavingWithError: contextInfo:), nil);
        // 若保存到相簿後沒有其他操作可以：UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    }else if([mediaType isEqualToString:(NSString *)kUTTypeMovie]){//如果是錄製視頻
        NSURL *url=[info objectForKey:UIImagePickerControllerMediaURL];//視頻路徑
        NSString *urlStr=[url path];
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlStr)) {
            //保存視頻到相簿，注意也可以使用ALAssetsLibrary來保存
            UISaveVideoAtPathToSavedPhotosAlbum(urlStr, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);//保存視頻到相簿

            ////////000
            _videoURL = url;
            _collectionView.hidden = YES;
            self.backgroundIV.hidden = NO;
            self.playBtn.hidden = NO;
            self.backgroundIV.image= [self getImage:[[_videoURL absoluteString ] stringByReplacingOccurrencesOfString:@"file://" withString:@""]];
            aVideoUrlForPlay =  [NSString stringWithFormat:@"%@", _videoURL];


            NSLog(@"壓縮前視頻時長=%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:url]]);
            NSLog(@"壓縮前視頻大小=%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[url path]]]);
            NSURL *newVideoUrl ; //一般.mp4
            NSDateFormatter *formater = [[NSDateFormatter alloc] init];//用時間給文件全名，以免重複，在測試的時候其實可以判斷文件是否存在若存在，則刪除，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]]]] ;//這個是保存在app自己的沙盒路徑裏，後面可以選擇是否在上傳後刪除掉。我建議刪除掉，免得佔空間。
            [self convertVideoQuailtyWithInputURL:url outputURL:newVideoUrl completeHandler:nil];


            //        NSData *data = [NSData dataWithContentsOfFile:[url absoluteString]];
//            NSData *data = [NSData dataWithContentsOfFile:[NSString stringWithFormat:@"%@", [[_videoURL absoluteString ] stringByReplacingOccurrencesOfString:@"file://" withString:@""]]];



        }
    }
    [picker dismissViewControllerAnimated:YES completion:^{ }];
}
//壓縮
- (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];

    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeMPEG4;
    exportSession.shouldOptimizeForNetworkUse= YES;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void){
        switch (exportSession.status) {
            case AVAssetExportSessionStatusCancelled:
                break;
            case AVAssetExportSessionStatusUnknown:
                break;
            case AVAssetExportSessionStatusWaiting:
                break;
            case AVAssetExportSessionStatusExporting:
                break;
            case AVAssetExportSessionStatusCompleted:
                NSLog(@"壓縮後時長%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:outputURL]]);
                NSLog(@"壓縮後大小%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[outputURL path]]]);
                UISaveVideoAtPathToSavedPhotosAlbum([outputURL path], self, nil, NULL);//這個是保存到手機相冊
                [self alertUploadVideo:outputURL];
                break;
            case AVAssetExportSessionStatusFailed:
                break;
        }
    }];
}

//上傳提示
-(void)alertUploadVideo:(NSURL*)URL{
    _videoURL = 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 changeUserVideoView:URL];
    }else if(sizemb<=5){
        message = [NSString stringWithFormat:@"視頻%@，大於2MB會有點慢，確定上傳嗎？", sizeString];
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:message message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"確定", nil];
        [alertView show];
    }else if(sizemb>5){
        message = [NSString stringWithFormat:@"視頻%@，超過5MB，不能上傳，抱歉。", sizeString];
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:message message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:@"確定", nil];
        [alertView show];
    }
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0) {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil];
        [[NSFileManager defaultManager] removeItemAtPath:[_videoURL path] error:nil];//取消之後就刪除，以免佔用手機硬盤空間
    }else{
        [self changeUserVideoView:_videoURL];
    }
}
//上傳視頻
- (void)changeUserVideoView:(NSURL *)url{
    NSData *data = [NSData dataWithContentsOfURL:url];
//    NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

    self.navigationItem.rightBarButtonItem.enabled = YES;
    NSMutableDictionary *viedoExparams = [[NSMutableDictionary alloc]init];

    [viedoExparams addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:data,@"pic",nil]];
    [CKHttpCommunicate createRequest:HTTP_upload2Tmp WithParam:nil withExParam:viedoExparams withMethod:POST success:^(id result) {
        _selectedVideodWithImagrUrl = [NSString stringWithFormat:@"%@",result[@"d"]];
        if (_selectedVideodWithImagrUrl != nil) {
            [MBProgressHUD hideHUDForView:self.view animated:nil];
            self.navigationItem.rightBarButtonItem.enabled = YES;
        }
    } uploadFileProgress:^(NSProgress *uploadProgress) {
    } failure:^(NSError *erro) {
    }];
}
- (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];//獲取文件的屬性
        unsigned long long size = [[fileDic objectForKey:NSFileSize] longLongValue];
        filesize = 1.0*size/1024;
    }else{
        NSLog(@"找不到文件");
    }
    return filesize;
}//此方法可以獲取文件的大小，返回的是單位是KB。
- (CGFloat) getVideoLength:(NSURL *)URL
{

    AVURLAsset *avUrl = [AVURLAsset assetWithURL:URL];
    CMTime time = [avUrl duration];
    int second = ceil(time.value/time.timescale);
    return second;
}//此方法可以獲取視頻文件的時長。
// 照片保存到相簿的回調
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error) {
        NSLog(@"保存照片過程中發生錯誤，錯誤信息:%@",error.localizedDescription);
    }else{
        NSLog(@"照片保存成功.");
    }
}
// 視頻保存到相簿的回調
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error) {
        NSLog(@"保存視頻過程中發生錯誤，錯誤信息:%@",error.localizedDescription);
    }else{
        NSLog(@"視頻保存成功.");
        //錄製完之後可以使用AVPlayer自動播放
        NSURL *url=[NSURL fileURLWithPath:videoPath];
        NSLog(@"視頻路徑=%@", url);
    }
}







//上傳完畢後播放視頻方法
- (void)addPlayerView {
//    EditVideoViewController* cor = [[EditVideoViewController alloc] init];
//    cor.videoURL = _videoURL;
//    cor.isyulan = @"1";
//    [self pushViewController:cor animated:YES];
    // 2、初始化媒體播放控制器
    if (mPMoviePlayerViewController) {
        mPMoviePlayerViewController = nil;
    }
    // 3、配置媒體播放控制器
    mPMoviePlayerViewController = [[AVPlayerViewController alloc]  init];
    // 設置媒體源數據
    mPMoviePlayerViewController.player = [AVPlayer playerWithURL:_videoURL];
    // 設置拉伸模式
    mPMoviePlayerViewController.videoGravity = AVLayerVideoGravityResizeAspect;
    // 設置是否顯示媒體播放組件
    mPMoviePlayerViewController.showsPlaybackControls = YES;
    // 設置代理
    mPMoviePlayerViewController.delegate = self;
    // 播放視頻
    [mPMoviePlayerViewController.player play];
    // 設置媒體播放器視圖大小
    //    mPMoviePlayerViewController.view.bounds = CGRectMake(0, 0, 350, 300);
    //    mPMoviePlayerViewController.view.center = CGPointMake(CGRectGetMidX(self.view.bounds), 64 + CGRectGetMidY(mPMoviePlayerViewController.view.bounds) + 30);
    // 4、推送播放
    // 推送至媒體播放器進行播放
    [self presentViewController:mPMoviePlayerViewController animated:YES completion:nil];
    // 直接在本視圖控制器播放
    //    [self addChildViewController:mPMoviePlayerViewController];
    //    [self.view addSubview:mPMoviePlayerViewController.view];
}