iOS--相册视频MOV转MP4

相册视频MOV转MP4

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，

那么导入哪几个库就不用我说了吧

打开相册获取视频PHAsset

TZImagePickerController 这个库是个好东西

    TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:20 delegate:self];
    imagePickerVc.allowPickingVideo = YES;
    imagePickerVc.allowPickingImage = NO;
    [self presentViewController:imagePickerVc animated:YES completion:nil];

从相册获取到视频PHAsset之后

这时的 (PHAsset*)asset其实就是 AVURLAsset类型

-(void)imagePickerController:(TZImagePickerController *)picker
       didFinishPickingVideo:(UIImage *)coverImage
                sourceAssets:(PHAsset *)asset{
    
    /// 包含该视频的基础信息
    PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset: asset] firstObject];
   
    NSString *string1 = [resource.description stringByReplacingOccurrencesOfString:@"{" withString:@""];
    NSString *string2 = [string1 stringByReplacingOccurrencesOfString:@"}" withString:@""];
    NSString *string3 = [string2 stringByReplacingOccurrencesOfString:@", " withString:@","];
    NSMutableArray *resourceArray =  [NSMutableArray arrayWithArray:[string3 componentsSeparatedByString:@" "]];
    [resourceArray removeObjectAtIndex:0];
    [resourceArray removeObjectAtIndex:0];
    
    for (NSInteger index = 0; index<resourceArray.count; index++) {
        NSString *string = resourceArray[index];
        NSString *ret = [string stringByReplacingOccurrencesOfString:@" " withString:@""];
        resourceArray[index] = ret;
    }
    
    NSMutableDictionary *videoInfo = [[NSMutableDictionary alloc] init];
    
    for (NSString *string in resourceArray) {
        NSArray *array = [string componentsSeparatedByString:@"="];
        videoInfo[array[0]] = array[1];
    }
    
     NSLog(@"%@",videoInfo);

    PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
    options.version = PHImageRequestOptionsVersionCurrent;
    options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
    
    
    WS(weakSelf);
    PHImageManager *manager = [PHImageManager defaultManager];
    [manager requestAVAssetForVideo:asset
                            options:options
                      resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
                          
                          StrongSelf(strongSelf);
                          
                          NSString *sizeString = videoInfo[@"size"];
                          NSArray *array = [sizeString componentsSeparatedByString:@","];
                          CGSize size = CGSizeMake([array[0] floatValue], [array[1] floatValue]);
                          
                          [strongSelf choseVedioCompeletWithVedioAsset:(AVURLAsset *)asset
                                                         andAVAudioMix:audioMix
                                                          andVedioInfo:info
                                                          andImageSize:size];
                          
                      }];
}

为了避免循环引用，这里另写方法调用转码


- (void)choseVedioCompeletWithVedioAsset:(AVURLAsset *)urlAsset
                           andAVAudioMix:(AVAudioMix *)audioMix
                            andVedioInfo:(NSDictionary *)vedioInfo
                            andImageSize:(CGSize)size{
    //[self showLoadingView:@"处理视频数据"];
    WS(weakSelf);
    [RecordTools convertMovToMp4FromAVURLAsset:urlAsset
                           andCompeleteHandler:^(NSURL * _Nonnull fileUrl) {
                               StrongSelf(strongSelf);
                               [strongSelf hideLoadingView];
                               [strongSelf addVideoToTableCompeletWithVedioAsset:urlAsset
                                                                   andAVAudioMix:audioMix
                                                                    andVedioInfo:vedioInfo
                                                                    andImageSize:size
                                                                   andMP4FileUrl:fileUrl];
                           }];
    
    
}

检查视频文件的合规性

//30*1024*1024 B 字节
#define VideoSizeMax  31457280

- (void)addVideoToTableCompeletWithVedioAsset:(AVURLAsset *)urlAsset
                                andAVAudioMix:(AVAudioMix *)audioMix
                                 andVedioInfo:(NSDictionary *)vedioInfo
                                 andImageSize:(CGSize)size
                                andMP4FileUrl:(NSURL *)MP4FileUrl{
    if (MP4FileUrl == nil || MP4FileUrl.path == nil) {
        showMsg(@"视频获取失败");
        return;
    }
    AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];
    generator.appliesPreferredTrackTransform = YES;
    generator.maximumSize = CGSizeMake(size.width, size.height);
    NSError *error = nil;
    CGImageRef img = [generator copyCGImageAtTime:CMTimeMake(0, 10) actualTime:NULL error:&error];
    
    UIImage *image = [UIImage imageWithCGImage:img];
    
    NSError *mp4Rrror = nil;
    
    // 检查文件属性 查看文件大小 是否超标
    NSDictionary *infoDict = [[NSFileManager defaultManager]attributesOfItemAtPath:MP4FileUrl.path error:&mp4Rrror];
    NSString *fileSizeString = infoDict[@"NSFileSize"];
    if (fileSizeString && !error) {
        NSInteger fileSize = fileSizeString.integerValue;
        if (fileSize>VideoSizeMax) {
            showMsg(@"视频最大不能超过30M");
            [[NSFileManager defaultManager] removeItemAtPath:MP4FileUrl.path error:&error];
            return;
        }
    }
    else{
        showMsg(@"视频获取失败");
        [[NSFileManager defaultManager] removeItemAtPath:MP4FileUrl.path error:&error];
        return;
    }
   
   // 你们不需要
    
//    if (self.lastSelectPath) {
//        [self.dataArray replaceObjectAtIndex:self.lastSelectPath.row
//                                  withObject:@{@"type":@"vedio",
//                                               @"value":MP4FileUrl,
//                                               @"image":image}];
//    }
//    else{
//        [self.dataArray addObject:@{@"type":@"vedio",
//                                    @"value":MP4FileUrl,
//                                    @"image":image}];
//    }
//    
//    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
//        
//        dispatch_async(dispatch_get_main_queue(), ^{
//            
//            [self.mainTableView reloadData];
//        });
//        
//    });

}

MOV转码MP4

+ (void)convertMovToMp4FromAVURLAsset:(AVURLAsset*)urlAsset andCompeleteHandler:(void(^)(NSURL *fileUrl))fileUrlHandler{

    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:urlAsset.URL options:nil];
    
    NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];
    
    if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality]) {
       
        //  在Documents目录下创建一个名为FileData的文件夹
        NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] stringByAppendingPathComponent:@"Cache/VideoData"];
       
        NSFileManager *fileManager = [NSFileManager defaultManager];
        BOOL isDir = FALSE;
        BOOL isDirExist = [fileManager fileExistsAtPath:path isDirectory:&isDir];
        if(!(isDirExist && isDir)) {
            BOOL bCreateDir = [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
            if(!bCreateDir){
                NSLog(@"创建文件夹失败！%@",path);
            }
            NSLog(@"创建文件夹成功，文件路径%@",path);
        }
        
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
        [formatter setDateFormat:@"yyyy_MM_dd_HH_mm_ss"]; //每次启动后都保存一个新的日志文件中
        NSString *dateStr = [formatter stringFromDate:[NSDate date]];
        
        NSString *resultPath = [path stringByAppendingFormat:@"/%@.mp4",dateStr];
        NSLog(@"file path:%@",resultPath);
        
        NSLog(@"resultPath = %@",resultPath);
        
        AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset
                                                                               presetName:AVAssetExportPresetMediumQuality];
        exportSession.outputURL = [NSURL fileURLWithPath:resultPath];
        exportSession.outputFileType = AVFileTypeMPEG4;
        exportSession.shouldOptimizeForNetworkUse = YES;
        
        [exportSession exportAsynchronouslyWithCompletionHandler:^(void)
         {
             switch (exportSession.status) {
                 case AVAssetExportSessionStatusUnknown:
                     NSLog(@"AVAssetExportSessionStatusUnknown");
                     fileUrlHandler(nil);
                     break;
                 case AVAssetExportSessionStatusWaiting:
                     NSLog(@"AVAssetExportSessionStatusWaiting");
                     fileUrlHandler(nil);
                     break;
                 case AVAssetExportSessionStatusExporting:
                     NSLog(@"AVAssetExportSessionStatusExporting");
                     fileUrlHandler(nil);
                     break;
                 case AVAssetExportSessionStatusCompleted:
                     NSLog(@"AVAssetExportSessionStatusCompleted");
                     fileUrlHandler(exportSession.outputURL);
                     break;
                 case AVAssetExportSessionStatusFailed:
                     NSLog(@"AVAssetExportSessionStatusFailed");
                     fileUrlHandler(nil);
                     break;
                     
                 case AVAssetExportSessionStatusCancelled:
                     NSLog(@"AVAssetExportSessionStatusCancelled");
                     fileUrlHandler(nil);
                     break;
             }
         }];
    }
}

请注意

上段代码请不要在模拟器上执行，哪怕你模拟器相册导入了视频也不要，因为

[AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];

没反应！！！！

这句话是其他帖子没写过的，可能他们没有在模拟器执行过，模拟器是可以导入视频和图片的，直接拖进去就OK。