如何在iPhone中捕捉視頻

Question

我正在爲iPhone中的視頻應用程序創建應用程序，但我不知道如何在iPhone中捕捉視頻;我想將它們存儲在SQLite數據庫中，但我有一個問題：我可以將直接視頻保存在SQLite數據庫中嗎？是可能的，或者我必須存儲視頻路徑？如果我必須在SQLite數據庫中保存路徑，那我該怎麼做？請幫助解決這個問題。

Answer 1

只有iPhone 3GS及以上版本支持視頻錄製。因此，您應該首先檢查是否支持錄製，然後使用以下代碼啓動具有爲屬性設置的所需值的攝像機。
您將擁有「MobileCoreServices/MobileCoreServices.h」來運行此代碼。

  if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {    
       UIImagePickerController *videoRecorder = [[UIImagePickerController alloc]init];   
       NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:videoRecorder.sourceType]; 
       NSLog(@"Available types for source as camera = %@", sourceTypes); 
       if (![sourceTypes containsObject:(NSString*)kUTTypeMovie]) { 
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil 
                    message:@"Device Not Supported for video Recording."                  delegate:self 
                  cancelButtonTitle:@"Yes" 
                  otherButtonTitles:@"No",nil]; 
        [alert show]; 
        [alert release]; 
        return; 
       } 
       videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera; 
       videoRecorder.mediaTypes = [NSArray arrayWithObject:(NSString*)kUTTypeMovie];   
       videoRecorder.videoQuality = UIImagePickerControllerQualityTypeLow; 
       videoRecorder.videoMaximumDuration = 120; 
       videoRecorder.delegate = self; 
       self.recorder_ = videoRecorder;     
       [videoRecorder release]; 
       [self presentModalViewController:self.recorder_ animated:YES];     
      } 

那麼你應該實現以下的委託方法保存在SQL捕獲的video.Storing視頻路徑/ coredata將是理想的，而不是存儲整個視頻文件在裏面。

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 
NSString *type = [info objectForKey:UIImagePickerControllerMediaType]; 
if ([type isEqualToString:(NSString *)kUTTypeVideo] || 
    [type isEqualToString:(NSString *)kUTTypeMovie]) { // movie != video 
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
    NSData *videoData = [NSData dataWithContentsOfURL:videoUrl]; 
    NSString *videoStoragePath;//Set your video storage path to this variable 
    [videoData writeToFile:videoStoragePath atomically:YES]; 
    //You can store the path of the saved video file in sqlite/coredata here. 
} 
} 

希望這會有所幫助。

Answer 2

您將能夠將視頻數據作爲原始數據存儲在sqlite中，但我強烈建議不要這樣做。表現會很糟糕。最好將視頻保存到文檔目錄，然後將其保存到數據庫中。

如果您使用SQLite的工作，那麼你應該看看CoreData，這使得管理持久性容易得多...下載的源代碼，我的核心數據教程，因爲它包含了一個很好的存儲服務包裝... tutorial here