在錄制視頻之前調用相機視圖時，我已經實現了疊加視圖。pickerController.cameraOverlayView =myOverlay;錄制視頻并通過電子郵件共享后，可以進行視頻錄制并將視頻保存到“相冊”中。如果我將視頻質量用作“高質量”，則錄制的視頻已經變得很大。例如，如果我以高質量錄制視頻30秒鐘，則錄制的視頻已變為30-40 mb。pickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;我如何編程才能在共享之前壓縮高質量的錄制視頻，就像Apple對內置視頻錄制器的處理方式一樣？請指導我解決此問題。謝謝！更新：這是我最近正在嘗試的方法，但仍然沒有成功：我想壓縮錄制的音頻，并將它們錄制到didFinishPickingMediaWithInfo并將其實際的視頻路徑本身存儲在同一相冊中，而不是其他位置。當我從照片庫中選取時，我測試了將相同的視頻壓縮到非常小的尺寸，但是雖然我使用了下面的AVAssetExportSession代碼，但是從相機拍攝并通過didFinishPickingMediaWithInfo來的相同視頻未壓縮。- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]){    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];    NSString *urlPath = [videoURL path];    if ([[urlPath lastPathComponent] isEqualToString:@"capturedvideo.MOV"])    {        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum (urlPath))        {            [self copyTempVideoToMediaLibrary :urlPath];        }        else        {            NSLog(@"Video Capture Error: Captured video cannot be saved...didFinishPickingMediaWithInfo()");                        }    }           else    {        NSLog(@"Processing soon to saved photos album...else loop of lastPathComponent..didFinishPickingMediaWithInfo()");    }}    [self dismissModalViewControllerAnimated:YES];}- (void)copyTempVideoToMediaLibrary :(NSString *)videoURL {        dispatch_queue_t mainQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);dispatch_async(mainQueue, ^{    ALAssetsLibrary *library = [[[ALAssetsLibrary alloc] init] autorelease];    ALAssetsLibraryWriteVideoCompletionBlock completionBlock = ^(NSURL *assetURL, NSError *error) {        NSLog(@"Saved URL: %@", assetURL);        NSLog(@"Error: %@", error);