減少videoQuality視頻的內存大小：UIImagePickerControllerQualityTypeIFrame960x540

Question

我正在錄製和從我的iPhone應用程序上傳視頻到服務器。視頻需要具有16：9的寬高比，所以我設置了

[videoRecorderController setVideoQuality:UIImagePickerControllerQualityTypeIFrame960x540] 

但是幾秒鐘的視頻需要幾MB的空間。

有什麼方法可以減少視頻的內存大小並保持16：9的寬高比？

Answer 1

這幫了我：

- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL 
           outputURL:(NSURL*)outputURL 
           handler:(void (^)(AVAssetExportSession*))handler 

{ 

AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil]; 
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality]; 
exportSession.outputURL = outputURL; 
exportSession.outputFileType = AVFileTypeQuickTimeMovie; 

[exportSession exportAsynchronouslyWithCompletionHandler:^(void) 
{ 
    handler(exportSession); 
}]; 
}