减少具有videoQuality:UIImagePickerControllerQualityTypeIFrame960x540的视频的内存大小

Question

我正在从我的iPhone应用程序录制视频并将其上传到服务器。视频需要有一个16:9的纵横比，所以我设置

[videoRecorderController setVideoQuality:UIImagePickerControllerQualityTypeIFrame960x540]

有没有办法减少视频的内存大小，并保持16:9的宽高比？

Answer 1

这对我很有帮助：

- (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);
 }];
}