[Camera App] How can I set the resolution of Preview different from captured photo?

Hi all,

I want to set the resolution of Preview different from captured photo,like the preview is 640*480 and captured photo is 2048*1536.

I tried:

await m_mediaCaptureMgr.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, property1);//640*480

await m_mediaCaptureMgr.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.Photo, property2);//2048*1536

but both preview and captured photo is 2048*1536 now.

Anybody can solve this problem?Thank you.