How do I process photos from Photoshop CS in DxO FilmPack 5 ?

You can do this by recording a custom action (Window -> Actions) which contains DxO FilmPack 5 image changes.

Then choose File -> Automate -> Batch... and choose your recorded action.

Additional information about Actions can be found on Adobe's help site: https://helpx.adobe.com/photoshop/using/creating-actions.html