Alright. I can see you created and configured the "4K" scene. That looks good to me. What did you do next in the "Render ..." dialog in VEGAS Pro?
Did you ...
- Customize and existing Voukoder Pro preset there and create a new one?
- If not ...
- customize the existing YUV 420 preset
- select the "4K" scene in that preset
- save the preset under a new name