Premiere Pro CS6

I would like to check with the PP experts here regarding rendering 4K to HD after using the warp stabilizer.

I have set the warp borders: Stabilize, crop, auto-scale. So in effect I have upscaled the clip.
Now I simply render out in HD.
What I would like confirmed is: As PP is non-destructive (till the 'go' button is pressed!) I presume it does not actually "upscale" then "downscale" but simply applies everyrthing in one go as if they were layers.

If I used: Stabilize, crop - without the auto-scale - then I end up with black borders I need to sort out - and I don't know the easiest way to sort them and auto-scale has them automatically sorted.

Is my method the best, and quickest, way of doing it?

Thanks for any help.

I don't have PP6 but Ae6, I will do it with automatic with Warp Stabilizer. Because it is difficult to predict where the border to be cropped..

If doing this way after you see the black boxes click and drag the preview so it fills with no black border. For me if the black boxes are close to 10% then it's really pushing the limit on enlarging. When you auto scale a 4K is where you may expand too much. After saving the 4K (if it's not expanded too much) then easy to have a pre-set for 1920x1080 that takes the full 4K and effectively reduces the pixel size to make the entire image fit the HD. Not sure if that is what you are asking.

I use stabilize for small movement but again 10% expansion is about my limit to keep the 4K. Maybe 25% expansion still should be good for rendering HD from the same clip. If there is that much movement watch closely for distortion or waves.

Thanks for the suggestions - I can see why you weren't sure what I was asking; because my explanation was a bit woolly ;-)

It's when rendering an HD from a UHD (4K) file that has been warp stabilised and has therefore been cropped.
I don't have Ae6 but looks as though it's very similar in this regard.

I knew what you are talking about. I watched a warp stabilizing tutorial video which appeared all sides black borders after stailizing. The author cropped manually every where to fit into a 1280X720 from a FHD. So I said may be automatically crop will be easier.
Yours may be a bit better than his, but I can imagine black border happened. Ae6 is no much different than PP6 in this sense.

Thanks for your replies. It's very handy to have the flexibility of rendering UHD to HD.