Warp Stabilizer 4K to HD - does PPcs6 interpolate first then downsize when using "stabilize, crop, autoscale?

I am using CS6. I have warp stabilized my 4K footage and want to output to HD at the best quality I can. I have two choices: I can either have warp stabilizer "stabilize, crop auto scale" then I simply render to HD or I can set "stabilize, crop" and then get rid of the black border (crop) using AME in export settings. So my question is: If I use option 1 does PP interpolate the footage and then "downsize" to HD thus reducing quality? Or Does PP make all the calculations "in one go" so the footage isn't actually interpolated then reduced? I hope I have explained this clearly - though I fear not :-) Thank you for any comments. Paul

I've been experimenting exactly the same.  My conclusion is that stabilize, crop, auto scale does indeed crop the video first, then rescale back to the original frame resolution. So there is some loss of quality.  I've been working on 4K video and warp stabilizing first (no crop, no auto scale), then cropping as a nested sequence to HD (with key-framing to follow the action).  Depending on the amount of crop, what the video content is, and because you're starting with 4K footage to begin with, it's debatable as to whether the final HD rendered output is visually any different whatever method you choose.  I guess you'll only find out by trial and error.
Steve

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