Thanks for the info on the proxy. That makes sense, I know when I dump new files into a project there's a little icon on each file saying that it's creating a shadow copy or something like that. I would guess that's the smaller workable file.Actually, jello is exacerbated by higher frame rates especially when coupled with higher shutter speeds (not using an ND filter).
Power Director does not need any external programs or devices to work with any footage for reduction BTW. A Proxy is simply a lower resolution version of the 4K clip. For instance unless and even if, you have a very good computer, scrubbing thru 4K footage on a time line is a big drain and it takes a lot of horsepower in a computer to do it so to speak. In PD when I bring a 4K clip into the library, it will begin to make a shadow (proxy) file of that very clip only at 720 at a fairly high compression. Now I can throw the shadow file onto the timeline and edit at will - effects, color correction , anything but now it will run it and I can scrub back and forth.
When it is time to render out, Power Director renders the full clip not the proxy, so I can select the resolution and all other other specs I want, in your case you would just set it to 1080 and whatever data rate and so fourth and render out.
The subject of ND filters and shutter speeds with video is a deep one and it is not necessarily intuitive. In video; especially like we shoot from a moving platform, motion blur should be present to get a natural look and High shutter speeds and frame rates erode that but I do understand that is becoming a look some want to go for. Here is a frame from a video running 30 FPS, 1/60th and an ISO of 100 which; is what I try to run most times. This is unedited and straight out of the camera. My Plus is orbiting me so everything that is moving in the scene has a natural motion blur while the subject pops into focus.
However I don't really have to worry about processing horsepower. I have a custom-built computer that was over $3,000: including the highest speed samsung nvme drives and a 7820X delidded, overclocked and water cooled, 64GB of RAM, 1080ti video, all the goodies. My other business besides photography is an IT consulting company that I've had for nearly 30 years - nice to have when needing more computing power.
The sun is so darn bright in Arizona that even when running a 4 stop nd16 filter at ISO 100 and shutter speed of 1/60 of a second. I definitely have blown out clouds. I need to get to an nd32 filter if possible, which I see a company called freewell makes but there are some complaints about it being a little heavy on the gimbal but workable. Otherwise I would just rather shoot at a higher shutter speed like I did in my shoots last year. I'm just confused as to why I had many clips previously shot on auto at a very high shutter speed without a single Jello effect at all, whether panning, gliding or manually controlling the flight. But if I can't eliminate the Jello effect I will have to track down that freewell ND32 filter.