45 Minutes of maintaining good gimbal technique is a herculean task. I'd say virtually impossible. I use an older Zhiyun Crane gimbal with a GH5 and generally only shoot about 30-60 seconds in a single smooth shot. And that requires a LOT of concentration. My G7 that I used before had no IBIS and required even more focus to maintain a good technique.
The Warp Stabilization effect is legitimately looking at the footage frame by frame and comparing it to the frames before and after it, tracking the footage as it goes. Its not a simple effect. It is very CPU intensive and your CPU is not very powerful for the task.
I have a Ryzen 7 8 core (16 thread) Cpu at 4Ghz and I just finished analyzing a 45 second long DCI-4k clip (24fps), it took approximately 10 minutes. That is 1,080 frames of footage to analyze. My system was analyzing my footage at approximately 1.8 frames per second. Your clip being 4k 60fps and 45 minutes long is 162,000 frames of footage. At that 1.8 frames per second my computer would take 81 HOURS to analyze that footage. And my System has 4 times the processing threads yours does at almost 1Ghz faster clock speed.
You are asking too much of the software I'm sorry to say.
I have to ask, why are you shooting 4k60? If you are stabilizing in post then you aren't speed ramping it to slower motion. And with the GH5s you cannot record 4k60 at 4:2:2 10-bit so you are losing out on a lot of the benefit of the cameras color capability just to generate far more frames than you need. I mean maybe you like the look of 60fps footage, but I'd rather have that color range and chroma sub-sampling over the fps.
I know I was asking too much of Premier. Which is why I’m now using Final Cut which stabilizes the video within an hour or so.
We can mark this one as solved by not using Premier.
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