First clip is 1920x1080, second is 3840x2160. Both stabilized using the automatic feature in FCPX. Tried to change some values, but didn't do much. Both is shot with 400mm, handheld. As you can see, the 4K-footage turns out all wobbling. This happens even on 135mm (handheld). Pretty much just 50mm turns out good. But I rarely have to stabilize 50mm.
Any idea why this happens with 4K-footage?
PS: This might also happen without stabilization. So it might not be the stabilization feature in FCPX. I shoot with 5d mk4
This is very common, and is why I (1) Try to avoid digital stabilization in post, and (2) Use several different stabilizing software packages.
It does seem worse with modern 4k cameras than with older small-sensor DV and 1080p camcorders. Part of this might be the change from a "global shutter" which was instantly sampled to larger sensors which have sequential readout. This is similar to what causes "jello effect".
Another complication (esp on telephoto shots) is parallax shift. Even slight camera movements causes the subject to shift in front of the background. From moment to moment small background details are hidden or revealed. If the camera frame shakes, the viewer sees that so the slight parallax shift seems normal.
But if digitally stabilized, the image is cropped and lateral distance from subject to frame edge is maintained constant. But the stabilizer can't hide the parallax shift. When the shift happens on a stabilized image it looks abnormal.
The best approach is use optical or physical stabilization when shooting. Each digital stabilizer uses different algorithms to try and get around these problems. You just have to try several of them (and pay for them).
400mm is almost impossible to hand hold. An optically stabilized lens helps a bit and a few cameras have both sensor-based and lens-based stabilization. But in general the longest lens I would hand hold would be 200mm (on a full frame camera), and that assumes the lens has good optical stabilization.
The Panasonic GH5 has excellent sensor-based stabilization, achievable since the small micro-4/3 sensor has plenty of mobility inside the chassis. Your 5D Mark IV has no sensor-based stabilization, and even my Sony A7RIII (which does have that) cannot really shoot 400mm hand held.
For a Safari, hike or mobile documentary work, one of the best solutions is a high quality monopod. I use the Manfrotto MVMXPRO500US:
There is also a 5-section carbon fiber version of it.
You are seeing the effects of INERTIACAM stabilizer, you want to you SMOOTHCAM. SmoothCam also gives you the option for Tripod Mode, assuming you are able to keep your RAW clip stable enough for the points of lock down to remain in the frame, or cut of the head and tail of the clip that might have enough motion to disturb Tripod Mode. I stabilize all the time for ENG, so I have gotten pretty good at holding my breath, framing for the knowledge that there will be a slight crop, and looking for sharp contrasty things to keep in the frame for Tripod Mode to key off of. InertiaCam has always had that jello effect, and it has to do with the way it tries to manipulate the scene movement. SmoothCam if attempted on very heavy movement in a scene can produce those black "off the edge of the shot" areas like you see on YouTube or FB auto-stabilized cell phone video. And I find 4K much easier to stabilize in FCPX due to the extra pixels to work with, especially when downsizing for HD output. FCPX also prefers 60p for stabilization over 24/30p, as the transitions between frames and movement are much easier to keep smooth.