Humanparody
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Very informative post and attached video, thank you.
As the sensor always delivers native 4k, the lower resolutions are usually downsized in software. So your best choice is to always recording the full 4k, and when you encounter difficult things like moire patterns, deal with them in post processing by experimenting with different parameters and do manual downsizing (if you don't want to stay in 4k).
In any case, moire is emphasized by sharpening. So, go into the Go app -> Video camera settings -> Style, select Custom, and dial down the sharpness control to -2 or -3. Explanation: the sensor has an antialising filter in front of it to avoid moire. That filter slighly blurs the image, which is usually compensated by sharpening the resulting image. That is why the default settings for all Jpegs and h.264 video include a fair amount of sharpening. Often however, the default is way too much, and moire becomes visually apparent again. Thus, sharpening is also something that should be applied in post where it can be controlled. Dial it down in camera settings if you don't want to ruin your original footage. You will have plenty of control and time, on a big screen, to apply proper sharpening later.
That antialiasing filter is needed for cameras of that resolution around 12 MP. Without it, we would have moire all over the place. Cameras in the 20-40 MP range can get away without it, more recent Nikon DSLRs for example do no longer have one.
This video does a good job of summarizing and explaining all the Mavic video settings:
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