09-28-2021 07:12 PM
There's nothing you can do if you're using a camera/camcorder to record content from a display (iPad, computer display, TV, etc.)
You should instead do a direct screen recording on the device itself. If you have a Mac, you can also connect your iPad to the Mac, launch QuickTime Player, and choose New Movie Recording. You can select the input source by clicking on the little downwards pointing "<" to the right of the record button. Devices connected to your Mac will show up there.
09-29-2021 08:16 AM
Yes. It is an interaction between two devices that have pixel rows.
Similar to the effect when photographing shingle roofs or men's suits with pattern fabric.