New field note: swap product video backgrounds without a green screen

Product clips are often shot in a cluttered room, on a messy desk, or in front of the wrong wall. Reshooting is expensive, but the footage itself is usually fine.
We published a hands-on note covering how AI background replacement isolates the subject, which shots hold clean edges best (avoid fast spins and translucent objects), and how to match lighting and shadows so the new background reads as real. The article is on the blog index for all three site languages. Questions or feedback: sapsap@qq.com.