Question 1

Do the two images need to share the same aspect ratio?

Accepted Answer

For the cleanest results, yes — match both images and the requested `aspect_ratio` to avoid cropping or letterboxing.

Question 2

How smooth is the transition?

Accepted Answer

Q3 Pro is tuned for smooth, prompt-guided interpolation. The longer the duration you pick, the more time the model has to ease between the two states.

Question 3

Can I leave one of the two images out?

Accepted Answer

No — first-last frames requires both. If you only have a starting image, use the Image-to-Video endpoint instead.