One 15-second ad in 3 ratios: render once, crop twice on Sume

The short answer

For a 15-second ad in three aspect ratios, one 1080p render on Sume's Wan 3.0 plus two crops costs 15 x $0.25 + 2 x $0.02 = $3.79. Three separate renders cost 3 x $3.75 = $11.25. Vidu Q4 Preview, which Sume does not list, would be 15 x $0.045 = $0.675 per ratio at 540P list, or $2.025 for three, and 15 x $0.39 = $5.85 per ratio at 4K. Vidu's release does not state its supported aspect ratios, so confirm them with the vendor.

The comparison

Each row below covers a 15-second ad delivered in three ratios. The crop route uses Sume's video filter, which costs $0.02 per job.

What a crop costs you

The crop cuts pixels. A 1920x1080 master cropped to 9:16 leaves about 608 x 1080, and a 1:1 crop leaves 1080 x 1080. That is fine for a feed ad at 1080 high, but it throws away two thirds of the frame for vertical. Compose the master so the subject sits in the centre third, keep captions and logos inside that strip, and test the vertical crop before you approve the master. A crop of a 16:9 frame will always sit tighter than a native vertical shot, and fast sideways motion can leave the strip.

The crop route also keeps the three versions identical in timing and content, which a three-render approach does not, because each render is a fresh generation.

When to render three times

If each ratio needs its own composition, as with a close-up for vertical, render natively. Check that your row lists the ratio in supported_aspect_ratios through GET /v1/videos/models in the video generation docs. The video filter crop takes fractions of the frame, with x and y in 0 to 1 and width and height in 0.05 to 1, as the video filter docs describe.

Sizing the saving: for a campaign of 20 ads, rendering three ratios each with Wan 3.0 at 1080p costs 20 x $11.25 = $225.00. Rendering once and cropping twice costs 20 x $3.79 = $75.80. The difference is $149.20, which is 66% of the three-render cost, and it grows with the model price: at Seedance 2.0 1080p the same campaign is 20 x $38.2725 = $765.45 against 20 x ($12.7575 + $0.04) = $255.95.