20 B-roll clips of 5 seconds: Seedance 2.5, Fast or Mini, priced

A library of 20 five-second 16:9 B-roll clips costs $27.00 on Seedance 2.5 at 480p and $57.80 at 720p on Sume. The cheapest Seedance route, Mini at 480p, is $8.80 for the same twenty. B-roll rarely needs the top model: it is background, cut short, and often replaced.

Prices below are Sume's: provider list rate per 1,000 video tokens times 1.25, rounded up to the cent per job.

Price per five-second clip and per twenty

Choosing

Fast and Mini stop at 720p, so a 1080p library has only one Seedance option, 2.5 or 2.0. The 2.5 family also runs to 30 seconds per job; for 5-second B-roll that headroom is irrelevant.

A sensible split: draft every shot at Mini 480p, keep what survives, and re-run only the shots you need at 720p on 2.5. If a third of drafts survive, the plan costs $29.03 for seven final 720p clips from twenty drafts.

One caution

There is no seed on Seedance in Sume, so a rerun is a new draw, not a refinement of the draft. Treat a draft as a pitch for the shot, not as a preview of the final frame.