Vidu 540p has no Sume value: map Vidu resolution names

Vidu Q4 Preview lists 540p, 720p, 1080p, 2K and 4K, with 720p as the default. Sume's documented resolution values are 480p, 720p, 768p, 1080p, 1K, 2K and 4K, and each model accepts only a subset. 540p is not in the Sume list, so a request that sends it fails. Look up the supported values per model and choose on purpose.

Which names overlap?

Only some Vidu names exist on Sume.

How do you pick the replacement for 540p?

Choose by purpose. For a cheap draft take 480p; for a keeper take 720p. On wan-3.0 fal's page lists $0.05 a second at 480p and $0.10 at 720p (fal, read 2026-10-09), which Sume bills at 1.25 times, $0.0625 and $0.125. A 5-second draft is $0.3125, a 5-second keeper $0.625.

What does the guard look like?

Fill supported from supported_resolutions in GET /v1/videos/models at run time so the guard follows catalog changes.

def resolution_for(name: str, supported) -> str:
    if name in supported:
        return name
    raise ValueError(f"{name} not supported; choose from {sorted(supported)}")

wan = ["480p", "720p", "1080p"]
print(resolution_for("720p", wan))
try:
    resolution_for("540p", wan)
except ValueError as e:
    print(e)