There is no 540p setting on this route, and that is a property of the model rather than a limitation of the workspace. The official image-to-video reference lists resolution options per model inside a single bullet list, and the entry for viduq3-pro-fast reads 720p with 1080p optional, while the entries for Pro and Turbo read 540p, 720p and 1080p. The official pricing table confirms the same absence by carrying no 540P row for this model ID. Two independently maintained official pages omit it, which is why the option is not offered here.
Duration is narrower here than the official range at both ends. Vidu documents 1 to 16 seconds with a default of 5, and this workspace exposes whole seconds from 2 to 15. That means a one-second test render is not available as a cheap sanity check, and neither is a full sixteen-second take. Plan the shot for the range that actually exists rather than for the documented one.
Two controls that Vidu documents for Q3 are absent from this page. Direct audio-video output defaults to on for the Q3 series, and this route exposes no switch for it, so the audio behaviour documented for the model is not a parameter you can set here. Off-peak scheduling is documented as a half-rate mode for Q3 with a 48 hour generation window and automatic cancellation with a refund for tasks that do not finish, and this route exposes no off-peak control either. Both are official capabilities that this page cannot offer, and both are stated rather than glossed over.
Finally, the Fast label should not be read as a published performance claim. The official description says faster generation speed and high cost-effectiveness without naming a baseline, and no latency figure, speed multiplier or throughput number appears in the documents this page relies on. The official FAQ is not a substitute for those numbers either: its duration and resolution answers still describe 360p, 720p and 1080p with four and eight second output, which contradicts the Q3 tables, so this page does not use it for specifications. Vidu publishes no discount or promotion for the Q3 range, and no third-party price, credit pack or ranking is used anywhere on this page.