Video AI APIs silently return durations shorter than requested, developers warned

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A software developer has highlighted a systemic issue with video generation APIs, where requesting a specific clip duration — such as 10 seconds — often results in a shorter rendered file with no warning or error returned. The root cause lies in how latent video diffusion models compress frames internally, meaning only certain frame counts are mathematically valid given each model's frame rate and block size. When a requested duration does not align with these legal frame counts, the model silently rounds down to the nearest valid length. This discrepancy becomes a practical problem when multiple clips are assembled into a timeline, causing cumulative sync errors with audio or music. The developer recommends that engineers building on such APIs enumerate valid durations at build time and treat duration as a constrained value rather than a free input.

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