Miscalibrated 'Known-Good' Sample Caused Video Caption Safety Check to Silently Fail

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A developer building a video pipeline safety gate discovered that the reference sample used to calibrate a key threshold was itself a mismatched file pair, not a verified one. The gate was designed to detect whether burned caption output and its source preview were genuinely paired, by comparing whole-frame pixel differences — but the sole test episode had its preview re-rendered after the gate had already run, making it an invalid baseline. This caused the threshold to be set at 55, when a genuine matched pair actually produces a difference value of around 3, meaning an entire middle band of mismatched pairs passed undetected. As a result, the check falsely flagged a published episode with a 212-pixel safe-area violation that did not exist, caused by comparing two entirely unrelated frames. The author resolved the issue by generating a verified pair at burn time using a content-hash link, which revealed the correct three-band distribution and exposed the flaw in the original calibration.

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