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NS_E_INVALIDINPUTFPS
The preprocessing stage requires a different input cadence
NS_E_INVALIDINPUTFPS (0xC00D1B81) is associated with preprocessing such as inverse telecine, not with ordinary playback. The requested operation expects a particular source frame cadence and the supplied input does not meet that requirement.
Measure the source, do not infer it
Capture the actual source frame rate and timestamps before preprocessing, whether the input is live or file-based, and the inverse-telecine/time-compression settings. Variable-frame-rate input or a nominal 30-fps label with different timestamps can matter here.
Choose a compatible workflow
Disable the preprocessing feature that requires the unsupported cadence, or supply source material with the cadence the feature expects. Retest with the same codec so the result proves the input-preprocessing relationship rather than a codec change.
Technical references
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