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NS_E_INVALID_VIDEO_FPS
The requested output frame rate is not valid
NS_E_INVALID_VIDEO_FPS (0xC00D1BC5) is an output-profile validation result. The encoder rejected the configured frames-per-second value before normal encoding could proceed. The source can preview correctly and still fail here because the output codec accepts only particular rates or representations.
Check representation as well as value
Record numerator/denominator or time-per-frame values, any conversion from 29.97/23.976-style rates, codec, and output format. Integer rounding or using milliseconds where 100-nanosecond units are expected can create a value that looks reasonable in a UI but is invalid in the profile.
Verification
Choose a frame rate explicitly supported by the selected codec and leave bitrate, dimensions, and preprocessing unchanged. Validate again before attempting a full encode.
Technical references
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