If anyone's watching the new Log Horizon season and hears a sharp G#9 (11.8Khz) sine wave for ~40 milliseconds starting at 00:16:33.200:
IT'S NOT FFMPEG'S FAULT. EITHER IT'S LIBFDK_AAC OR IT WAS PRESENT IN THE SOURCE.

It was bad enough for me to stop watching and investigate.

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Conducted some serious investigation.
The committee consisting of me and marcan looked through many sources, including the JP broadcast, into which the artifact was still present, and hereby conclude with a verdict of "it was made by the voice actress through the formation of a transient whistle, likely between the teeth and lips".

The resampling artifact theoryis ruled out due to it not presenting as such, and the theory it was an encoder error is also ruled out since the rest of the band looks normal and not energy-starved.
The encoder carried out its duties as directed and kept this during encoding.

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@lynne
Yay, one sine wave off the list.
How many are still left to investigate?

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