Are the YouTube's 40 kHz videos real? Does YouTube allow such high frequency sound videos without compressing them?
Specifically this video.
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The audio sample rates YouTube seems to use are 48000 and 44100 Hz (for Opus and AAC). Only one of these formats (AAC) would even be able to be used with a higher sample rate (Opus specification says it's always 48kHz)
Since the maximum frequency able to be encoded is half of the sample rate, there is no way such a video could be real.