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I bet the audio directly from his mic would be enormously better quality than whatever YouTube has recorded. Plus Google can hardly afford to dedicate gigantic amounts of CPU to the transcription - they'll be going for a crude but useful job where for this demo he probably has a whole lot of CPU grunt just dedicated to it.

I really don't think youtube transcribes audio for every single user. You can see it's not available in many videos. I'd guess they run some test on the audio to see if it's worth transcribing, and only then run a background task to do the job.. doesn't really matter how fast.

You are right about the source quality though.

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