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The default FPS it's analyzing video at is 1, and I'm not sure the max is anywhere near enough to catch a full speed tennis serve.

Ah, I should have mentioned it was a slow motion video.

> The default FPS it's analyzing video at is 1

Source?

"By default 1 frame per second (FPS) is sampled from the video."

OK, I just used https://gemini.google.com/app, I wonder if it's the same there.