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You can easily do this with microsoft clipchamp for free
Sorry, there was a problem. Please try again later.The HERO9 Black doesn't need anything else to record at those frame rates, but you will want to use an editor to shift those down to 30 fps (or some other lower fps) to have it show as slow motion. You can use GoPro's Quik app to do this, or you should be able to do this using most video editing programs like iMovie or VSDC.
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