>Would there be an audible hum in the video it records from the 4x propellers?
100% yes and this is why every drone video ever has music over it.
100% yes and this is why every drone video ever has music over it.
A solution would be to have Snap™ mics that i clip on to my shirt and it syncs with the video while recording.
That and even without the buzz anything most drones picked up would not be meaningful sound. Most are too far away and moving too much to pick up voices, better to just record off your phone to get conversation and/or ambient noise.
I'm almost surprised they even put a mic on this thing, though I'm sure from a product marketing perspective people would ding them for not having one.
But adaptive filters used in noise-cancelling headphones with separate mics may work. One directional microphone records sound from the scene, the other undirected one records sound of the drone, then filter tries to minimize drone sound component in the signal from the mic by adjusting coefficients of the filter.