The limiting factor with this is it requires 2-6000 fps video. I think this restriction can be lifted. Sound travels 2.8m in 1/120th of a second, a frame rate

The limiting factor with this is it requires 2-6000 fps video. I think this restriction can be lifted. Sound travels 2.8m in 1/120th of a second, a frame rate that is available in smartphone cameras today. Therefore, if you have a surface that can be analyzed for sound which is at least 2.8m long in the direction the sound is travelling, you have a snapshot through time of the effect the sound waves have on that surface for the whole ~8ms of the frame's duration (if you ignore the problem of progressive scanning). Does this sound reasonable? Maybe you'd need more than 2.8m. To get over the progressive scanning problem perhaps you could orient the camera so the direction of the scanning is orthogonal to the direction of sound propagation, then the image can be skewed to counteract the effect of the scanning.