Camera's are not the same as reality. They take images at a certain number of frames per second. 24, 30 or 60 are common frame rates for digital cameras. Thus, the camera is effectively its own strobe.
Since the frequency in the speaker is 24 hertz and camcorders can be set at 24 frames per second, it is likely that this is what is happening here-- the speaker frequency is causing pressure differentials in the water, the water's surface tension causes the succession of drops to form similar shapes, and the camera taking an image at the same frequency of as the speaker makes things look still because the drops are in exactly the same spot each frame.
You can notice on one of the lower bubbles further away from the spout the effect is less precise and the bubble seems to be changing shape or moving around.... this is because the effect of he speaker on the water decreases over time as the water gets further away and air turbulence causes the drops shape to pick up more randomness.
Since the frequency in the speaker is 24 hertz and camcorders can be set at 24 frames per second, it is likely that this is what is happening here-- the speaker frequency is causing pressure differentials in the water, the water's surface tension causes the succession of drops to form similar shapes, and the camera taking an image at the same frequency of as the speaker makes things look still because the drops are in exactly the same spot each frame.
You can notice on one of the lower bubbles further away from the spout the effect is less precise and the bubble seems to be changing shape or moving around.... this is because the effect of he speaker on the water decreases over time as the water gets further away and air turbulence causes the drops shape to pick up more randomness.