But generally what you hear is very close to how the person actually sounds - although their accent or inflections may be adopted for the purposes of their role. This can be a bit jarring; I've worked with method actors who maintain their screen accent at all times during production until the film is done, so when they switch back to their regular accent after a month or so it's extremely disorienting, since I've been listening to them in my headphones day in day out for weeks, and am paid to pay as much attention to their voices as the cinematographer pays to their faces.
Some actors go even farther in support of their public image. Rock Hudson had a somewhat high voice that producers deemed incompatible with his looks, so during production he would warm up every day by shouting for 20 minutes and gargling with orange juice to inflame his vocal cords, and of course he smoked a lot too. What actors will do to themselves in pursuit of screen presence far exceeds anything I've ever been asked to do in post. Editing dialog is more than enough work without trying to sculpt people's voices.
In the Indian film industry (maybe not so much Bollywood, but more of the local ones like Tamil, Malayalam, etc) there's a LOT more post being done. Some entire Malayalam films have dubbed voices (for the original movie). Not to mention nearly every song track does not have the singing recorded during the shooting of the dance sequences. So those sets and actor voices I would bet would be completely different.
For this particular film the rather characteristic look of digital video is appropriate, whereas most productions would rather shoot with much fancier gear. But you'll find plenty DSLRs working on film sets these days, and you will see more and more convergence as high-quality sensors become a commodity. Black Magic have a pocket camera that delivers 13 stops of dynamic range.
With two time samples you shouldn't be able to learn anything about the state of waves in a pool, but if each sample is a photograph with lots of pixels you can actually tell a lot.
> Because of a quirk in the design of most cameras’ sensors, the researchers were able to infer information about high-frequency vibrations even from video recorded at a standard 60 frames per second. While this audio reconstruction wasn’t as faithful as it was with the high-speed camera, it may still be good enough to identify the gender of a speaker in a room; the number of speakers; and even, given accurate enough information about the acoustic properties of speakers’ voices, their identities.
BTW: not everyone uses exactly your own personal guidelines.
BTW: HN Guidelines include "Resist complaining about being downmodded. It never does any good, and it makes boring reading."