Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards?

Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards? - Black Dodge Challenger Coupe

I always wonder, looking at certain movies (but especially TV commercials), why oversampling is not reduced someway. I think that you can recall any scene, both in movies or in TV commercials, in which there was a vehicle that proceeds afterwards, but its tyres seem to move backwards.

An example could be found in this video (even if it's nor a movie and a commercial):

Now, I understand that in movies this can be difficult to adjust: if it is an action scene, and the vehicle must be driven in a chase, or a context with explosion effects, it's almost impossible to synchronize car's speed and camera sampling. But in many TV commercials, with a scenery that is somewhat static, many times cars look to be proceeding backwards. Wouldn't it be sufficient to regulate the car's speed in respect to camera's sampling? Or maybe filming the car at different, progressive speeds and then cutting out the parts for which the speed is outside the range for which direction appears to be the right one?

More generally, do techniques exist in order to eliminate this phenomenon? And, if yes, why are they not always used?



Best Answer

This is a question of Frame Rate vs Speed. You can't just adjust frame rate to match speed, it's either 24FPS, 29.97FPS or 60FPS. You can't adjust that, unless you film in super slo-mo and adjust it later. But really, why go through that trouble when it doesn't hurt or hinder the shot? It'd been used in helicopter scenes since forever, and no one ever had an issue with it.

You'll notice the effect is eliminated once a car slows down. if you wanted to eliminate it, you could theoretically have the chase at 30MPH and speed up the film, but the resulting effect would be more undesirable than the current effect.

This used to happen with video of computer monitors or TVs, until refresh rates changed frequency.




Pictures about "Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards?"

Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards? - Free stock photo of asphalt, auto, automobile
Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards? - Black Suv Beside Grey Auv Crossing the Pedestrian Line during Daytime
Why is oversampling so "abused" in scenes with vehicles, that seem to moving backwards? - Multiethnic young couple in casual wear taking carton boxes out of automobile trunk near newly bought house on summer day





Anti-Asian Violence in Context: Historical Roots and Contemporary Connections - April 13, 2021




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Garvin St. Villier, Markus Spiske, Kaique Rocha, Ketut Subiyanto