Frame rate (fps)

Frame rate is how many still images play per second, and it is the single biggest lever on whether footage reads as 'film' or as 'live video'. 24fps is the cinema standard and carries a slight, familiar strobe. 25 and 30fps read as broadcast and corporate. 50 and 60fps look hyper-real and clean, which is why they suit sports, screen recordings, and gameplay, and why narrative work usually avoids them. That last part is a convention audiences have learned, not a law of optics. Shooting 60 or 120 and delivering at 24 gives you clean slow motion.

Pair it with shutter angle. The 180-degree convention puts shutter speed at roughly 1 / (2 x fps), so 1/48s at 24fps and 1/120s at 60fps. It is the denominator that runs at double the frame rate, not the exposure time. That gives each frame natural motion blur. Break it and footage either turns jittery and staccato, the 'Saving Private Ryan' look, or smears into soup.

Gotcha: mixing frame rates on one timeline causes stutter, because 30fps clips in a 24fps sequence have to drop frames. Pick the sequence rate first and conform everything to it. Also watch the 29.97 versus 30 and 23.976 versus 24 distinction: those NTSC fractional rates are why audio slowly drifts out of sync over a long clip when someone assumed the round number.