Motion blur
The streaking of moving objects inside a single video frame, caused by movement during the exposure. A little reads as smooth motion; too much looks smeared.
Updated
What it means
While the sensor exposes a frame, anything that moves keeps moving, so it is recorded as a soft streak rather than a sharp shape. That streak is motion blur. Its length depends on how fast the subject crosses the frame and on shutter speed - the longer each exposure, the longer the smear.
Our eyes expect some of it. When frames carry a natural amount of blur, motion flows smoothly even at 24 or 30 fps. When every frame is frozen sharp, fast movement looks staccato, a bit like a flip book. That is why filmmakers manage blur deliberately instead of trying to eliminate it.
How it works in practice
Action cameras on auto use very fast shutters in daylight, so their footage usually has almost no motion blur - handy for pulling crisp stills, less flattering for smooth pans. To add blur in camera, shooters slow the shutter with an ND filter, using the 180-degree shutter rule as a starting point.
Pilots of FPV drones care about this more than anyone: a cinematic dive at 1/50 or 1/60 s looks fluid, while the same flight at 1/2000 s looks jittery. Editing apps such as DaVinci Resolve and After Effects can also add synthetic blur afterwards, but it struggles with complex scenes and slows down the render.
What to watch out for
The biggest trap is blur combined with stabilization. Electronic stabilization crops and shifts each frame to cancel shake, but it cannot remove blur already recorded. On a bumpy handlebar mount with a slow shutter, the result is a steady frame in which the image still smears and pulses with every bump.
Low light causes accidental blur: when the camera runs out of ISO headroom, it lengthens the exposure, and night or indoor clips turn soft. Set the shutter manually or add light. And remember that blur is one-way - you can add it in post, but you cannot take it out of a smeared clip.
How RawClip handles it
RawClip does not stabilize footage, so the amount of blur is decided in the camera. The AI analyzes motion, jumps and faces across all your clips, removes dull and duplicate footage, and cuts the peak moments to the beat for a finished highlight.