What is a rolling buffer?
A rolling buffer (also called pre-recording or pre-roll) continuously records video into a temporary memory loop before you press the record button. When you hit record, the camera saves the previous few seconds along with everything going forward — so you never miss the start of an unexpected moment.
How rolling buffer works
The camera constantly captures video into a small memory buffer — typically 3-5 seconds that overwrites itself in a loop.
When you press record, the buffered footage becomes the beginning of your clip, then recording continues normally.
When you stop, you have a clip that started a few seconds before you pressed the button. The moment that made you reach for record is already captured.
When rolling buffer saves the shot
Wildlife: An animal does something unexpected. By the time you hit record, the moment is already in the buffer.
Sports and action: The decisive play starts before you can react. Pre-roll captures it.
Documentary: Spontaneous moments happen without warning.
Events: Speeches, toasts, and surprises start before you expected.
Cameras with pre-recording at Camera Shop Egypt
Limitations to know
Rolling buffer uses power continuously because the camera is always recording to memory — this impacts battery life.
Buffer length is typically short — 3-5 seconds on most cameras. Some cinema cameras offer up to 15 seconds.
Not all cameras support this feature. Check specs for pre-recording, pre-roll, or rolling buffer.
If your camera supports pre-recording, enable it when shooting unpredictable subjects. The battery impact is minimal but the footage you save can be priceless.