Precorder
Precorder is an iPhone app that constantly buffers video and only saves the last few seconds when you press the record button.
By constantly saving the previous few seconds of video before you hit record, Precorder lets you wait until something interesting happens to start recording, and you’ll never miss a precious moment or get stuck with hours of boring video to painstakingly edit down.
More info here. The creators were inspired by the camera used by the Planet Earth team to capture Great Whites jumping out of the water to catch seals.
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