kCVPixelBufferPoolMaximumBufferAgeKey
The key that sets how long the pool keeps an unused buffer before it ages out.
Declaration
let kCVPixelBufferPoolMaximumBufferAgeKey: CFStringDiscussion
Include this key in the pool attributes dictionary you pass to CVPixelBufferPoolCreate(_:_:_:_:).
By default, buffers age out after one second. Set an age of zero to turn off the age-out mechanism.