System pressure is beyond critical, so the capture system has shut down.
SDKs
Framework
static let shutdown: AVCaptureWhen system pressure reaches this level, the capture system automatically shuts down, causing a session interruption. Use the AVCapture in the interruption notification's user dictionary to find details about the system pressure factors causing the interruption.
static let nominal: AVCaptureSystem pressure level is normal (not pressured).
static let fair: AVCaptureSystem pressure is slightly elevated.
static let serious: AVCaptureSystem pressure is highly elevated. Capture performance may be impacted. Frame rate throttling is advised.
static let critical: AVCaptureSystem pressure is critically elevated. Capture quality and performance are significantly impacted. Frame rate throttling is highly advised.