# VTFrameSiloGetProgressOfCurrentPass(_:progressOut:) Gets the progress of the current pass. ``` func VTFrameSiloGetProgressOfCurrentPass(_ silo: VTFrameSilo, progressOut: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `silo` The frame silo object. `progressOut` Upon return, contains the progress of the current pass. ## Return Value `kVTFrameSiloInvalidTimeRangeErr` if any time ranges are non-numeric, overlap or are not in ascending order. ## Discussion Calculates the current progress based on the most recent sample buffer added and the current pass time ranges. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)