---
title: VTMotionEstimationSession.BlockSize.blockSize4x4
framework: Video Toolbox
role: symbol
role_heading: Case
platforms: [iOS 26.0+, iPadOS 26.0+, Mac Catalyst 26.0+, macOS 26.0+, tvOS 26.0+, visionOS 26.0+]
path: videotoolbox/vtmotionestimationsession/blocksize/blocksize4x4
---

# VTMotionEstimationSession.BlockSize.blockSize4x4

## Declaration

```swift
case blockSize4x4
```