NDI/OBS Streaming Stutter and Choppy Audio/Video on Windows 11 24H2 After August 2025 Cumulative Update

Indicators

• Severe video stuttering and frame drops during NDI or OBS streaming sessions
• Choppy or intermittent audio in NDI/OBS output streams
• Lag in captured or transmitted video — particularly noticeable when Display Capture source is active in OBS
• Issue onset correlates with installation of August 2025 Windows 11 24H2 cumulative updates
• Symptoms resolve or significantly improve when Display Capture is disabled in OBS

Likely causes

• Regression introduced in the August 2025 cumulative updates for Windows 11 24H2 adversely affecting display capture subsystem interactions with NDI streaming tools
• Display Capture functionality in OBS and NDI tools conflicting with changes made to graphics/capture APIs in the August 2025 update

Diagnostic steps

1. Run winver to verify the Windows 11 version and currently installed update build
   Confirms the system is running Windows 11 24H2 with August 2025 updates, placing it within the affected version and patch window
2. Check Windows Update history via Settings > Windows Update > Update History, or run PowerShell: Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 20
   Identifies whether the August 2025 cumulative update is present and whether the September 2025 fix has already been applied
3. Reproduce the stutter in OBS/NDI with Display Capture enabled, then disable the Display Capture source and observe whether the stutter ceases
   Correlates the symptom specifically to Display Capture as the trigger, consistent with Microsoft's documented behaviour
4. Check Windows Update for pending updates via Settings > Windows Update and confirm whether the September 2025 cumulative update is available or already installed
   Determines whether the official Microsoft fix is available for deployment to resolve the regression
5. As a temporary workaround, disable the Display Capture source in OBS/NDI tools and substitute a Window Capture or Game Capture source, then retest streaming quality.
   Confirms Display Capture as the triggering component and provides an actionable interim mitigation while the September 2025 update is sourced.

Resolution path

• Navigate to Settings > Windows Update on the affected Windows 11 24H2 system and check for updates
• Download and install the September 2025 cumulative update for Windows 11 24H2; reboot when prompted
• After reboot, verify the installed build reflects the September 2025 update level via winver or Settings > System > About
• Retest NDI/OBS streaming with Display Capture enabled to confirm stutter is resolved
• If the September 2025 update cannot be immediately applied, switch to Window Capture or Game Capture in OBS/NDI tools as a temporary workaround to reduce stuttering.
• If rollback is required, uninstall the August 2025 cumulative update via Settings > Windows Update > Update History > Uninstall Updates, then pause Windows Update to prevent automatic re-installation until the September 2025 fix can be deployed.

Prevention

• Maintain a regular patching cadence and apply cumulative updates promptly — the September 2025 update resolved this regression; staying current prevents prolonged exposure to known regressions
• When new monthly cumulative updates are deployed in production streaming environments, validate NDI/OBS Display Capture functionality in a test system before broad rollout
• Monitor Microsoft Learn release notes and Windows Health Dashboard for known issues affecting streaming and capture workloads on each new cumulative update
• Subscribe to Microsoft Windows 11 known issues release notes and delay broad deployment of monthly cumulative updates by 2–4 weeks to allow regression identification before fleet-wide rollout.
• Configure Windows Update for Business or WSUS deferral policies to delay quality updates on production streaming/broadcast workstations, reducing exposure to regressions like the August 2025 NDI stutter issue.

Tools

• Windows Update / Settings (apply September 2025 cumulative update)
• winver (verify Windows 11 build version)
• OBS Studio (reproduce and verify streaming behaviour)
• NDI Tools (reproduce and verify NDI streaming behaviour)
• Get-HotFix (PowerShell cmdlet to audit installed updates)

References

• Microsoft Learn — NDI/OBS streaming stutter on Windows 11 24H2 after August 2025 updates