Microsoft has formally confirmed that its August 2025 safety replace is inflicting important efficiency issues for customers of NDI (Community Machine Interface) know-how.
Content material creators, broadcasters, and IT professionals who put in the replace are reporting extreme lag, stuttering, and uneven audio/video when streaming between PCs, successfully disrupting manufacturing workflows that depend on the favored IP video protocol.
The problem arises from the cumulative replace KB5063878, launched on August 12, 2025, for Home windows 11 and Home windows 10. In accordance with Microsoft’s up to date launch well being dashboard entry on August 21, the corporate has acknowledged the issue, which impacts programs working OS Construct 26100.4946 and different current variations.
The efficiency degradation is most distinguished in streaming purposes like OBS (Open Broadcast Software program) and the official NDI Instruments suite. Customers have famous that the issue is particularly triggered when utilizing “Show Seize” on the supply machine to ship its display screen output to a different laptop on the community.
Critically, the difficulty persists even on networks with low bandwidth utilization, indicating the foundation trigger shouldn’t be community congestion however quite a processing or protocol-handling flaw launched by the Home windows replace.
In an announcement on its well being dashboard, Microsoft detailed the signs: “Extreme stuttering, lag, and uneven audio/video may happen when utilizing NDI (Community Machine Interface) for streaming or transferring audio/video feeds between PCs after putting in the August 2025 Home windows safety replace.”
The affected platforms embody:
Consumer: Home windows 11, model 24H2; Home windows 10, model 22H2; Home windows 10, model 21H2
Server: No Home windows Server variations are at present listed as affected.
Mitigations
Whereas Microsoft investigates a everlasting resolution, a short lived workaround has been recognized and beneficial by NDI. The problem seems to be associated to NDI’s default transport protocol, RUDP (Dependable Consumer Datagram Protocol), which is designed to supply a stability between the velocity of UDP and the reliability of TCP.
The KB5063878 replace appears to intrude with how Home windows handles these RUDP packets.
To mitigate the issue, customers are suggested to manually change the NDI Obtain Mode on the receiving consumer to make use of both TCP (Transmission Management Protocol) or UDP (Consumer Datagram Protocol) as an alternative of the default setting.
NDI has revealed steerage on its help website, titled “Visitors Drops After Home windows Replace,” which offers step-by-step directions for making this transformation inside the NDI Instruments and different suitable purposes.
Microsoft has said, “We’re investigating this subject and can present extra data when it’s accessible.” This affirmation suggests {that a} repair will doubtless be delivered by way of a future cumulative replace or a doable out-of-band (OOB) patch.
Till then, professionals who depend on NDI for stay streaming, distant manufacturing, or company AV shows ought to both apply the TCP/UDP workaround or take into account pausing the deployment of the KB5063878 replace of their manufacturing environments to keep away from service disruption.
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