Title: Audio out of sync (delayed) on NDI inputs only – vMix 27
Username: StreamTech_24
Posted: Today at 04:23 PM
Category: Audio / NDI
Hi everyone,
I’ve run into a strange issue that just started today. I’m running vMix 27 Pro on a Ryzen 9/64GB RAM/RTX 4070 machine. My main camera is connected via SDI (fine), but my secondary Zoom call (coming in via NDI Tools Screen Capture) has a noticeable audio delay – about 300-400ms behind the video.
What I’ve tried:
What works:
Question:
Is there a hidden setting in vMix to force NDI audio to "real-time" or bypass the internal buffering? Or could this be a Windows audio driver conflict with vMix’s low-latency mode?
Any insight would be hugely appreciated. Thanks!
Reply from Moderator (vMix Team) – Example:
Username: admin_martin
Posted: Today at 04:45 PM
@StreamTech_24 – Thanks for the detailed report.
First, check your vMix Audio Settings (gear icon next to master volume):
Second, for NDI specifically:
Finally – negative audio delay isn’t supported in vMix. You would need to delay the video to match the audio instead. Add a video delay filter (Filter → Video Delay) to the SDI source so both align.
Let us know if that solves it.
The vMix Forums serve as the primary official community hub for users of the vMix live video production software. It is a highly active space where users, ranging from beginners to professional broadcasters, exchange technical advice, share custom scripts, and suggest new features directly to the developers. Key Community Features
Technical Support: A dedicated space for troubleshooting hardware compatibility, NDI networking, and software bugs. vmix forum
Feature Requests: A section where users can propose and vote on new software capabilities, often seeing direct responses from the vMix design team.
Show & Tell: Users share their production setups, ranging from small church streams to complex multi-camera sporting events.
Custom Scripts & APIs: Advanced users post VB.NET scripts and custom API commands for external control surfaces like Bitfocus Companion. Core Topics & Discussions Vmix Companion Module API Exposure Request
The vMix Forums serve as the primary community hub for users to report bugs, request features, and troubleshoot technical issues. Users can submit bug reports, share crash logs, and utilize dedicated forums for feature requests and beta testing. For more details, visit vMix Forums. vMix Forums Bug report - vMix Forums
To prepare a technical "paper" or detailed documentation for the vMix Forums
, focus on providing high-quality technical detail that allows other users to replicate your workflow or troubleshoot specific hardware. Structure of a vMix Forum Technical Paper
A well-received contribution typically includes these sections: Abstract/Summary
: A brief overview of what you have achieved (e.g., "Implementing a low-latency NDI workflow over a 10Gbps local network"). System Specifications
: Community members need your hardware context to understand your results. Use the official vMix Supported Hardware list as a reference for minimum vs. recommended specs. : Specify model and capacity (e.g., 16GB DDR4). : Note the exact card, as vMix heavily leverages NVIDIA NVENC Workflow Diagram
: Explain how signals move from capture to output (e.g., Camera -> Decklink -> vMix -> NDI Out). Settings & Configuration : Detail specific software choices like frame rates
(29.97 vs. 60 fps), bitrates, and performance settings like "Low Latency Capture". Results & Discussion
: Provide logs or screenshots showing CPU/GPU usage during production. Conclusion
: Key takeaways or pitfalls you encountered, such as the need for dedicated hardware encoders Writing Best Practices Speak then Write
: If you're stuck, try explaining your workflow out loud to a peer and write down those main points. Use Visuals Title Editor
or screenshots of your production to illustrate complex "if-then" logic or scripting commands Format for Readability
: Use bold headers and bulleted lists so other users can quickly scan for the information they need. Supported Hardware | vMix
The vMix Forum (found at forums.vmix.com) is the official community hub for users of the vMix live production and streaming software. It serves as a critical resource for technical support, feature requests, and professional networking within the live video industry. 1. Community Purpose and Scope
The forum is designed to support the vMix ecosystem by providing a space where users can:
Troubleshoot Technical Issues: Users frequently post about hardware compatibility, such as NDI setup challenges involving cameras and network switches. Title: Audio out of sync (delayed) on NDI
Share Workflow Solutions: Discussions often cover complex integrations, like using vMix with external audio interfaces (e.g., Yamaha DM7) or third-party control software like Bitfocus Companion.
Feature Requests: A dedicated section allows users to suggest and vote on new software capabilities, directly influencing future vMix updates. 2. Key Discussion Themes
Common topics observed across the forum and related community groups include:
Networking and NDI: Extensive threads discuss managing bandwidth, resolving dropped frames, and ensuring synchronization across gigabit networks.
Stability and Performance: Users report and solve stability issues, such as crashes during vMix Calls or high CPU/GPU usage during multi-platform streaming.
Hardware Compatibility: Information on "vMix-ready" PC builds, capture cards, and the performance of various PTZ cameras. 3. Support Structure
The forum is moderated by vMix staff and a community of "Power Users."
Knowledge Base: Many threads function as an informal manual, documenting edge-case bugs and creative workarounds.
Direct Interaction: Unlike generic social media groups, the official forum is a primary place for developers to gather bug reports and defect data directly from the user base.
vMix is only as good as the foundation you build for it. By taking control of Windows Updates, Power Settings, and Network Traffic, you eliminate 90% of the variables that cause crashed shows.
I’d love to hear from the community—what is your number one "must-do" tip for keeping a system stable? Let me know in the replies!
At its core, the vMix Forum functions as an exhaustive, user-generated encyclopedia. Official documentation, while thorough, cannot anticipate every permutation of hardware configurations, network conditions, or creative ambitions that users encounter. The forum fills this gap. A search for “NDI latency issues” or “PTZ camera presets with vMix” yields hundreds of real-world troubleshooting threads, often with step-by-step solutions that evolve as software versions change. Unlike static help files, forum threads live and breathe: a solution posted in 2020 may be refined or superseded by a better method in 2023, and the conversation remains visible for all to see.
This temporal layering is invaluable. When a volunteer producer for a church service struggles with audio sync, they are not starting from scratch. They are inheriting years of accumulated wisdom from sports broadcasters, corporate event technicians, and esports streamers who have already wrestled with similar problems. The forum democratizes expertise, ensuring that advanced knowledge is not locked behind paywalls or formal training courses.
The vMix Forum is not merely a place to get unstuck. It is a living curriculum for live video production, a social space where passion for the craft transcends geographical and professional boundaries. For every user who joins to ask how to add a logo to their stream, there is another who stays to help debug a complex PTZ tracking script. In an industry where technology changes monthly, the forum provides a rare constant: human expertise, freely shared, continuously refined.
Whether you are a volunteer running a single camera for a town hall meeting or a broadcast engineer managing a 12-input 4K show, the vMix Forum offers something essential—a reminder that behind every great production is not just powerful software, but a community willing to teach, learn, and elevate the work of live media.
Vmix is a popular live streaming and video production software that allows users to create and stream high-quality video content. The vMix forum is an online community where users can discuss various aspects of the software, share knowledge, and get help from other users and the software developers.
Here's a report on the vMix forum:
Overview
The vMix forum is a dedicated online space for users of the vMix software. It's a place where users can ask questions, share tips and tricks, and collaborate with other users. The forum is available at https://www.vmix.com.au/forums/. Updated NDI Tools to v6 Set audio delay
Activity and Engagement
The vMix forum appears to be moderately active, with a decent number of posts and discussions happening regularly. According to my analysis, the forum has:
Topics and Discussions
The vMix forum covers a wide range of topics related to the software, including:
Community and Support
The vMix forum seems to have a supportive and helpful community. Many users actively engage with each other, offering advice and solutions to problems. The forum also has a few moderators and administrators who help manage the discussions and ensure that users follow the community guidelines.
Resources and Documentation
The vMix forum also hosts various resources and documentation, including:
Pros and Cons
Pros:
Cons:
Conclusion
The vMix forum is a valuable resource for users of the vMix software. It provides a platform for users to connect, share knowledge, and get help from other users and the software developers. While there are some areas for improvement, the forum appears to be well-maintained and active, with a supportive community and a wealth of information available.
Recommendations
If you're a vMix user, I highly recommend checking out the forum. You can:
If you're not a vMix user, but are interested in live streaming or video production, the forum may still be a useful resource for learning about the software and related topics.
The vMix Forums serve as the central hub for users to troubleshoot, share custom tools, and discuss advanced live production techniques. Common content and discussions on the forum include: Advanced Automation & Scripting
Dynamic Content Updates: Users share methods to update titles and inputs automatically using external data sources like XML files or Google Sheets.
Scripting for Beginners: Threads like "Scripting for Dummies" provide code snippets for complex tasks, such as renaming recordings based on input names or automating start/stop sequences.
Custom Apps: Community members often release third-party utilities, such as the vMix Script Builder App, which helps users create automation scripts without writing code. Third-Party Integration & Control How to dynamically change the content of an input?
A major shift in the forum’s focus came with vMix Replay (their answer to EVS or Dreamcatcher slow-motion servers). The forum is currently flooded with discussions on how to map keyboard shortcuts to instant replay buttons. Sports broadcasters, high school football streamers, and eSports producers use the forum to share macros that used to cost six figures in hardware.
