vMix: What You Need to Know

This article covers the key aspects of vMix, informed by our customers' experiences. We spoke with several major broadcasting companies, and here’s what we gathered:

Main issue: The Challenge of vMix and Windows PC Reliability

vMix is one of the top programs for live video production. However, many operators setting up video configurations to record lectures and events face a common problem: Windows as a "single point of failure." If the system or operating environment crashes, all recordings are lost. The advantages of this approach include the simplicity of setup and the use of popular tools like vMix, which allow multi-channel recording, streaming, and editing in one solution. However, the downside is the dependency on Windows stability and the risk of losing the recording if the OS freezes or fails.

1. Using NDI over SRT and vMix on AWS EC2 (Most reliable way)

NDI enables the transmission of video and audio signals over local network, and many operators rely on it as an easy way to set up a backup. With NDI, several machines can connect and record the same streams.

However, disadvantages arise as the setup scales: NDI is bandwidth-intensive and network-sensitive, and even a minor network issue can cause signal loss. The best way is using NDI and vMix in the cloud:

• Learn more about cloud NDI
• vMix in the cloud on Amazon EC2
• Set up redundant NDI over IP with Bonding
• Convert SRT streams into cloud NDI
• Sync NDI streams in the cloud

2. External or Cloud Recorders as Backup

Many users suggest using external recorders, such as Atomos Shogun, Blackmagic Hyperdeck, or AJA Kumo. These devices connect via an SDI output and can simultaneously record the main computer's output. The benefits include having an independent backup system with its own built-in recording functionality, reducing the risk of data loss due to Windows or vMix crashes. However, the disadvantages include the need for additional hardware costs, which may not be feasible for budget-conscious projects.

• Learn more how you can use cloud recorder with failover.
• Record and Download your Event at the same time using cloud recorder. 
• Automatically split your recording into equal-length segments

3. Channel Splitting via SDI Matrices

To increase redundancy, some recommend using SDI matrices, which allow routing inputs and outputs between devices with the push of a button. This is particularly useful for multi-channel setups where several cameras and monitors connect to a single computer. SDI matrices make it easy to switch channels to a backup device if the main one fails. Pros of this approach include instant switching capabilities and independence from network infrastructure, which can fail due to network issues. Cons include installation complexity and the high cost of SDI solutions.

4. Backup vMix Machines

Some users use a second vMix machine as a hot or warm backup. Depending on the setup, this second machine can either be on standby or even run in sync with the primary one. The advantage here is the quick switchover to a backup system, minimizing downtime in the event of a main machine failure. However, drawbacks include synchronization challenges and the complexity of managing both devices simultaneously, as well as the need to ensure equal conditions, such as network connections, power sources, and video sources.

5. Hardware Encoders and Decoders

Some users note that hardware solutions like Magewell Pro Convert and BlackMagic Hyperdeck provide reliable options for recording and transcoding streams without needing vMix. The benefit of this approach is independence from software and Windows, which reduces the likelihood of a complete system failure. However, drawbacks include the cost and limited flexibility of hardware solutions, as they offer fewer customization and configuration options than software solutions.

6. Multiple Computers or Laptops on Standby

Many operators consider having a laptop with vMix installed as a backup device. The advantages include portability and the ability to use it as a fallback in case the main computer fails, which is particularly useful for mobile setups where a large server machine is not always convenient. However, disadvantages include the limited processing power of laptops compared to a full workstation.

7. Network Infrastructure and Backup Equipment

When it comes to multi-channel recording via NDI, ensuring a robust network infrastructure is essential. This includes dedicated switches (such as the Netgear M4250) and backup power sources. The advantage of this approach is the ability to maintain stable connections for all channels and minimize the risk of failure due to network issues. Drawbacks include the high cost of equipment and the need for a professional approach to network design, which is not always available for smaller projects.

8. Additional Recommendations for Windows Configuration

Some users emphasize that for increased stability, it’s essential to disable Windows updates during recording and to test the system in advance. Pros include reduced likelihood of crashes related to updates, while cons include potential security issues due to outdated OS versions.

Conclusion

Each redundancy setup in vMix has its strengths and weaknesses. Depending on budget, available equipment, and project requirements, each operator can select the most suitable method—from simple solutions like external recorders to complex architectures with SDI matrices and backup NDI channels. Choosing the right configuration directly impacts workflow stability and the ability to quickly restore functionality in case of failures.