Capture · Record · Stream · Encode · DecodeCapture · Record · Stream · Encode · DecodeThe delay you see when capturing over USB comes mostly from the software on the computer, not from the capture device. No single latency figure applies to a Magewell USB Capture device, because the total depends on the capture format, the software's buffering and what the computer is doing with the picture. The practical rule is simple: use the captured picture for recording and streaming, and use a loop-through output or a separate monitor feed when someone needs to watch the source live.
The picture passes through several stages, and each adds some delay: the capture device, the USB transfer, the buffer in the capture software, any scaling or effects, and the preview on screen. In conferencing software such as Zoom or Teams, encoding and the network add more, and usually far more than the capture stage does. Measure your own setup if the figure matters: point the camera at a running stopwatch, photograph the source and the preview together, and compare the two readings.
Choose a YUV capture format such as YUY2 in place of RGB. It carries less data per frame, so there is less to move over USB and less for the software to process. In OBS Studio, set Buffering to Disable in the Video Capture Device properties; OBS describes this as the setting to try when you see a delay on the device, while enabling it can help with stuttering. For a custom application, Magewell provides an SDK, and the devices work with DirectShow on Windows and V4L2 on Linux, so a developer can read frames directly without a general-purpose application in the way.
Delay and dropped frames increase when the USB connection cannot carry the video. Connect the device to a USB 3.0 port with the supplied cable; on a USB 2.0 port there is much less bandwidth for video. Several capture devices on one USB controller share its bandwidth, even when they are plugged into different ports, so spread them across controllers where you can. For live monitoring without the software delay, choose a model with a loop-through output: the USB Capture HDMI Plus, USB Capture HDMI 4K Plus, USB Capture HDMI 4K Pro and USB Capture SDI Plus all have one. In Windows, Device Manager → Universal Serial Bus controllers shows the controllers fitted to the computer.
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There is no single figure, because most of the delay comes from the software and computer that receive the video, not from the device. Expect the captured picture to run slightly behind the source. For live monitoring, use the loop-through output if your model has one.
Yes, for recording and streaming. Play on a display fed from the loop-through output, on models that have one, because that signal does not pass through the computer. Do not play from the preview in your capture software: it runs behind the source and will affect your reaction time.
Turn off buffering for the capture source in your software, choose a YUV capture format in place of RGB, connect to a USB 3.0 port with the supplied cable, avoid sharing the USB controller with other busy devices, and make sure the computer can handle your chosen resolution and frame rate.
There is no single latency figure for USB Capture devices, and the total you see is set mainly by software buffering and the computer. The captured picture is well suited to recording, streaming and conferencing. Where the delay matters, measure it on your own system with a stopwatch test.
Monitor from the loop-through output where your model has one, not from the software preview. In OBS, set Buffering to Disable on the Video Capture Device source. Reducing the load on the computer, for example with a hardware encoder, also helps the preview keep up.
It is suitable for capturing and streaming gameplay, but not for playing from the software preview, which runs behind the source. Choose a model with loop-through, connect your display to that output for playing, and use the captured feed for the stream or recording.
USB 3.0 and USB 3.1 Gen 1 are two names for the same 5 Gbps connection, so there is no difference between them for capture. What matters is that the port is not USB 2.0, which has far less bandwidth, and that the capture device is not competing with other busy devices on the same controller.
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