USB Capture HDMI Latency Test

Testing environment

• CPU: Intel Xeon E5-1620 v3
  
• RAM: 8GB RAM
  
• OS: windows 10 64-bit

Testing method

The video source is the Macbook. It outputs via HDMI to a splitter. The Output 1 port of the splitter is connected to a monitor and Output 2 is connected with a USB Capture HDMI. The dongle captures the video and feeds to the Macbook via USB 3.0. The capture software is Capture Express V2.1 developed by Magewell. A stopwatch application developed by Magewell is running on the Macbook. The smallest unit it can measure is 0.001 second, which is 1 ms. The original and captured video are displayed on the monitor. See the picture below. Screenshots are made and calculation is done according to the data on the screenshots. The same test is done for 6 times to get 6 results in order to be more accurate.

Causes of Error

• The operation of screenshots
  
• The latency is very small, which is measured by milli-seconds.
  
• The processing latency of all the connected hardware

Result Record

Conclusion

Please refer to the minimal value. Considering the error, the actual capture latency should be less than the minimal value.