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.

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Causes of Error

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

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Result Record

source format	latency(ms)						minimal value
	1	2	3	4	5	6
1080p@60pHz	79	78	47	63	60	63	47
1080p@50pHz	62	78	109	93	62	62	62
640x480@60pHz	78	110	46	78	62	91	46
720x480@60pHz	108	81	62	94	78	62	62
720x576@50pHz	62	125	108	79	78	94	62
720x576@60pHz	78	78	63	79	92	62	62
800x600@60pHz	47	94	78	78	78	72	47
1024x768@60pHz	110	94	62	62	78	77	62
1152x864@60pHz	110	109	62	79	94	94	62
1280x768@60pHz	78	78	78	94	78	78	78
1280x800@60pHz	125	109	62	62	125	109	62
1280x960@60pHz	94	63	94	94	78	109	63
1280x1024@60pHz	79	109	109	62	31	63	31
1440x900@60pHz	62	46	78	78	110	63	46
1600x900@60pHz	62	63	63	63	94	63	62
1680x1050@60pHz	94	110	46	94	78	63	46
1080i@30iHz	74	60	124	90	78	78	60
720p@50pHz	78	78	63	78	108	63	63
648p@50pHz	125	109	63	94	63	79	63

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Conclusion

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