Values in the result page and the video are mismatching

I am running a test on webpage test (on the private instance) and creating its video and after that down downloading the same video, but I see there is a variance in the result page time and time showing in the video.

Please refer the screenshot attached.
If you can see the summary page took almost 2.5 seconds but in the video, it is showing 1.4 seconds. Not able to correlate it.