There are some flowing reason of the video of dash cam play tardily .we can solve it in the following way when we get suck.
Please check whether the dash cam cable to the computer or use video card reader wiring the computer to play video.because the USB of the computer is usually 2.0, more data is often a second more than one million. but the video recorder to record file, usually a second two million so that it will play taradily. In order to paly normally, you can copy the video to computer hard.
Besides, due to the incompatibility of some players, it can be solved by trying several players.