How to synchronize the data from camera and eye tracker?

[Kihensarn]

Hi, @swook . I use OpenCV to capture the frames, what borthers me is that I don't know how to attach a timestamp to each frame and ensure the interval of each timestamp nearly the same. By using the datetime.time(), I can get the current time and regard it as the timestamp, but the interval between each of the timestamps seems to be different and has a big gap. So could you share me some details about your method which is used to synchronize the data?Or It would be very nice if you can share the source code or your method with me. Thanks.