Is there a way to check whether a video was present at a particular given time?

I want to export a video and I have also referred both the video export samples from the SDK.

What I require is to validate whether the video was present at that particular period of time.

If the video was present I will export it or else I will carry some other action.

Please note that I am using XProtect Corporate.

A way to check if there is images: Use JpegVideoSource, ask for an image at the end time of the period you examine using

override object VideoOS.Platform.Data.JPEGVideoSource.GetAtOrBefore (DateTime dateTime )

if you get no image, or the image you get is older than the begin time of the period you examine, there is no images in the period.

Thanks a lot.