VideoSplit
VideoSplit[video, t] splits video at time t.
VideoSplit[video, {t1, t2, ...}]splits video at times ti.
Examples
Split a video at 5 seconds:
VideoSplit[Video["ExampleData/sampleVideo.mp4"], Quantity[5, "Seconds"]]Split at multiple time points:
VideoSplit[video, {Quantity[2, "Seconds"], Quantity[5, "Seconds"]}]Please visit the official Wolfram Language Reference for more details.