As the preview window showing on the right, you can also decide which part of the video to be converted. Generally speaking, we can edit the start time and end time to the video that is longer than 10 seconds. Now,Let's take an example about how to set the start time and end time to the video: Step1:Select the video.(Tips：Make sure it’s longer than 10 seconds）
Step2:Decide how many clips you want to divide the video into and choose the number from the drop-down list. 
As the picture shows; Now we choose"10".
Step3:You will see your video is divided into 10 clips,and then you can choose a clip and set the start time and end time to the video as you want.Make sure it's longer than 10 seconds.For example, If you want to crop the video from 00:39:00--00:45:00,you should choose cilp 6 and input the start time and end time in the blank. Finally please remove the clips that you do not need any more.
If you're interested in Yuzhe video converter program, please visit: Yuzhe Video Converter.