One of the most common problems which a user finds while cropping a video in VLC is that their videos are not saved after the cropping process. The basic cropping feature of VLC is only for the previewing purpose. So, if you wish to save your cropped videos permanently, ensure to tick the checkbox next to Video Cropping Filter (as mentioned in the steps of VLC above) after the conversion process is complete. If you do not tick this checkbox, your videos will not be saved.