2021-11-19 00:00:00 Merge four videos app is app to merge four videos to one video. The source of video can be the same video or different video. What is the function of this four video app? There are some function of this app: 1. We can compare four videos in one time shoot. Sometimes we want to compare and want to see what is different among four videos. With this merge four videos app we can do it simple and fast.