After installing Format Factory on your computer, open the tool.
Step 2: On the Format Factory interface, select the Video Joiner & Mux feature
Step 3: The Video Joiner & Mux dialog box opens, click Add files to add the videos to join
After selecting the videos that need to be merged -> click OK to return to the main interface.
Step 4: Click Start on the toolbar to start the video merging process
That's it, after successfully merging the Video with Format Factory , you just need to log in to the folder containing the output Video, use the Video viewing software available on your computer to watch these Videos.