
The subject can be an object or a person’s facial expression. If you want to induce humor into your video, you can zoom in on a subject that’s part of the joke you want to come across. You can use the zoom-in effect in many ways, but the speed of the zoom also matters. This will help you emphasize something funny, dramatic, or informative for the audience.

i video1.mp3 -i video2.mp4 -i video3.mp3 -i video4.You’ve finally finished recording a video, but something’s missing. The example below will take four input videos and arrange them on a 640x480 canvas (depending on the quality/size of your source you can scale them up appropriately). You can use something like ffmpeg to do that, and then play the result back in any player that supports the selected video format (Windows Media Player, iTunes, VLC etc)

If you want to have the four videos synchronized then rather than using a player to play each individually you would want to create a single output video with a mosaic with the four input videos. There are probably commercial apps to do that on a PC, or you could run a web app locally with a server on the PC and display content from your local machine. The sample below will create a mosaic, but not the interactivity you were looking for. ** Sorry, just re-read the question again and looked at the linked player.
