What do you think of the Any Video Converter Ultimate for Mac you are using? A converter? It is a versatile converter. But if you want it to be a downloader, then it is a 20-website downloader; you want it a screen recorder, then it saves your screen movements into video; you want a video editor, then it edits videos. That is video converter, and that is Any Video Converter Ultimate for Mac.
Here is a tutorial about editing videos of how to merging, unmerging and converting videos.