Particularly intensive is the process of rendering your finished product into a standard video file that will by playable on the target device of choice, be that an HDTV, a laptop, or a smartphone. Most of the software can take advantage of your computer's graphics processor to speed this up. Be sure to check the performance section in each review linked here to see how speedy or slow the application is. In rendering speed testing, CyberLink and Pinnacle have been my perennial champs.
Signal Private Messenger is one of the most popular privacy chat apps. It features end-to-end encryption for all messages, voice calls, and video chats between two Signal users. It focuses a lot on individual chats. There are group chat features, but it's mostly for personal use. This is one of the biggest differences between it and rival privacy chat app Telegram. Video calls worked fine in our testing so we have no trouble recommending them. It's a neat way to get some encrypted chats as well. The app is also completely free and open source. You can't really go wrong with it, but there are better video chat apps if you need group video chats.