Tip on recording online presentations as videos
I like to record webinars and online presentations so I can watch them offline. I use SnagIt plus a free tool called Handbrake. I've been using Camtasia and SnagIt for years. I used Camtasia a lot for making screen recordings of presentations, but at one point they added that ability into SnagIt, which is a lot easier to use. It does some really basic editing as well. Something helpful to know about how video encoding work: It takes a screenshot and uses that as something called a "key frame" and saves it. Then it takes successive screenshots and computes the differences and saves them instead. For things like filming people and events live, or like what you'd see in a TV show, if the camera is still and there's motion in the scene limited to just a small part, then the differences between each frame are fairly small until the camera's angle changes, and you end up with a decent amount of compression. For online presentations, like most webinars these days, unless the person has their face in a little bubble, the screen doesn't change AT ALL for quite a while -- dozens if not hundreds of key frames -- which means there's NO CHANGE between the key frames. Even with a headshot in a bubble, the changes from frame to frame are minimal. I was on a webinar the other day and they had around two dozen slides and took an hour to go through them. SnagIt doesn't not optimize anything, and its videos end up quite bloated for this purpose. It tends to create videos that are around 15MB per minute, which isn't that unusual. So an hour long presentation can be around 1GB in length. Note that MP4 has a sound track attached to it that's usually encoded as MP3, and it's highly compressed already. The audio for an hour long presentation can be only 100k or less. So we're just talking about the VIDEO part of the file here. Anyway, most screen recording tools don't know what sort of thing they're dealing with, and they're tuned to do a good job for whatever you might throw at them.