The video files when recording my course are huge. How can I reduce the file size?

Here is an answer from our tech guru himself, Dave Kaminski: 

Video files are big, always. A 45-minute video, assuming it's HD (1920x1080), will typically be anywhere from 2.5GB to 5GB in size. That's just the nature of video files.

This is not a "Screenflow problem.” All video, produced from any video editing software, works the same way.

To reduce the file size of a video, you have to reduce the quality of the video. That means the video file size will be smaller, but it won't look as good.

There are a couple of ways to do this… or you can do both together.

First, you can reduce the "bit rate" or "data rate" of the video. By cutting this number in half, you'll typically cut the file size of the video in half… but again, the video quality will take a hit (and sometimes a major one).

Second, you can reduce the dimensions of the video. Instead of exporting a video at 1920x1080, export it at 1280x720. In this case, you're making the video smaller, which helps to reduce file size. You generally won't notice a difference in quality unless you watch the video at full screen.

But the bottom line is whether you're using Screenflow, Camtasia, Adobe Premiere, iMovie, or whatever... video file sizes will always be the same... and you have to reduce the quality of the video to get smaller file sizes. And even then, you're going to have big files.