Once you’ve harvested your audio or video off the internet using the freeware Screen Capturer and Recorder, you’re going to want to do something with it. Another great freeware solution for this task is ffmpeg. Ffmpeg is a command-line utility that does just about everything with video and audio files that you’d ever want to do, but it is a bit cryptic at times.
What I wanted to do most recently was to normalize the audio in my files so that I wasn’t constantly messing with the volume during playback. I wasn’t always super careful when setting the audio level during capture, so being able to do it with ffmpeg was great. The problem was I only knew how to do one file at a time.