I’ve spent a large portion of the past month working with ffmpeg. We are using it to repair, concat, and mux an arbitrary number of overlapping audio and video streams recorded via WebRTC. While this sounds straight forward on the face of it, the interplay of filters and controls is impossible to predict without extensive experience.
To my knowledge ffmpeg is the only tool that could possibly do this. It took a whole lot of reading man pages, bug trackers, stack exchange and various online sources to stitch together the necessary info. This seems like a great resource to learn what the tool is really doing and skip scrambling for information so much.