Dropping QuickTime Recording from Stereo to Mono
If QuickTime exports a stereo recording with an empty right channel, you can use ffmpeg to easily copy the left channel to the right one, for a proper mono recording.
I wanted to figure out how to record both a Skype conversation and my mic in GarageBand, but keep them on separate tracks. None of the tutorials worked for me, so I'm posting the settings that did.