Digital sound is nothing more than numbers. What separates one container from another is how those numbers are packed, how much data (if any) is thrown away, and which devices understand the result.

There are a number of Linux commands that will display file system types along with the file system names, mount points and such. Some will also display sizes and available disk space. The df command ...

Usually, when you have a video file on your iPad or iPhone, the file can play on that device—why else would it be there? But occasionally you’ll run into a need to convert a video file, like I did ...