Any media file that has both video and audio needs to be encapsulated by a so-called “container format”. As an analogy, a video file with its corresponding audio file can be zipped together using WinZip or other utilities to create a single file – since we generally do not use two separate files for an audiovisual media file’s playing. However, WinZip or the other utilities are merely encapsulating tools that do not care much about the timing between the audio and the corresponding video – they
