The Building Blocks of Audio: Understanding the Difference Between Audio Formats, File Formats, and Codecs

Talking about MP3, WAV or Dolby Atmos may sound simple, but behind these terms are three different concepts that are often confused: audio format, file format and codec. To understand how sound is created, stored and distributed, it’s important to clarify the differences. This article guides you through the basics, shows how these concepts connect, and explains why it’s especially important when working with advanced sound systems like Dolby Atmos.
If you want to read more about Dolby Atmos, check out some of our other articles on the topic below:

• What is Dolby Atmos?
• Mixing in Dolby Atmos: Workflow from Start to Finish
• Exporting Master Files from Atmos Projects in Logic Pro

Audio Format – The Experience Itself

The audio format describes how sound is organized and how we experience it. It involves the number of channels, their placement, and how sound objects move through space. Examples include mono (1 channel), stereo (2 channels), 5.1 or 7.1 surround, and object-based systems like Dolby Atmos. (An audio object is an individual sound source – for example a voice, an instrument, or a background sound – that can be freely positioned within a 3D space.)

Examples of audio formats:

• Mono: One channel – all sound comes from the same point.

• Stereo: Two channels – left and right.

• 5.1 / 7.1 Surround: Multiple channels – immersive sound.

• Dolby Atmos: Object-based 3D sound – each sound object can be freely placed in the room.

To make it clearer, think of a meal as a metaphor for the listening experience in relation to audio format, file format, and codec. In that analogy, the audio format is like the cutlery – it determines how the sound is “consumed.” Just as a fork, spoon, or chopsticks affect how you eat, the audio format defines how sound reaches your ears: from one point (mono), from two directions (stereo), or all around you (surround and Atmos).

File Format – The Container That Holds the Sound

The file format is the “box” that stores the sound. It’s the file extension we see on the computer – for example .wav, .mp3, .flac or .mp4 – and it determines how programs and systems interpret the file’s contents. The file format also defines which metadata can be stored, such as title, artist and timecode.

Examples of file formats, contents and metadata:

In our meal metaphor, the file format can be compared to the plate. It holds the food in place, makes it possible to serve and move it, but doesn’t affect the taste. In the same way, the file format is the container that holds the audio and its metadata without changing how it sounds.

When Codec, File Format and Audio Format Meet in Practice

In a Dolby Atmos production, the audio format (the cutlery) defines how the audio objects – that is, each individual sound in the room – are placed and move. During production, the sound is often stored in a BWF-ADM file (the plate) with uncompressed PCM. When the music is later streamed to the listener, a codec (the cooking method) such as AC-4 or E-AC-3 within an MP4 container is used. This makes the sound more compact without losing the experience.

It’s easy to confuse codec and file format, since some – like MP3 – share the same name for both codec and file type. In other cases, they differ completely: a codec such as AC-3 may appear in several different containers (like .mp4 or .vob), even though the file extension doesn’t reveal which codec is actually used. This often causes confusion, especially when sharing or distributing files across different systems.

Examples of codec ≠ file format/container:

This shows why it’s crucial to separate these concepts: the audio format defines the experience, the file format packages the sound, and the codec determines how it’s processed and played back.

Final Thoughts

By distinguishing between audio format, file format and codec, both producers and listeners can better understand the building blocks of sound technology. The audio format defines the experience, the file format handles storage and transport, and the codec manages compression when needed. At KMR Studios, we work with these concepts every day. If you’re interested in learning more about them or want help with music production, mixing or mastering, you can always reach out to us directly!

Latest Articles

CONTACT US

WRITE MESSAGE

NAME *

EMAIL *

PHONE *0 / 10

GDPR *

I consent to this website storing my submitted information so that they can respond to my inquiry, and I agree to the privacy policy and terms and conditions.

Send message

Please do not fill in this field.

OUR PORTFOLIO

Over the past few years, KMR Studios has released hundreds of songs by a wide range of artists. To make it easier for you to find what you’re looking for, we’ve organized the music into various playlists. Click the link below to explore our music by format (stereo or Dolby Atmos) or genre.

Portfolio