Which Audio Codecs Can Be Embedded in MKV?

The Matroska (MKV) container is renowned for its incredible flexibility, allowing it to hold an unmatched variety of video, audio, picture, and subtitle tracks in a single file. This article provides a direct overview of the audio codecs compatible with the MKV format, ranging from standard lossy formats used in streaming to high-definition lossless formats preferred by audiophiles and home theater enthusiasts.

Supported Lossy Audio Codecs

Lossy audio codecs compress audio by removing data that is difficult for the human ear to hear, resulting in smaller file sizes. MKV fully supports the most common lossy formats:

• AAC (Advanced Audio Coding): The standard for modern digital audio, widely used in streaming and compatible with almost all devices.
• MP3 (MPEG-1 Audio Layer III): A legacy format that remains supported for backward compatibility.
• AC-3 (Dolby Digital): The classic surround sound format used in DVDs and digital television.
• E-AC-3 (Dolby Digital Plus): An advanced version of Dolby Digital offering better compression and support for more channels, commonly used by streaming services.
• DTS (Digital Theater Systems): A popular multi-channel audio format used primarily in home theater setups and physical media.
• Opus: A highly efficient, open-source codec developed by the Xiph.Org Foundation, ideal for interactive speech and music transmission over the internet.
• Vorbis: An older, open-source predecessor to Opus, still widely supported in MKV containers.

Supported Lossless Audio Codecs

Lossless audio codecs compress audio without discarding any data, offering bit-for-bit accuracy to the original source. MKV is highly favored for its ability to store these high-quality formats:

• FLAC (Free Lossless Audio Codec): The most popular open-source lossless format, perfect for preserving high-fidelity stereo or multi-channel audio.
• Dolby TrueHD: An advanced lossless codec used on Blu-ray discs that delivers up to eight channels of discrete audio, often carrying object-based Dolby Atmos metadata.
• DTS-HD Master Audio (DTS-HD MA): A lossless format that serves as the primary competitor to Dolby TrueHD, commonly found on physical media.
• ALAC (Apple Lossless Audio Codec): Apple’s proprietary lossless audio codec, which can be safely remuxed into MKV.
• PCM / LPCM (Linear Pulse-Code Modulation): Uncompressed audio that offers the rawest form of digital sound, though it results in very large file sizes.

Because Matroska is an open-standard container designed to be future-proof, virtually any audio codec can be wrapped inside an MKV file, making it the most versatile media container available today.