Convert AIFC to MKV — Free Online Converter

AIFC (AIFF-C) is Apple's legacy compressed audio format supporting IMA ADPCM, MACE 3:1/6:1, G.711, and uncompressed PCM. MKV (Matroska Video) is an open-source multimedia container with exceptional flexibility — it can hold virtually any audio, video, and subtitle codec combination. Matroska was designed with future-proofing in mind, supporting features like chapters, multiple audio tracks, and embedded fonts.

Converting AIFC to MKV produces an audio-only MKV file — the AIFC audio is decoded and re-encoded (or stream-copied as PCM) into the Matroska container without a video track. This is useful for audio workflows that leverage MKV's advanced features like chapter markers and multiple embedded audio streams.

MKV's container flexibility makes it valuable for audio projects that need features unavailable in simpler audio containers. Multiple audio tracks (e.g., different languages or commentary), chapter markers, and custom metadata can all be embedded in a single MKV file. AIFC offers none of these capabilities.

MKV is also universally supported on Linux, Android, and cross-platform media players like VLC and mpv. AIFC has essentially zero support outside of legacy Mac OS. For complex audio projects or multi-platform delivery, MKV provides a modern, open-source container that any competent media player can handle.

FFmpeg decodes the AIFC container to raw PCM samples, then either stream-copies as PCM (lossless) or encodes to FLAC, AAC, Opus, or Vorbis within the MKV container. Matroska supports virtually any audio codec, so the choice depends on the use case. Chapter metadata can be added via an external chapters file. The MKV container uses variable-length integer encoding (EBML) for efficient storage and supports CRC-32 integrity checking on element clusters.