Convert MIDI to MKV — Free Online Converter

MIDI (.midi) provides a universal, text-like representation of music that any compatible system can interpret and render. This abstraction has made .midi the de facto format for procedural music systems in games (where the engine dynamically layers and transitions MIDI tracks based on gameplay state), for generative art installations (where algorithms compose MIDI in real time), and for academic music AI research (where neural networks output .midi for evaluation).

MKV (Matroska Video) is the most flexible multimedia container in existence — an open-source, extensible format capable of holding any combination of video, audio, subtitle, and attachment streams with rich metadata. Converting MIDI to MKV renders the synthesized audio into a container that supports advanced features like chapter markers, multiple audio tracks, and embedded fonts, making it ideal for complex multimedia packaging of MIDI-derived content.

Multimedia artists creating installations or interactive experiences often combine MIDI-rendered audio with generated video, data visualizations, or algorithmic animations. MKV's ability to hold multiple audio tracks, subtitle streams for lyrics or annotations, and chapter markers for sections makes it the ideal container for packaging these complex MIDI-based multimedia works.

Media server operators running Plex, Jellyfin, or Kodi can organize MIDI-rendered music albums as MKV files with chapter markers per track, embedded album artwork as attachments, and multiple audio renderings (different SoundFonts) as alternate audio tracks — all in a single file. This provides a richer library experience than individual audio files.

FFmpeg synthesizes the .midi event stream through a SoundFont engine to produce stereo PCM audio. The PCM is encoded using any of Matroska's supported codecs — FLAC for lossless, Opus for efficient lossy, AAC for Apple compatibility, or Vorbis for open-source purity. The encoded audio is muxed into Matroska's EBML container with a Segment element containing: SeekHead (index), Info (duration, title, date), Tracks (audio codec parameters, sample rate, channels), Chapters (optional time-based navigation), Tags (metadata in a nested tag structure), and Clusters (the actual encoded audio frames with timestamps).