Convert MID to MKV — Free Online Converter
Convert Standard MIDI (.mid) to Matroska Video (.mkv) online for free. Fast, secure audio conversion with no watermarks or registration....
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How to Convert
Upload your .mid file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
About MID to MKV Conversion
MID (Standard MIDI File) is a musical notation format that records performance data — notes, velocities, timing, instrument selections — without storing any audio. Created by the MIDI Manufacturers Association in 1983, the format is universally used for electronic music sequencing. MIDI files are remarkably small (10-100 KB) because they encode instructions rather than sound waveforms.
MKV (Matroska Video) is a flexible open-source multimedia container capable of holding virtually unlimited audio, video, and subtitle streams. Converting MID to MKV renders the MIDI performance through a software synthesizer and packages the resulting audio into an MKV container. The output is an audio-only MKV file, leveraging Matroska's excellent codec support and metadata capabilities.
Why Convert MID to MKV?
MKV's flexibility makes it useful when the rendered MIDI audio needs to be combined with other media streams later. Video editors can add video tracks to an existing MKV audio file, and subtitle tracks can be muxed alongside. This is valuable for multimedia projects where MIDI provides the soundtrack foundation.
MKV also supports chapter markers, allowing long MIDI compositions to be segmented into navigable sections. For multi-movement MIDI works or medleys, MKV chapters provide structure that pure audio formats like MP3 or FLAC cannot match. MKV is natively supported by VLC, MPV, and most Linux media players.
Common Use Cases
- Creating audio-only MKV files from MIDI soundtracks for later video muxing
- Preparing MIDI-rendered audio with chapter markers for multi-section compositions
- Building multimedia project foundations where MIDI audio will be combined with video
- Converting MIDI compositions for inclusion in MKV-based media libraries
- Generating audio tracks from MIDI for Kodi or Plex media server libraries that prefer MKV
How It Works
FFmpeg processes the MIDI file through its built-in decoder and software synthesizer, generating stereo PCM from the MIDI event stream. The PCM audio is then encoded using any codec MKV supports — typically FLAC (lossless), Opus (lossy, high quality), Vorbis, or AAC. The encoded audio is wrapped in Matroska's EBML (Extensible Binary Meta Language) container structure with proper track headers, codec information, and optional chapter and tag elements.
Quality & Performance
MKV is a container — audio quality depends on the codec chosen for the audio stream. FLAC in MKV provides bit-perfect lossless preservation. Opus at 128 kbps delivers excellent lossy quality. As with all MIDI conversions, the true quality determinant is the SoundFont and synthesizer used for rendering. MKV adds no degradation beyond the chosen audio codec's characteristics.
Device Compatibility
| Device | MID | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Choose Opus encoding inside MKV for the best quality-to-size ratio on synthesized MIDI audio
- 2Add chapter markers to the MKV if the MIDI composition has distinct sections or movements
- 3Use FLAC encoding inside MKV if the audio will be extracted later for further production work
- 4Consider a pure audio format (FLAC, M4A) unless you specifically need MKV's multimedia capabilities
- 5Tag the MKV with proper title and artist metadata for media library integration
MID to MKV renders MIDI into a versatile multimedia container ideal for projects where the audio will be combined with video or chaptered for navigation.