Free online MKV to MID converter

Programs that work with musical notation or synthesizers may require a MIDI file instead of an MKV video container. This conversion is not a normal container change: the MKV’s soundtrack must be analyzed and transcribed into MIDI note data.

What the MKV format is

MKV, or Matroska Video, is a multimedia container that can hold video, multiple audio tracks, subtitles, chapters, metadata, and attachments. Media players such as VLC, MPC-HC, and mpv commonly open MKV files; screen recorders, video editors, streaming tools, and cameras may create them.

An MKV does not normally contain MIDI notes. Its audio stream may be AAC, Opus, AC-3, FLAC, or another codec, so the first step is usually extracting that stream.

What the MID format is

MID is the filename extension commonly used for a Standard MIDI File. MIDI stores performance instructions such as note numbers, timing, velocity, tempo, channels, and instrument-program assignments; it does not store recorded sound.

MIDI files are useful for notation software, sequencers, synthesizers, DAWs, and systems that need editable notes. They are usually very small, but playback depends on the selected synthesizer or sound bank. A MIDI transcription therefore will not reproduce the original MKV soundtrack exactly.

How to actually convert MKV to MID

Online conversion

You can try the free converter on 101convert.com without installing software: upload the MKV, select MID as the output format, start the conversion, and download the result. This works only when the converter provides audio-to-MIDI transcription; simple file remuxing cannot create musical notes from an MKV soundtrack.

Desktop workflow with FFmpeg and Basic Pitch

1. Inspect the streams with ffprobe input.mkv and identify an audio stream containing the music.
2. Extract the first audio stream as an uncompressed WAV file: ffmpeg -i input.mkv -map 0:a:0 -vn -ac 1 -ar 44100 extracted.wav. Replace 0:a:0 if the required track has a different index.
3. Install Spotify’s open-source Basic Pitch transcription tool in a Python environment: pip install basic-pitch.
4. Transcribe the WAV file: basic-pitch midi-output extracted.wav. The output directory should contain a generated .mid file and, depending on the version, analysis files.
5. Open the MIDI in a DAW or notation program and correct wrong pitches, note lengths, tempo, and instrument assignments.

For a melody recorded with little background sound, Basic Pitch can produce a usable starting point. Melodyne, Ableton Live, and specialized audio-to-MIDI tools provide alternative transcription workflows and manual correction controls.

Quality and compatibility limitations

If the MKV has no audio stream, there is nothing to transcribe. Speech, crowd noise, heavy effects, reverb, distorted guitars, and dense arrangements reduce note-detection accuracy. Polyphonic transcription may merge overlapping instruments or produce extra notes; percussion is especially difficult because MIDI drums require channel and note mapping.

Use the original highest-quality audio stream when possible. Converting a compressed soundtrack to WAV before transcription does not restore lost detail, but it gives the analysis software a compatible working file. MIDI timing, tempo, pitch, and velocity often need editing after conversion, and the resulting file will reproduce only detected musical events, not the original voices or sound design.