Convert RMI to MKV — Free Online Converter
Convert RIFF MIDI (.rmi) 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 .rmi 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 RMI to MKV Conversion
RMI (RIFF MIDI) uses Microsoft's RIFF binary container to encapsulate Standard MIDI File data, providing structured metadata storage and integration with Windows multimedia APIs. The format was central to DirectMusic, Microsoft's interactive audio framework for games, which loaded RMI files through the IDirectMusicLoader interface and processed them through the DirectMusic synthesizer with custom DLS (Downloadable Sounds) instrument banks.
MKV (Matroska Video) is a flexible open-source multimedia container based on EBML (Extensible Binary Meta Language), capable of holding virtually unlimited audio, video, and subtitle streams. Converting RMI to MKV extracts MIDI from the Windows RIFF container, synthesizes audio, and packages it in Matroska's versatile structure. The output is an audio-only MKV suitable for multimedia projects and media server libraries.
Why Convert RMI to MKV?
MKV's flexibility makes it valuable when rendered RMI audio needs to be combined with other media streams in post-production. Video editors can add video tracks to an existing MKV audio file, and subtitle tracks can be muxed alongside. For multimedia projects that incorporate legacy Windows MIDI content, MKV provides a modern container that supports any audio codec and arbitrary metadata.
MKV is the preferred container for media server applications like Plex, Jellyfin, and Kodi. Converting RMI to MKV with proper metadata tagging integrates rendered Windows MIDI audio into these media management platforms alongside other content in a consistent container format.
Common Use Cases
- Preparing DirectMusic game soundtrack RMI files as MKV audio for later video muxing in game trailers
- Creating MKV audio files from Windows kiosk RMI content for Plex or Jellyfin media server libraries
- Building multimedia project audio foundations from legacy Windows RMI compositions with chapter markers
- Converting Windows-era educational RMI content for integration into MKV-based e-learning video packages
- Generating chaptered audio MKV files from multi-section Windows MIDI compositions stored as RMI
How It Works
FFmpeg reads the RIFF container, validates the RMID form type, and extracts the MIDI data. The MIDI event stream is synthesized to stereo PCM, then encoded using any codec Matroska supports — typically FLAC (lossless), Opus (high-quality lossy), Vorbis, or AAC. The encoded audio is wrapped in Matroska's EBML structure with track header elements, codec identification, timestamp scaling, and optional chapter and tag elements for content organization.
Quality & Performance
MKV is a transparent container — audio quality depends entirely on the chosen audio codec. FLAC in MKV provides bit-perfect lossless preservation. Opus at 128 kbps delivers excellent lossy quality that outperforms MP3 and AAC at equivalent bitrates. The SoundFont determines the musical result from MIDI synthesis; MKV adds no degradation beyond the chosen codec's characteristics.
Device Compatibility
| Device | RMI | 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 from RMI files
- 2Add chapter markers in the MKV if the RMI composition has distinct sections or movements for easy navigation
- 3Use FLAC encoding inside MKV if the audio will be extracted later for further production work or remixing
- 4Tag the MKV with proper title and artist metadata — transfer attribution from the RMI's RIFF INFO chunks
- 5Consider a pure audio format (FLAC, M4A, OGG) unless you specifically need MKV's multimedia container capabilities
RMI to MKV renders Windows RIFF MIDI content into a versatile multimedia container. MKV is ideal when the audio will be combined with video, chaptered, or served through media server infrastructure.