Convert RMI to AVI — Free Online Converter
Convert RIFF MIDI (.rmi) to Audio Video Interleave (.avi) 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 .avi file when it's ready.
About RMI to AVI Conversion
RMI (RIFF MIDI) and AVI (Audio Video Interleave) share the same RIFF container lineage — both use Microsoft's Resource Interchange File Format as their structural foundation. RMI was designed for the Windows Multimedia Extensions to store MIDI performance data with RIFF metadata, while AVI was designed for interleaved audio and video streams. Converting between these two RIFF-family formats extracts the MIDI data from the RMI container, synthesizes audio, and repackages it into the AVI container.
This conversion produces an audio-only AVI file containing the rendered MIDI performance. Since both formats belong to the RIFF family, the output integrates naturally with legacy Windows multimedia applications, DirectShow filter graphs, and Windows Media Player. The primary use case is compatibility with legacy Windows software that accepts only AVI input for multimedia content.
Why Convert RMI to AVI?
Legacy Windows multimedia applications — video editors, presentation tools, DirectShow-based players, and Windows Media Encoder — often accept only AVI files as input. If rendered MIDI music from an RMI source must be integrated into these pipelines, packaging it in the sibling AVI RIFF container provides seamless compatibility within the same Windows multimedia framework.
AVI also serves as a soundtrack placeholder in Windows-based video editing workflows. Rendered RMI audio in an AVI container can be placed on a timeline in legacy video editors like Windows Movie Maker or VirtualDub, alongside video streams, without format conversion within the editing application.
Common Use Cases
- Providing rendered RMI soundtrack audio as AVI for legacy Windows Movie Maker projects
- Integrating MIDI-rendered kiosk music into DirectShow filter graphs that require AVI input
- Creating audio-only AVI files from Windows system RMI sounds for VirtualDub processing
- Preparing Windows multimedia training content for legacy video editing software requiring AVI format
- Embedding synthesized RMI audio as placeholder tracks in AVI-based corporate video projects
How It Works
FFmpeg reads the source RMI file's RIFF header, identifies the RMID form type, and extracts the MIDI data chunk. The MIDI event stream is synthesized through a SoundFont-based engine to produce stereo PCM audio. Since both source and target are RIFF-family containers, the output reuses the RIFF structural paradigm — AVI wraps the audio stream with AVI-specific headers (hdrl, strl, movi chunks) and an index (idx1) for seekability. Audio is encoded as PCM (uncompressed) or MP3 within the AVI container.
Quality & Performance
Quality depends on the SoundFont and audio codec choice, not the container. Both RMI and AVI are RIFF containers that impose no quality constraints on their payload data. PCM audio in AVI preserves the full synthesis output without compression. MP3 encoding within AVI applies standard lossy compression. The SoundFont determines the musical result — the Microsoft GS Wavetable Synth character that RMI files were designed for may differ from third-party SoundFont timbres.
Device Compatibility
| Device | RMI | AVI |
|---|---|---|
| Windows PC | Partial | Native |
| 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
- 1Use PCM audio encoding within AVI for maximum compatibility with legacy Windows applications and DirectShow filters
- 2Consider WAV instead of AVI for audio-only output — both are RIFF containers but WAV is simpler and more widely recognized for audio
- 3Test the audio-only AVI in your target application before batch converting — some legacy editors expect a video stream in AVI files
- 4Use a SoundFont that matches the Microsoft GS Wavetable Synth character for authentic reproduction of how the RMI sounded on Windows
- 5Embed RIFF INFO metadata (title, artist) in the AVI output to preserve attribution from the source RMI file's metadata chunks
RMI to AVI converts between two RIFF-family containers, rendering MIDI to audio in the process. This conversion serves legacy Windows multimedia workflows that require AVI input.