Convert RMI to 3GP — Free Online Converter
Convert RIFF MIDI (.rmi) to 3GPP Multimedia (.3gp) 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 .3gp file when it's ready.
About RMI to 3GP Conversion
RMI (RIFF MIDI) is a Microsoft-specific variant of the Standard MIDI File format that wraps MIDI performance data inside a RIFF (Resource Interchange File Format) container — the same container family used by WAV audio and AVI video files. Introduced with Windows 3.1, the .rmi extension was used by the Windows Multimedia Extension (MME) APIs and DirectX audio subsystems. The RIFF wrapper adds structured metadata chunks (DISP for display name, INFO for copyright and artist) that standard .mid files cannot carry natively.
3GP is a lightweight mobile multimedia container standardized by the 3rd Generation Partnership Project. Converting RMI to 3GP requires stripping the RIFF envelope, extracting the enclosed MIDI data stream, synthesizing it through a software synthesizer, and encoding the rendered audio into 3GP with a mobile-appropriate codec. This bridges content from the Windows MME ecosystem to mobile phone playback.
Why Convert RMI to 3GP?
RMI files are recognized exclusively by Windows multimedia subsystems — the MME waveOut/midiOut APIs and legacy DirectMusic components. No mobile operating system, whether iOS or Android, includes a RIFF MIDI parser. The format is invisible outside the Windows desktop environment, making conversion mandatory for any cross-platform distribution.
Converting to 3GP targets the broadest range of mobile handsets, including older feature phones that lack support for modern containers. For organizations migrating legacy Windows kiosk or point-of-sale audio content to mobile delivery channels, 3GP provides the most compatible target format for rendered RIFF MIDI audio.
Common Use Cases
- Migrating Windows kiosk notification sounds from RMI to mobile-playable 3GP format
- Converting DirectMusic game soundtracks stored as RMI for playback on feature phones
- Extracting audio from Windows CE device RMI files for delivery via MMS messaging
- Rescuing RMI ringtones from legacy Windows Mobile devices to modern mobile formats
- Preparing Windows embedded system alert sounds for mobile field technician devices
How It Works
FFmpeg detects the RIFF container header (RIFF....RMID) and extracts the enclosed MIDI data chunk. The standard MIDI event stream is then processed through a software synthesizer loaded with a General MIDI SoundFont. The synthesizer renders note events, program changes, and controller messages to PCM audio. This PCM stream is downsampled if necessary and encoded as AAC-LC or AMR-NB within a 3GP container conforming to 3GPP TS 26.244. Any RIFF INFO metadata (INAM, IART, ICOP) is discarded during conversion as 3GP does not support RIFF-style metadata chunks.
Quality & Performance
The RIFF wrapper itself has no effect on audio quality — the enclosed MIDI data is identical to a standard .mid file. However, RMI files sometimes reference a preferred SoundFont or patch set via RIFF metadata, and this preference is lost during conversion. The synthesizer used by FFmpeg applies its own SoundFont, which may produce different timbres than the Windows MME synthesizer (Microsoft GS Wavetable Synth) that originally played the RMI. AMR encoding in 3GP further limits fidelity to 300-3400 Hz; AAC-LC at 48-64 kbps preserves more of the synthesized spectrum.
Device Compatibility
| Device | RMI | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| 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 AAC-LC at 48 kbps minimum within 3GP for musical content — AMR-NB is speech-optimized and destroys musical frequencies above 3.4 kHz
- 2Check whether the RMI file references a specific patch set in its RIFF metadata before converting — you may want to match that SoundFont for authentic playback
- 3Test the rendered output against playback from Windows Media Player to compare synthesis quality before batch converting legacy RMI collections
- 4Strip the RIFF wrapper manually (extract the 'data' chunk) if you need the raw MIDI data for editing before conversion
- 5Verify the target mobile device supports 3GP playback — modern smartphones may prefer M4A or MP3 over the legacy 3GP container
RMI to 3GP extracts MIDI from its Windows RIFF container and renders it as mobile audio. This conversion is essential when legacy Windows multimedia content must reach mobile users.