Convert RMI to iPad Audio — Free Online Converter
Convert RIFF MIDI (.rmi) to iPad Audio (.ipad-audio) 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 .m4a file when it's ready.
About RMI to iPad Audio Conversion
RMI (RIFF MIDI) is a Windows-specific container wrapping MIDI performance data in a RIFF structure with metadata chunks. iPad Audio is a device-optimized preset producing AAC or M4A files tuned for the Apple A-series and M-series chips present in iPad hardware. These processors include dedicated Apple-designed audio DSP blocks that provide hardware-accelerated AAC decoding with minimal power draw.
Converting RMI to iPad Audio synthesizes the enclosed MIDI data through a SoundFont engine, then encodes the resulting PCM to AAC-LC in an M4A container — the native audio format for iPadOS. The output integrates seamlessly with Apple Music, GarageBand, and all iPadOS audio applications.
Why Convert RMI to iPad Audio?
iPadOS cannot parse RIFF MIDI containers. The platform supports standard .mid files through its built-in synthesizer, but .rmi files are completely unrecognized by the Files app, Safari, and third-party players. Converting to iPad-optimized AAC produces audio that plays natively on every iPad model with hardware-accelerated decoding.
Apple's A-series processors (A12 Bionic and later) feature a dedicated AAC hardware decoder in the always-on audio subsystem. This means AAC playback consumes nearly zero CPU resources, extending battery life significantly compared to software-decoded formats. The iPad Audio preset targets these hardware capabilities.
Common Use Cases
- Playing legacy Windows RIFF MIDI content on iPad for music education apps
- Converting MIDI compositions from Windows PCs for playback in iPad GarageBand projects
- Migrating corporate MIDI audio assets to iPad-compatible format for enterprise deployments
- Preparing RIFF MIDI ringtone archives for iPad notification sound libraries
- Rendering Windows-era MIDI soundtracks for iPad gaming applications
How It Works
FFmpeg extracts the MIDI data from the RIFF container, synthesizes audio using FluidSynth with a General MIDI SoundFont, and encodes the PCM output as AAC-LC at 256 kbps within an M4A (MPEG-4 Audio) container. The M4A output includes proper ftyp, moov, and mdat atoms for native iPadOS recognition. The -movflags +faststart flag positions metadata for immediate playback without buffering the entire file.
Quality & Performance
AAC-LC at 256 kbps is Apple's standard distribution quality — transparent for virtually all synthesized MIDI content. The Apple audio DSP decodes AAC with bit-perfect accuracy, so encoding quality is the only variable beyond SoundFont selection. A premium SoundFont with multi-velocity instrument samples produces rich audio that AAC encoding preserves faithfully.
Device Compatibility
| Device | RMI | iPad Audio |
|---|---|---|
| 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
- 1Use 256 kbps AAC-LC for iPad — this matches Apple Music's distribution standard and leverages hardware AAC decoding
- 2Add album artwork to the M4A output for proper display in iPadOS Music app
- 3Set the -movflags +faststart flag for instant playback without full file download
- 4Test on iPad mini and iPad Pro to verify consistent audio quality across Apple's SoC generations
- 5Load a SoundFont with natural reverb samples for more realistic piano and orchestral MIDI rendering
RMI to iPad Audio converts Windows RIFF MIDI into iPadOS-native AAC with hardware-accelerated decoding. The SoundFont determines musical quality; the iPad preset ensures optimal battery efficiency.