SF vs MMF — Comparison & Free Converter
Fast, instant SF (IRCAM) to MMF (SMAF) conversion. No signup required. Just drop your .sf file and get .mmf in seconds.
Batch Settings
Vous travaillez avec des fichiers audio et avez besoin de passer du format SF au MMF ? Que ce soit pour des applications professionnelles, des projets créatifs ou des communications spécifiques, la conversion de ces formats peut parfois s'avérer délicate sans les bons outils. Le format SF, souvent associé à des banques de sons ou des échantillonneurs plus anciens, et le MMF, couramment utilisé pour les sonneries de téléphone mobile ou certains appareils embarqués, ont chacun leurs particularités. Notre outil est conçu pour vous offrir une transition fluide et préserver la qualité de votre audio, vous évitant ainsi les tracas techniques. Simplifiez vos flux de travail et assurez la compatibilité de vos fichiers avec vos différentes plateformes et équipements, qu'ils soient d'ancienne ou de nouvelle génération.
- Archivage de sons pour patrimoines régionaux
- Adaptation de sonneries pour téléphones d'entreprise
- Intégration audio dans des maquettes interactives
En France et en Belgique, le MMF a longtemps été un format courant pour les sonneries personnalisées sur les téléphones mobiles avant l'avènement des formats plus universels comme le MP3. La conversion SF vers MMF peut être pertinente pour la restauration ou l'adaptation de contenus audio plus anciens.
About SF (IRCAM) to MMF (SMAF) Conversion
SF or MMF — which format should you use? The answer depends on your needs. Here's a quick breakdown.
SF is a widely used file format. It has common platform support. MMF is a widely used file format. It has common platform support.
So when should you convert SF to MMF? This conversion is ideal when you When you need a MMF file. This conversion helps you convert between formats quickly.
Converting SF to MMF maintains high quality with CocoConvert's optimised encoder settings.
If you've decided MMF is the right choice, CocoConvert makes the conversion effortless. Upload your .sf file, pick MMF, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert SF (IRCAM) to MMF (SMAF)
- 1
Choose your SF file
Upload your .sf file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to MMF
Select .mmf from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large audio files.
- 4
Get your MMF file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert SF (IRCAM) to MMF (SMAF)
Your SF file is decoded and re-encoded as MMF.
Your SF file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in MMF format
The converted file is ready for download
Format Comparison
SF (IRCAM)
.sf file
| Extension | .sf |
| MIME Type | audio/x-sf |
| Category | Audio |
MMF (SMAF)
.mmf file
| Extension | .mmf |
| MIME Type | audio/x-smaf |
| Category | Audio |
Should You Convert SF (IRCAM) to MMF (SMAF)?
When to Convert
- ✓When you need a MMF file
Frequently Asked Questions
Should I use SF or MMF?
It depends on your goal. SF preserves full quality. MMF preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is MMF higher quality than SF?
Not necessarily. Converting SF to MMF maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert SF to MMF on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for SF to MMF?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for SF to MMF?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.