What is a .OFS file?
OFS is an OptimFROG DualStream file - a lossy-plus-correction audio format that pairs a small lossy stream with data to rebuild the original losslessly.
- Did you know
- OptimFROG is famous for some of the highest lossless compression ratios around, at the cost of being very slow to encode and decode.
- OptimFROG, created by Florin Ghido, can in DualStream mode play a small lossy version on the fly while still allowing a perfect lossless reconstruction.
- Its extreme compression makes it more an archival format than an everyday one, since few portable players can decode it in real time.
- What Analyser reads
- A catch-all for rare and niche formats Analyser still identifies from their bytes: 3D caches and scans (Alembic ABC, FARO FLS/FWS), camera and design data (ARRIRAW ARX, Capture One masks, CATIA CGR), JBIG codestreams, firmware dumps (Binwalk), draw.io diagrams, OptimFROG DualStream audio, RTTTL ringtones, LaTeX style and class files, Sun Raster and Truevision TGA images, MPEG-2 streams, PVR/DVB recordings, Tiled tilesets, Windows Prefetch and Reaper project backups.
- Depth of analysis
- .OFS is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .OFS file
- Drag a .OFS file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.