LOSSELOT
Figure out if your file ever became lossy.
Also: A tool for working with LLMs and decision trees while maintaining a codebase.
The Stuff
Web Analyzer Drop a file, get instant analysis. Runs in-browser via WASM. Decision Graph Interactive view of 87+ development decisions. The project's memory. Timeline Git commits merged with decision nodes. Filter, search, trace. Graph Explorer Force-directed visualization. Zoom, pan, find paths. The Story Narrative walkthrough of how this project evolved. Claude Tooling How AI-assisted development works here. About Decision Graphs Why track decisions? How the memory system works.How Detection Works
When someone converts MP3 to FLAC, the removed frequencies don't come back. Losselot finds these scars.
Spectral Analysis
FFT detects frequency cutoffs. 128kbps MP3 cuts at ~16kHz, 320kbps at ~20kHz. We find where the music stops.
Binary Analysis
Encoder signatures hide in files. LAME headers, FFmpeg markers, re-encoding chains. Metadata doesn't lie.
| Score | Verdict | Meaning |
|---|---|---|
| 0-34 | OK | Likely genuine lossless |
| 35-64 | SUSPECT | Possibly transcoded |
| 65+ | TRANSCODE | Definitely lossy origin |