c7ebab1624
AUDIO-VERIFICATION.md section 1 calls transcode fidelity the question P4 actually raised, needing neither an engine nor a device, and gives it in four lines of shell. Nothing implemented it: verify-video-audio deliberately declines, saying a difference RMS without alignment is meaningless. So the P4/P7 gate has rested on level and non-silence and the fidelity claim has never been made. tools/port/verify-transcode-fidelity now exists and is committed WITHOUT a verdict, deliberately. Four ways the measurement lies, each reproduced here rather than reasoned about. Indexing with a negative lag wraps to the end of the array in Python, so the difference was the transcode subtracted from an unrelated part of the source -- reported 7 dB LOUDER than the source, the same catastrophic-looking number the doc warns of. My regex for the recorded -af truncated the fold to its FL half, folding the source to a left-only signal: the doc names that trap, I reached it through a parsing bug, and the matrix contains runs of spaces so it cannot be tokenised on whitespace. -ss before -i is a container-level jump and on this WMA Pro source returned 4.6 s for a 4.0 s request while the Ogg side returned 4.0 s, so the windows covered different stretches of the movie, best correlation 0.172 -- this one is NOT in the doc and is indistinguishable from the alignment trap that is. And the single-resolution search returned +2413 against a window of +-2400, its own boundary rather than a peak, the same family as the Decoder's period estimator returning its search floor. Why no verdict: best alignment is corr 0.763 on S00A and 0.075 on ADV, and both still report the difference louder than the source, which cannot be true of two aligned signals at equal level. The remaining fault is on my side. A tool printing 'not faithful' in that state would put a false defect on the exporter. It now distinguishes 'could not align' from 'not faithful', two failures I conflated twice before separating them. Filed for the human as a proposal, not an edit: section 1 should carry the imprecise-seek trap as a fourth entry. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.