jesse
1891f3f11d
CI / quality (push) Successful in 49s
- Sourced from c-finished-videos/2026-07-10 sessions (the actual FD) - Scanned 6 min of audio per-second for RMS/dominant-freq/spectral flatness; picked the most tonally-stable stretches (idle: 272-288s @ ~99Hz flatness<0.02; rev: 319.5-327s @ ~105Hz, louder) - Zero-crossing trim + 150ms equal-power tail-to-head crossfade = seamless loops (seam jump 0.001 / 0.005); normalized to -3dBFS - Shipped as assets/audio/rx7_idle_loop.ogg + rx7_rev_loop.ogg (236KB); wav masters mirrored to NAS 001-1993 Mazda RX-7/sound/ - ROTARY_SOUND.md updated: only Studio upload + 2 asset IDs remain
101 lines
4.2 KiB
Markdown
101 lines
4.2 KiB
Markdown
## Status: loops are BUILT ✅ — awaiting Studio upload
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Real 13B loops were extracted from the owner's own drive footage
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(`/mnt/user/data/c-finished-videos/2026-07-10/`, same car) and processed on the
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workstation. They live at:
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- `assets/audio/rx7_idle_loop.ogg` — 15.9 s steady idle (~99 Hz fundamental,
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scanned as the most tonally stable stretch of the session; seam jump 0.001)
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- `assets/audio/rx7_rev_loop.ogg` — 7.4 s held higher-RPM pull (~105 Hz,
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louder section; seam jump 0.005)
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- Masters (`.wav` + `.ogg`) mirrored to the NAS:
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`.../001-1993 Mazda RX-7/sound/`
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**Remaining (owner, in Studio): upload the two `.ogg` files** (Asset Manager →
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Import, or Creator Dashboard → Audio), wait for moderation, then paste the two
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asset IDs into `CAR_SOUNDS.rx7_fc` in `src/client/SoundController.luau`.
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If a longer/angrier rev is wanted later, more source material exists in the
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other sessions under `c-finished-videos/` — the extraction is repeatable
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(method below).
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---
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# Pipeline reference (how the loops were made / how to redo them)
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The RX-7 must sound like a rotary. The pipeline: the owner's own recordings →
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processed into two seamless loops on this workstation → uploaded in Studio →
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IDs pasted into `SoundController.CAR_SOUNDS`.
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## What the game needs (two loops)
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| Loop | Content | Length |
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|---|---|---|
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| **Idle** | Engine idling, steady. The rotary lope/brap at rest. | 5–10 s |
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| **Rev** | Held at steady mid-high RPM (~4–6k), NOT a sweep. | 5–10 s |
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Steady-state matters: the game pitch-shifts and crossfades these, so a loop
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recorded during rising RPM will "wander" audibly. A long recording containing
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steady sections is fine — the good seconds get cut out in processing.
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## Step 1 — Record (or use existing video)
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Any source works: phone video, GoPro footage, a Zoom H5 recording. Existing
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videos of the car are fine — audio gets extracted. Best results:
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- Record OUTSIDE the car, mic a few feet from the exhaust.
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- Get ≥10 s of steady idle and ≥5 s of held revs.
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- Avoid wind over the mic and people talking.
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Drop the files on the NAS next to the reference photos:
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```
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unraid-1:/mnt/user/data/yy-roblox-games/0-fast-n-furious-sim/001-1993 Mazda RX-7/sound/
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```
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## Step 2 — Process into seamless loops (this workstation)
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Hermes does this — the box already has ffmpeg + numpy/scipy (`avsync-research`
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venv). Ask and it happens; for reference the recipe is:
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1. Extract audio: `ffmpeg -i clip.mp4 -vn -ac 1 -ar 48000 raw.wav`
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2. Find a steady window (visually via spectrogram, or scripted RMS/pitch scan).
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3. Cut the loop at zero-crossings and apply a short equal-power crossfade from
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the tail onto the head so the seam is inaudible:
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loop-body + (last ~150 ms faded out, overlaid on first ~150 ms faded in).
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4. Normalize to about -3 dBFS peak, export `.ogg` (smaller upload, Roblox-native):
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`ffmpeg -i loop.wav -c:a libvorbis -q:a 6 rx7_idle_loop.ogg`
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5. Verify: play the file on repeat (`ffplay -loop 0`) — no click, no wander.
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Outputs: `rx7_idle_loop.ogg` + `rx7_rev_loop.ogg`, copied back to the NAS
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`sound/` folder and kept in `assets/audio/` locally (small enough to commit).
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## Step 3 — Upload in Studio (owner)
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1. Studio → **View → Asset Manager → Import** (or the Creator Dashboard →
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Development Items → Audio) → upload both `.ogg` files.
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2. Audio uploads require an ID/phone-verified account; private audio uploaded
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to YOUR account is playable in YOUR experiences — exactly our case.
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3. Copy each asset ID after moderation clears (usually minutes).
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## Step 4 — Wire in
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In `src/client/SoundController.luau`, uncomment and fill:
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```lua
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local CAR_SOUNDS: { [string]: EngineSounds } = {
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rx7_fc = {
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Idle = "rbxassetid://<idle id>",
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Rev = "rbxassetid://<rev id>",
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},
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}
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```
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Rebuild, playtest, adjust `IDLE_PITCH_*` / `REV_PITCH_*` / `CROSSFADE_*` to
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taste. Done — the RX-7 braps.
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## Why not a toolbox rotary?
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Searched; candidates exist (e.g. "13B ROTARY ENGINE SOUND", id 118059219867199)
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but can't be auditioned outside Roblox (asset downloads require auth), most are
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short unloopable rips, and rights are murky. The owner HAS the real car — its
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actual engine is strictly better than any stranger's rip. Toolbox is the
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fallback only if recording proves impractical: audition in Studio before
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committing to one.
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