TASK 51 jitter fix: temporal mask smoothing. MaskSmoother blends each raw segmentation 0.75xnew + 0.25xprevious at the one CameraManager worker (state per CameraSession, not in the shared segmenter); null resets history, first frame passes through, input array never aliased, ping-pong buffers (no LOH alloc for a 147KB 256x144 mask). Creator's real-camera check: Remove was 'jittery' (per-frame independent segmentation). Weights from the OBS/Jitsi consensus. One integration test asserts the second frame keeps partial alpha (x=6 -> 58) where the raw mask cuts to 0. 416 pass / 2 known env flakes. Refs: https://deepwiki.com/royshil/obs-backgroundremoval/2-core-features https://github.com/jitsi/jitsi-meet/issues/17080 (Unit: bg-removal jitter fix)
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# HANDOFF — 2026-10-09 (TASK 51 webcam background Remove + Blur — BUILT)
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# HANDOFF — 2026-10-09 (TASK 51 quality pass: jitter FIXED; blur-heavy is the next unit)
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## Branch
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- main (no feature branch). Pushed through `f8dd107`; everything after is local, **not pushed**
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(push at the creator's call).
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- main (no feature branch). Pushed through `5685c5d` (TRAX toggle); everything after is local,
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**not pushed** (push at the creator's call).
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## Dirty files (NOT mine — do NOT commit)
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- The in-flight "pinned chat" work unit: `Models/YouTube.cs`, `ViewModels/MainViewModel.Chat.cs`,
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untracked `Helpers/RelayCommandGeneric.cs`, and **its hunks in `Controls/LeftPanel.xaml`**
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(lines ~599–610, the chat area). TASK 51 slice 5 edited the SAME file in a different region (the
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webcam properties, ~line 287); only the TASK 51 hunk was staged (`git apply --cached` of that hunk
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alone) — the pinned-chat hunks are still unstaged and untouched.
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- The creator's untracked logo art in `Assets/` (`llamacasty text.*`, `llamacasty-text-nobg*.png`,
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`thin logo wordmark.png`).
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## Dirty files — split by ownership
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- **This work unit (COMMIT these):** `Services/BackgroundEffects/MaskSmoother.cs` (new), the smoother
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wiring in `Services/CameraManager.cs`, `ytLive.Tests/CameraManagerTests.cs` (new integration test),
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and the same-commit memory updates (`Services/index.md`, `ai.md`, `TASKS/task-51-webcam-bg-effects.md`,
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`TASKS.md` row 51, and this file) — all ship in the SAME commit.
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- **NOT mine — do NOT commit:** the in-flight "pinned chat" work unit (`Models/YouTube.cs`,
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`ViewModels/MainViewModel.Chat.cs`, untracked `Helpers/RelayCommandGeneric.cs`, and **its hunks in
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`Controls/LeftPanel.xaml`** — only the webcam-properties region is TASK 51; the pinned-chat hunks
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stayed unstaged/untouched), plus the creator's untracked `Assets/llamacasty*` art.
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- ⚠️ Pre-commit: `scripts/verify.sh` runs `scripts/scope-check.sh` against ALL working-tree changes —
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the not-mine files WILL flag. Pass them to the script as declared-known (checksums unchanged since
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`5685c5d`) or let the script's output be reconciled before committing.
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## What just happened — TASK 51, all five slices
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1. **Engine** — Google's MediaPipe Selfie Segmenter (landscape, Apache-2.0) converted to ONNX by
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`tools/selfie-seg/` and verified vs MediaPipe's own runtime; embedded resource; onnxruntime CPU.
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2. **Blur** — background at ¼ res, 3 box passes, mask-blended; Remove gets edge feather.
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3. **Config** — `WebcamSceneConfig.BackgroundEffect` + `BackgroundStrength`, persisted (additive cols).
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4. **Hookup** — `CameraManager` renders per-scene effect **variants** (one segmentation per raw frame
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on a latest-frame-drop worker; raw path untouched); VM `SyncWebcamEffects()` declares/adopts them.
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Synthetic 720p Debug: segment 1.6 ms, Remove 3.3 ms, Blur 17.5 ms.
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5. **UI** — Background section in the webcam's Layers properties: Remove / Blur `PillToggle`s,
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radio-exclusive, + Strength slider (visible while an effect is on).
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Also this session: 64-bit requirement (`PlatformTarget=x64`), GPL-3.0-or-later licensing, README
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rewrite, TASK 55 (disk hygiene) + TASK 56 (secret scan before going public) queued.
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## Tests
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- Full suite **412 passed / 0 failed**, 0 build warnings. New: `BackgroundEffectEngineTests` (Remove,
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Blur, bundled-model contract), `CameraManagerTests` (variant reaches compositor + preview, raw
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stays raw), `LayoutStorePersistenceTests` (per-scene roundtrip + legacy migration),
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`WebcamBackgroundPillTests` (radio semantics + XAML wiring).
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- Known environment flakes (not regressions): `Mix_HonorsProviderGains…` (fails while system audio
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plays), `RealMouseDrag…` (needs an idle desktop).
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## Known issues / follow-ups
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- **Creator's real-camera check (TASK 51):** toggle Remove/Blur on a webcam, watch edges/lighting,
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and read `startup.log` → "background effects avg … ms/frame".
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- `onnxruntime.dll` ~17 MB; TASK 48's MSIX publish must pin `-r win-x64` (x64-only already enforced).
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- Still stale, not rewritten: ai.md "Windows packaging" (Store IAP / branding-flash paid delta) and
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"Monetization" sections; MARCOM.md asset table (`llama-logo.png` doesn't exist).
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- TASK 56: secret-scan the full history BEFORE the Gitea repo (`gramps/LlamaCasty`) goes public.
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- Carried: "Use default background" toggle still not working (from 2026-10-07).
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## Also shipped after TASK 51 (2026-10-09)
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- **Brand flash OFF by default** (`MainViewModel.ShowBrandFlash = false`; feature kept).
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- **Audio loudness:** `SpeechLeveler` auto-gain in the voice chain + honest mic meter (no +10 dB boost).
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Creator's upload was −28.5 LUFS; the same audio through the new chain measures −17.9 LUFS.
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- **Private broadcast close-out:** Enter keeps / Escape deletes (`KeepBroadcastDialog`,
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`videos.delete`). Untested against the real API — first real private stream is the check.
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## What just happened — temporal jitter fix
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- Creator check: bg Remove is "jittery", Blur is "heavy". User picked **jitter first**.
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- Root cause: `OnnxPersonSegmenter` classifies each frame independently (256×144 mask, bilinear
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upsample) → zero temporal coherence → edge flutter. There is no temporal smoothing upstream.
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- **Fix: `MaskSmoother`** — per-session blend of each raw mask with the previous smoothed one,
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0.75×new + 0.25×previous (`CurrentWeight`, internal). Wired at the ONE production point
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(`CameraManager.RunEffectWorker` → `session.Smoother.Smooth(TrySegment(source))`); state on
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`CameraSession`, NOT the segmenter (segmenter is shared app-wide and contract-pinned to raw output).
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Null mask resets history; first frame/size-change passthrough; never aliases the caller's array; two
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ping-pong buffers, no per-frame LOH alloc. Weights: OBS obs-backgroundremoval 0.85 default test, Jitsi
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jitsi/jitsi-meet#17080 0.7/0.3 best (0.5/0.5 smears on motion).
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- **Test:** `CameraManagerTests.Temporal_Smoothing_Damps_Segmentation_Jitter_Across_Frames` — PASSED.
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A `SteppingMaskSegmenter` returns fresh masks per call: `{1,1,0,0}` then `{1,0.2,0,0}`; 16×4 frame,
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Remove 0.5. Asserts x=6: frame1 = 255 (passthrough), frame2 smoothed = **58**, raw-unsmoothed = 0;
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person core x=1 = 255, background x=14 = 0. ⚠️ Gotcha: the worker's latest-frame-drop guard treats a
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re-queued IDENTICAL frame reference as "no new frame" — pump frame2 as a NEW `VideoFrame` instance.
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- `Assert.Equal(255, first[...])`/`58`/`0` predictions were hand-verified; other pixels differ by
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float rounding (e.g. x=5 Python 34 vs C# 36) — only assert x=6/x=1/x=14.
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## Next step
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- Creator runs the app: webcam → Layers properties → Background → Remove / Blur + Strength.
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1. Run `./scripts/verify.sh` with the declared file list; reconcile the not-mine dirty files with
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scope-check; commit the unit (message `…(Unit: bg-removal jitter fix)` + OBS/Jitsi citations).
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2. Next unit = **Blur "heavy"** — soften the radius curve in `BackgroundEffectProcessor.ApplyBlur`
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(`MinBlurRadius=1 / MaxBlurRadius=12` at ¼ res ≈ 26–50 full px; strength 0.5 → 6 small px). The
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creator needs a retry pass on the real camera after both.
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## Also still open
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- **Vertical-format regression (STALE, not fixed):** 1080p60 vertical selection no longer shrinks the
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capture border in the preview. Mechanism mapped (see prior summary): the crop Rectangle
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`Controls/PreviewPane.xaml:319-322` bound to `OutputRectX/Y/W/H` + `IsOutputCropped`, driven by
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`MainViewModel.Streaming.cs` `ApplyStreamQuality` from `SelectedQuality` (binding + ctor only,
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`new("Vertical 1080p60", 60, 8.0, 1080, 1920)`), `DimRects` in `MainViewModel.cs:91-94`. Root cause
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unknown — paused.
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- **Vertical recording file closed:** the recording itself is 1080×1920 60fps correctly; the
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"whitespace" was the app's preview UI, not the file. Audio loudness (`ebur128`) for the private video
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was never run and the thread is closed unless the user reopens it.
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- Blur-heaviness = next unit (above). Yellow-border regression = stale thread.
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- ⛔ Sudo password rotation pending (user; then update both password lines in `CREDENTIALS.md`).
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- TASK 56 secret scan before `gramps/LlamaCasty` goes public. TASK 55 disk hygiene queued.
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## Tests
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- Full suite **416 passed / 1 known env flake** at `5685c5d`; the new smoothing test passes
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standalone (1 test run, Duration < 1 s after warm). 0 build warnings. Known environment flakes:
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`Mix_HonorsProviderGains…` (fails while system audio plays), `RealMouseDrag…` (needs an idle desktop).
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