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Per-Participant NDI ISO Controller for Microsoft Teams. Receives Teams NDI streams, normalizes framerate/resolution, and re-emits clean ISO outputs for live production switchers (vMix, OBS, Ross). Wild Dragon LLC.
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Zac Gaetano c30a6163c8
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Details
fix(engine): self-healing NDI discovery + unified poll loop 
When a process spawns and NDI Find returns zero sources at cold start, the finder can stay stuck on zero forever even when other processes can see Teams' broadcasts. Observed today: a user's PID launched at 12:50, ran for 9+ minutes showing 0 sources, while a parallel PID launched at 12:59 immediately discovered 2 sources. Same exe, same install, same Teams meeting, same medium-integrity SAFER token. The first process's finder simply got into a bad state at construction (suspected: NIC-bind race against mDNS responder readiness, or a SAFER-token quirk in the NDI runtime's IPC layer).

The fix: auto-rebuild the finder when (a) we've never seen a source and 5s have passed since startup, or (b) the source set has been empty for 15s after previously containing entries. Both paths back off (>=5s and >=10s between rebuilds respectively) so we don't churn during legitimate empty periods.

Also: collapsed the previous two-tier (fast then slow) PeriodicTimer loops into a single Task.Delay loop with a dynamic interval. Same behavior (200ms for first 3s, then operator-configured pollInterval), less code, easier to thread the self-healing logic through. The finder is still disposed in a try/finally so cancellation paths don't leak.

246/246 tests still passing. The Discovery tests use PollOnce directly so RunAsync changes don't affect them.
2026-05-16 13:35:22 -04:00
.forgejo/workflows ci: optional MSI + exe code-signing in release.yml 2026-05-10 09:41:28 -04:00
docs chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00
installer fix(installer): wrap shortcut Target in 'runas /trustlevel:0x20000' 2026-05-16 11:43:54 -04:00
src fix(engine): self-healing NDI discovery + unified poll loop 2026-05-16 13:35:22 -04:00
.editorconfig chore: scaffold repo conventions and global build props 2026-05-07 15:07:53 +00:00
.gitignore chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00
build-and-test.ps1 chore: sweep orphaned files (UpdateChecker, UpdateBanner, TeamsControlBridge, helper scripts) 2026-05-10 09:42:29 -04:00
CHANGELOG.md chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00
commit-and-push.ps1 chore: trim stale batch-commit script + drop SmokeTest placeholder 2026-05-15 20:16:14 -04:00
coverlet.runsettings ci: enforce 80% line coverage gate on TeamsISO.Engine 2026-05-07 15:16:11 +00:00
DESIGN.md chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00
Directory.Build.props chore: scaffold repo conventions and global build props 2026-05-07 15:07:53 +00:00
NEXT_STEPS.md docs(next-steps): root cause was explorer-spawn elevation, fix shipped in 191b2c5 2026-05-16 11:39:31 -04:00
PRODUCT.md feat(wpf): v2 'Studio Terminal' shell - theme system, header, transport strip, drawer 2026-05-14 12:46:24 -04:00
README.md chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00
TeamsISO.Linux.slnf feat(console): add TeamsISO.Console headless smoke runner 2026-05-07 15:37:44 +00:00
TeamsISO.sln feat(wpf): rollback to WPF host, axe recording, fix settings pane 2026-05-14 06:02:40 -04:00
TeamsISO.Windows.slnf chore(docs): reconcile to WPF-only after WinUI 3 was abandoned 2026-05-15 19:16:20 -04:00

README.md

TeamsISO

Per-Participant NDI ISO Controller for Microsoft Teams.

TeamsISO sits between Microsoft Teams' raw NDI broadcast output and a live-production environment. It receives each participant's NDI stream, normalizes framerate / resolution / aspect / audio per a configured target, and re-emits clean, individually-addressable NDI sources for ingestion into a switcher (vMix, OBS, Ross, hardware capture).

What it does

  • Discovers participants as Teams broadcasts each one over NDI, surfacing the operator-friendly display name (handles current "MS Teams - Name" format and the legacy "(Teams) Name" format).
  • Normalizes feeds to a consistent framerate, resolution, aspect mode, and audio routing — so the downstream switcher gets predictable inputs regardless of what each participant's webcam is doing.
  • Routes per-participant as separate NDI sources with a configurable output-name template (TEAMSISO_{name}, {guid}, {machine}, {timestamp} tokens).
  • Records each ISO to disk simultaneously — raw BGRA + sidecar manifest.json
    • ffmpeg convert.cmd — so post-production gets a clean per-guest archive.
  • Embeds Teams orchestration: launch and stop Teams from the rail, hide Teams' UI windows during a show, drive in-call controls (mute, camera, share, leave, raise hand) via UIAutomation.
  • Operator presets save the current per-participant ISO assignment and custom output names, applicable on next launch automatically.
  • Live preview thumbnails per participant in the participants table, plus pop-out floating preview windows (right-click → Open preview…) for multi-monitor monitoring.
  • External control surface — REST + WebSocket on 127.0.0.1:9755 and OSC on UDP 127.0.0.1:9000 for Bitfocus Companion / Stream Deck / TouchOSC integration. Self-contained HTML control panel at /ui for phone-as-controller.
  • Crash diagnostics wired to a rolling daily Serilog file sink under %LOCALAPPDATA%\TeamsISO\Logs\.
  • Update check against forge.wilddragon.net's release API — manual or silent on launch (throttled to 24h).
  • Diagnostic bundle export zips logs + config + presets for bug reports.

Status

Pre-1.0. The May 2026 batch is feature-complete; v1.0 cut is gated on code-signing the MSI and a smoke pass against a real Teams meeting. See CHANGELOG.md for the [Unreleased] entry.

The May 2026 ground-up redesign — the v2 "Studio Terminal" shell — has landed on the WPF host (src/TeamsISO.App/). A WinUI 3 replatform was explored in early May 2026 and abandoned (activation blockers + redundant work given the redesign is purely XAML / view-layer); the brief lives at docs/shapes/2026-05-13-teamsiso-v2-studio-terminal.md, and the abandoned migration plan + bootstrap probe are archived under docs/archive/.

Build

Requires .NET 8 SDK on Windows. WPF is the only host:

  • src/TeamsISO.App — WPF, net8.0-windows, the shipping build

Build from the solution filter:

dotnet restore TeamsISO.Windows.slnf
dotnet build TeamsISO.Windows.slnf -c Release
dotnet test TeamsISO.Windows.slnf --filter "Category!=ndi&requires!=ndi"

The shipped helper scripts in the repo root automate this:

pwsh -File .\build-and-test.ps1
pwsh -File .\commit-and-push.ps1

Documentation

Keyboard shortcuts

Key Action
F1 Open help / cheat sheet
Ctrl + K Open the command palette (also Ctrl + P)
Ctrl + T Toggle theme (dark ↔ light)
Ctrl + M Drop a timestamped marker into every active recording
Ctrl + Shift + S Stop every running ISO (emergency)
Ctrl + R Refresh NDI discovery (rebuild finder)
1–9 / NumPad 1–9 Toggle the Nth visible participant's ISO

File locations

Path Contents
%APPDATA%\TeamsISO\config.json Engine settings (framerate, NDI groups, etc.)
%LOCALAPPDATA%\TeamsISO\presets.json Saved operator presets + auto-apply preference
%LOCALAPPDATA%\TeamsISO\Logs\ Rolling daily diagnostic logs
%LOCALAPPDATA%\TeamsISO\Notes\ Per-day show-notes markdown files
%USERPROFILE%\Videos\TeamsISO\<date>\ Default recording output
%APPDATA%\NDI\ndi-config.v1.json NDI Access Manager group routing

License

Proprietary, © Wild Dragon LLC 2026.