TASK 4 ship step 5.5: social bar bug fixes + bar on the live output — direction-snap drag (SocialBarSnap.Decide + ClearValue, local Canvas.Top was overriding the binding), fediverse nodeinfo subdomain probing + load-time heal (settable FediverseSoftware), SocialBarRenderer strip blitted above the flash via a re-read FramePump socialBar seam — 155 tests passing, 0 warnings

Services/Compositor/SceneCompositor.cs

@@ -18,13 +18,16 @@ public sealed class SceneCompositor
     /// Composite <paramref name="scene"/> into the tier's output frame. Layer order (back →
     /// front): live backdrop (the scene's <c>IsBackdrop</c> source) → background image →
     /// visible elements (z-order = <c>Elements</c> order, mirroring the XAML DataTemplate) →
-    /// branding flash. Transparent regions read opaque black.
+    /// branding flash → social bar (a global overlay; spans the master width at
+    /// <paramref name="socialBarTop"/>). Transparent regions read opaque black.
     /// </summary>
     public VideoFrame Render(
         Scene scene,
         Func<SceneElement, VideoFrame?> frameFor,
         VideoFrame? flashFrame,
-        CompositorOptions options)
+        CompositorOptions options,
+        VideoFrame? socialBarFrame = null,
+        int socialBarTop = 0)
     {
         if (scene == null) throw new ArgumentNullException(nameof(scene));
         if (frameFor == null) throw new ArgumentNullException(nameof(frameFor));
@@ -79,7 +82,10 @@ public sealed class SceneCompositor
         }
 
         if (flashFrame != null)
-            BlitFlash(buffer, cropW, cropH, options, flashFrame);
+            BlitOverlay(buffer, cropW, cropH, options, flashFrame, 0, 0);
+
+        if (socialBarFrame != null && socialBarFrame.Width > 0 && socialBarFrame.Height > 0)
+            BlitOverlay(buffer, cropW, cropH, options, socialBarFrame, 0, socialBarTop);
 
         return StretchMath.BilinearScale(
             new VideoFrame(cropW, cropH, buffer), options.OutputWidth, options.OutputHeight);
@@ -166,17 +172,20 @@ public sealed class SceneCompositor
         }
     }
 
-    /// <summary>1:1 copy of the master-sized branding flash, cropped to the active source rect.</summary>
-    private static void BlitFlash(byte[] dst, int dstW, int dstH, CompositorOptions options, VideoFrame flash)
+    /// <summary>1:1 copy of a master-sized overlay (flash, social bar) cropped to the
+    /// active source rect. The overlay is positioned in master space by (sx0, sy0).</summary>
+    private static void BlitOverlay(
+        byte[] dst, int dstW, int dstH, CompositorOptions options,
+        VideoFrame overlay, int sx0, int sy0)
     {
         for (var y = 0; y < dstH; y++)
         {
             for (var x = 0; x < dstW; x++)
             {
-                var sx = x + options.SourceRectX;
-                var sy = y + options.SourceRectY;
-                if (sx >= flash.Width || sy >= flash.Height) continue;
-                var sample = StretchMath.SampleBgra(flash.BgraPixels, flash.Width, flash.Height, sx, sy);
+                var sx = x + options.SourceRectX - sx0;
+                var sy = y + options.SourceRectY - sy0;
+                if (sx < 0 || sy < 0 || sx >= overlay.Width || sy >= overlay.Height) continue;
+                var sample = StretchMath.SampleBgra(overlay.BgraPixels, overlay.Width, overlay.Height, sx, sy);
                 BlendPixel(dst, (y * dstW + x) * 4, sample, 1f);
             }
         }

Services/Compositor/SocialBarRenderer.cs

@@ -0,0 +1,107 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Media.Effects;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+using ytLive.Models;
+
+namespace ytLive.Services.Compositor;
+
+/// <summary>
+/// Rasterizes the global social bar into a transparent BGRA8 strip the output
+/// compositor overlays onto the master frame (top or bottom edge). Replicates the
+/// preview's bar DataTemplate in code — one Path (logo) + one TextBlock (handle)
+/// per entry, white on transparent, green glow — then software-renders it via
+/// <c>RenderTargetBitmap</c> and converts Pbgra32 (premultiplied) to straight-alpha
+/// BGRA for the compositor. WPF glue like <see cref="StaticPixelCache"/>: the
+/// compositor core itself stays pure byte-math. Renders on the UI thread only;
+/// the returned frame is immutable afterwards, so the frame pump may read it from
+/// any thread.
+/// </summary>
+public static class SocialBarRenderer
+{
+    /// <summary>Icon size + the preview's 8px top/bottom margins.</summary>
+    private const int ContentHeight = 40;
+
+    /// <summary>Room for the green DropShadowEffect blur to bleed past the content.</summary>
+    private const int GlowPad = 24;
+
+    /// <summary>Master-frame width — the bar spans the full 1920px output.</summary>
+    public const int Width = 1920;
+
+    /// <summary>Returns the strip frame, or null when there is nothing to render.</summary>
+    public static VideoFrame? Render(IEnumerable<SocialEntry>? entries)
+    {
+        var list = entries?.Where(e => e != null).ToList();
+        if (list == null || list.Count == 0) return null;
+
+        var height = ContentHeight + GlowPad * 2;
+
+        var row = new StackPanel { Orientation = Orientation.Horizontal };
+        foreach (var entry in list)
+        {
+            var item = new StackPanel
+            {
+                Orientation = Orientation.Horizontal,
+                Margin = new Thickness(0, 0, 20, 0),
+            };
+            item.Children.Add(new Path
+            {
+                Data = Geometry.Parse(entry.LogoData),
+                Fill = Brushes.White,
+                Width = 24,
+                Height = 24,
+                Stretch = Stretch.Uniform,
+                VerticalAlignment = VerticalAlignment.Center,
+            });
+            item.Children.Add(new TextBlock
+            {
+                Text = entry.Handle,
+                Foreground = Brushes.White,
+                FontSize = 14,
+                VerticalAlignment = VerticalAlignment.Center,
+                Margin = new Thickness(8, 0, 0, 0),
+                MaxWidth = 200,
+                TextTrimming = TextTrimming.CharacterEllipsis,
+            });
+            row.Children.Add(item);
+        }
+
+        // The glow is baked in so the output bar matches the preview's green halo.
+        var container = new Grid
+        {
+            Width = Width,
+            Height = height,
+            Background = Brushes.Transparent,
+            Effect = new DropShadowEffect { Color = Color.FromRgb(0x2e, 0xcc, 0x71), BlurRadius = 18, ShadowDepth = 0, Opacity = 0.9 },
+        };
+        var centered = new Grid { HorizontalAlignment = HorizontalAlignment.Center, Margin = new Thickness(0, GlowPad, 0, 0) };
+        centered.Children.Add(row);
+        container.Children.Add(centered);
+
+        container.Measure(new Size(Width, height));
+        container.Arrange(new Rect(0, 0, Width, height));
+
+        var bitmap = new RenderTargetBitmap(Width, height, 96, 96, PixelFormats.Pbgra32);
+        bitmap.Render(container);
+
+        var pixels = new byte[Width * height * 4];
+        bitmap.CopyPixels(pixels, Width * 4, 0);
+
+        // Pbgra32 is premultiplied — unpremultiply so the compositor's straight-alpha
+        // source-over blend doesn't darken the logo edges with a halo.
+        for (var i = 0; i < pixels.Length; i += 4)
+        {
+            var a = pixels[i + 3];
+            if (a == 0 || a == 255) continue;
+            pixels[i] = (byte)(pixels[i] * 255 / a);
+            pixels[i + 1] = (byte)(pixels[i + 1] * 255 / a);
+            pixels[i + 2] = (byte)(pixels[i + 2] * 255 / a);
+        }
+
+        return new VideoFrame(Width, height, pixels);
+    }
+}

Services/Encoder/FramePump.cs

@@ -28,6 +28,7 @@ public sealed class FramePump : IDisposable
     private readonly Func<IFfmpegEncoder> _encoderFactory;
     private readonly Action<string>? _log;
     private readonly Func<TimeSpan, CancellationToken, Task> _pacingDelay;
+    private readonly Func<(VideoFrame? Frame, SocialBarPosition Position)>? _socialBar;
     private readonly SceneCompositor _compositor = new();
 
     private readonly object _gate = new();
@@ -49,7 +50,8 @@ public sealed class FramePump : IDisposable
         Func<EncoderOptions?> encoderOptions,
         Func<IFfmpegEncoder> encoderFactory,
         Action<string>? log = null,
-        Func<TimeSpan, CancellationToken, Task>? pacingDelay = null)
+        Func<TimeSpan, CancellationToken, Task>? pacingDelay = null,
+        Func<(VideoFrame? Frame, SocialBarPosition Position)>? socialBar = null)
     {
         _sceneProvider = sceneProvider ?? throw new ArgumentNullException(nameof(sceneProvider));
         _frameResolver = frameResolver ?? throw new ArgumentNullException(nameof(frameResolver));
@@ -58,6 +60,7 @@ public sealed class FramePump : IDisposable
         _encoderFactory = encoderFactory ?? throw new ArgumentNullException(nameof(encoderFactory));
         _log = log;
         _pacingDelay = pacingDelay ?? ((delay, ct) => Task.Delay(delay, ct));
+        _socialBar = socialBar;
     }
 
     public bool IsRunning { get; private set; }
@@ -212,7 +215,20 @@ public sealed class FramePump : IDisposable
                 var scene = _sceneProvider();
                 if (scene != null)
                 {
-                    var frame = _compositor.Render(scene, _frameResolver, null, _compositorOptions());
+                    var compositorOptions = _compositorOptions();
+                    VideoFrame? socialBarFrame = null;
+                    var socialBarTop = 0;
+                    if (_socialBar != null)
+                    {
+                        var (barFrame, position) = _socialBar();
+                        socialBarFrame = barFrame;
+                        if (barFrame != null)
+                            socialBarTop = position == SocialBarPosition.Top
+                                ? 0
+                                : compositorOptions.SourceRectHeight - barFrame.Height;
+                    }
+                    var frame = _compositor.Render(
+                        scene, _frameResolver, null, compositorOptions, socialBarFrame, socialBarTop);
                     IFfmpegEncoder? encoder;
                     lock (_gate) encoder = _encoder;
                     if (encoder == null) break; // _encoder is only cleared after the loop ends; defensive

Services/SocialValidator.cs

@@ -23,6 +23,11 @@ public sealed class SocialLookupResult
 public interface ISocialValidator
 {
     Task<SocialLookupResult> LookupAsync(SocialService service, string handleOrUrl, CancellationToken ct);
+
+    /// <summary>Best-effort nodeinfo software name (mastodon/peertube/...) for a
+    /// fediverse domain, or null when it can't be resolved. The load-time heal
+    /// uses this to fix a bar entry whose stored software is missing.</summary>
+    Task<string?> ResolveFediverseSoftwareAsync(string domain, CancellationToken ct);
 }
 
 /// <summary>
@@ -35,14 +40,19 @@ public interface ISocialValidator
 public sealed class HttpSocialValidator : ISocialValidator
 {
     private readonly HttpClient _client;
+    private readonly Action<string>? _log;
 
-    public HttpSocialValidator(HttpClient? client = null)
+    public HttpSocialValidator(HttpClient? client = null, Action<string>? log = null)
     {
         _client = client ?? new HttpClient();
         _client.DefaultRequestHeaders.UserAgent.ParseAdd(
             "Mozilla/5.0 (compatible; ytLlive social validator)");
+        _log = log;
     }
 
+    public Task<string?> ResolveFediverseSoftwareAsync(string domain, CancellationToken ct)
+        => TryFetchFediverseSoftwareAsync(domain, ct);
+
     public async Task<SocialLookupResult> LookupAsync(SocialService service, string handleOrUrl, CancellationToken ct)
     {
         var input = handleOrUrl.Trim();
@@ -127,32 +137,67 @@ public sealed class HttpSocialValidator : ISocialValidator
     /// nodeinfo link, read `software.name`. If the identity domain is itself a
     /// redirect (e.g. a YunoHost domain whose default app lives on a subdomain),
     /// the bare root 302s to the real instance — follow it and ask that host.
-    /// Failures return null — validation still succeeds, the icon just falls
-    /// back to the generic fediverse glyph.
+    /// If neither answers, probe well-known subdomains (mastodon.example.com)
+    /// so a landing-page domain still resolves its real instance. The whole
+    /// resolution is bounded by a ~15s budget. Failures return null — validation
+    /// still succeeds, the icon just falls back to the generic fediverse glyph.
     /// </summary>
     private async Task<string?> TryFetchFediverseSoftwareAsync(string domain, CancellationToken ct)
     {
         try
         {
-            var software = await FetchSoftwareNameAsync(domain, ct);
+            using var budget = System.Threading.CancellationTokenSource.CreateLinkedTokenSource(ct);
+            budget.CancelAfter(TimeSpan.FromSeconds(15));
+
+            var software = await FetchSoftwareNameAsync(domain, budget.Token);
             if (software != null) return software;
 
-            var resolved = await ResolveInstanceHostAsync(domain, ct);
-            if (resolved == null
-                || string.Equals(resolved, domain, System.StringComparison.OrdinalIgnoreCase))
-                return null;
-            return await FetchSoftwareNameAsync(resolved, ct);
+            var resolved = await ResolveInstanceHostAsync(domain, budget.Token);
+            if (resolved != null
+                && !string.Equals(resolved, domain, System.StringComparison.OrdinalIgnoreCase))
+            {
+                software = await FetchSoftwareNameAsync(resolved, budget.Token);
+                if (software != null) return software;
+            }
+
+            foreach (var sub in FediverseSubdomainCandidates)
+            {
+                var host = $"{sub}.{domain}";
+                software = await FetchSoftwareNameAsync(host, budget.Token);
+                if (software != null)
+                {
+                    _log?.Invoke($"SocialValidator: fediverse software '{software}' for '{domain}' resolved via {host}");
+                    return software;
+                }
+            }
+            _log?.Invoke($"SocialValidator: no nodeinfo found for '{domain}'");
+            return null;
         }
         catch (System.OperationCanceledException) when (ct.IsCancellationRequested)
         {
             return null; // caller checks ct.IsCancellationRequested and reports Canceled
         }
-        catch
+        catch (System.OperationCanceledException)
         {
+            _log?.Invoke($"SocialValidator: nodeinfo resolution for '{domain}' timed out");
+            return null;
+        }
+        catch (System.Exception ex)
+        {
+            _log?.Invoke($"SocialValidator: nodeinfo resolution for '{domain}' failed: {ex.Message}");
             return null;
         }
     }
 
+    /// <summary>Common instance subdomains, probed in order when the identity
+    /// domain itself doesn't serve nodeinfo (a landing page or SSO gate in front
+    /// of a self-hosted instance).</summary>
+    private static readonly string[] FediverseSubdomainCandidates =
+    {
+        "mastodon", "social", "fediverse", "tube", "peertube",
+        "pixelfed", "lemmy", "pleroma", "misskey", "gotosocial", "fedi", "instance",
+    };
+
     private async Task<string?> FetchSoftwareNameAsync(string domain, CancellationToken ct)
     {
         var nodeInfoUrl = await FetchNodeInfoUrlAsync(domain, ct);

Services/index.md

@@ -27,12 +27,13 @@ External-facing logic: YouTube API, persistence. See
 | `ScreenCaptureFrameSource.cs` | One `Direct3D11CaptureFramePool` (free-threaded, 2 buffers) + session per target; frames → `SoftwareBitmap.CreateCopyFromSurfaceAsync` (BGRA, alpha ignored) → `VideoFrame`, bytes read via `WindowsRuntimeMarshal.TryGetDataUnsafe` (CsWinRT-safe — the `IMemoryBufferByteAccess` ComImport cast fails on every frame and is gone). Surfaces > 1920×1080 downscaled bilinearly to the master; conversion failures logged ≤ once/5 s. DRM content = black frames (OS limit). `CreateForMonitor`/`CreateForWindow`/`CreateForPicker` |
 | `ScreenCaptureManager.cs` | Screen-capture ownership mirroring `CameraManager`: refcounted by target key, one shared `WriteableBitmap`, dispatcher-coalesced latest-frame copies; `PreviewBitmapChanged`/`CaptureFailed` events; `ReleaseAllAsync` used on re-designation |
 | `ScreenCaptureSourceFactory.cs` | `Resolve(key)` parses `monitor:<n>` / `window:<hwnd>` / `picker:<name>` into a source; `PickAsync()` shows the OS `GraphicsCapturePicker` and returns the `picker:` key (transient — a reload falls back to auto-detection) |
-| `Compositor/SceneCompositor.cs` | **The output compositor (TASK 4 ship step 1)**: renders a scene into the encoder's master `VideoFrame` (tightly-packed BGRA8), mirroring the XAML preview minus editing chrome — backdrop → background → elements (`UniformToFill` cover-crop, round clip, mirror, opacity, border) → branding flash. Pure and WPF-free: frames injected via a `Func<SceneElement, VideoFrame?>` resolver (webcam → DeviceId, image → AssetId, backdrop → CaptureKey); output sized by `CompositorOptions` (16:9 = full master 1:1; vertical 9:16 = 607×1080 crop → 1080×1920 bilinear). Preview stays XAML (editing view); this is the output view — see `ai.md` "Scene compositor" |
+| `Compositor/SceneCompositor.cs` | **The output compositor (TASK 4 ship step 1)**: renders a scene into the encoder's master `VideoFrame` (tightly-packed BGRA8), mirroring the XAML preview minus editing chrome — backdrop → background → elements (`UniformToFill` cover-crop, round clip, mirror, opacity, border) → branding flash → social bar (optional `socialBarFrame` + `socialBarTop` in master space, blitted last so the bar sits above the flash; the old `BlitFlash` generalized to `BlitOverlay` with source offsets). Pure and WPF-free: frames injected via a `Func<SceneElement, VideoFrame?>` resolver (webcam → DeviceId, image → AssetId, backdrop → CaptureKey); output sized by `CompositorOptions` (16:9 = full master 1:1; vertical 9:16 = 607×1080 crop → 1080×1920 bilinear). Preview stays XAML (editing view); this is the output view — see `ai.md` "Scene compositor" |
 | `Compositor/CompositorOptions.cs` | The active tier's output rect (source space over the 1920×1080 master, integer-aligned — `MainViewModel.OutputRectX` can be 656.5) + target W×H |
 | `Compositor/StretchMath.cs` | Pure pixel math: the WPF `UniformToFill` cover-crop, clamped bilinear sample/scale (unit-tested half of the compositor) |
 | `Compositor/StaticPixelCache.cs` | Asset bytes → cached BGRA8 `VideoFrame`, decoded once per content hash — the output path's raw-pixel source (the preview uses ImageCache's `BitmapImage`) |
 | `Encoder/IFfmpegLocator.cs` | **TASK 4 ship step 2 seam**: resolves an absolute path to `ffmpeg.exe` (PATH first → cached `%APPDATA%\ytLlive\tools\ffmpeg.exe` → pinned BtbN LGPL-shared zip download). The encoder step and tests fake it |
-| `SocialValidator.cs` | `ISocialValidator` seam + `HttpSocialValidator` default: validates a social handle/URL by constructing the canonical profile URL and issuing an HTTP GET — the "act of validation" before adding to the bar. 200/redirect = exists; 404/connection failure = rejected. Fediverse `@user@domain` additionally does a best-effort nodeinfo lookup (`/.well-known/nodeinfo` → `software.name`) so the entry can show the instance's real logo; nodeinfo failure still validates (generic fediverse glyph). If the identity domain's nodeinfo is blocked (SSO) but the bare root 302s to the real instance (YunoHost default-app subdomains), the lookup follows the redirect and asks that host instead. Constructor takes optional `HttpClient` for tests |
+| `SocialValidator.cs` | `ISocialValidator` seam + `HttpSocialValidator` default: validates a social handle/URL by constructing the canonical profile URL and issuing an HTTP GET — the "act of validation" before adding to the bar. 200/redirect = exists; 404/connection failure = rejected. Fediverse `@user@domain` additionally does a best-effort nodeinfo lookup (`/.well-known/nodeinfo` → `software.name`) so the entry can show the instance's real logo; nodeinfo failure still validates (generic fediverse glyph). If the identity domain's nodeinfo is blocked (SSO) but the bare root 302s to the real instance (YunoHost default-app subdomains), the lookup follows the redirect and asks that host. Since the bar bug-fix branch the resolution **probes well-known subdomains** (`mastodon.`, `social.`, ... order in `FediverseSubdomainCandidates`) when both the identity domain and its redirect come up empty, bounded by a ~15s linked-CTS budget; `ResolveFediverseSoftwareAsync(domain, ct)` on the seam powers the load-time heal. Constructor takes optional `HttpClient` + `Action<string>` log for tests |
+| `Compositor/SocialBarRenderer.cs` | **Social bar output strip** (bar bug-fix branch): rasterizes the global social bar into a transparent straight-alpha BGRA8 `VideoFrame` strip (1920 wide, 40px content + 24px glow pad) via `RenderTargetBitmap` — one Path (logo) + one TextBlock (handle) per entry, white on transparent with the preview's green `#2ecc71` glow baked in (Pbgra32 → straight-alpha unpremultiply). UI thread only; the frame is immutable afterwards so the `FramePump` reads it from its own thread |
 | `Encoder/EncoderOptions.cs` | One go-live's encoder config: full `RtmpUrl` (ingest + stream key), W×H/FPS/bitrate from the quality tier, `VideoEncoder` (null = probe), audio sample rate/channels, `GopSize` = FPS×4 (the ≤4s keyframe bound) |
 | `Encoder/IFfmpegEncoder.cs` | **TASK 4 ship step 3 seam**: start/feed/stop the live encoder; `HealthUpdated` (parsed `StreamHealth`), `ProcessFailed` on unexpected non-zero exit. Constructor-injected locator + process factory (tests fake both) |
 | `Encoder/FfmpegEncoder.cs` | The default encoder: spawn `ffmpeg.exe` (probe `-encoders` first → hardware NVENC/QSV/AMF, OpenH264 fallback — never libx264), feed raw BGRA frames into stdin, parse `-stats` lines into `StreamHealth`, graceful stop via stdin EOF + 10s kill watchdog. Constructed by `MainViewModel` since ship step 5 (`new FfmpegEncoder(new FfmpegLocator())`), driven by the `FramePump` |
@@ -41,7 +42,7 @@ External-facing logic: YouTube API, persistence. See
 | `Encoder/FfmpegArgs.cs` | Pure FFmpeg command-line builder: rawvideo `pipe:0` input, `anullsrc` silent audio (WASAPI replaces it), H.264+AAC, closed GOP (`-g fps×4 -keyint_min -sc_threshold 0 -bf 0`, `yuv420p`), FLV → RTMP |
 | `Encoder/FfmpegProgressParser.cs` | Pure parser for `frame=/fps=/size=/time=/bitrate=` stats lines → `FfmpegProgress` |
 | `Encoder/FfmpegEncoderPicker.cs` | Pure H.264 encoder picker from `-encoders` output: NVENC → QSV → AMF → OpenH264; **never returns libx264** (GPL) |
-| `Encoder/FramePump.cs` | **TASK 4 ship step 5**: the live frame producer — while live it snapshots the active scene each tick, resolves every element to its latest frame (`Func<SceneElement, VideoFrame?>` resolver), composites it into the tier's output frame, and paces frames into the encoder at the tier's FPS. All collaborators constructor-injected seams; free of WPF and the capture managers. `StartAsync` never throws (failures log + `Failed`); no RTMP URL = encoder skipped; `StopAsync` stops the encoder before awaiting the loop (backpressure deadlock); `ProcessFailed` self-stops. See `ai.md` "Live frame pipeline" |
+| `Encoder/FramePump.cs` | **TASK 4 ship step 5**: the live frame producer — while live it snapshots the active scene each tick, resolves every element to its latest frame (`Func<SceneElement, VideoFrame?>` resolver), composites it into the tier's output frame, and paces frames into the encoder at the tier's FPS. All collaborators constructor-injected seams; free of WPF and the capture managers. `StartAsync` never throws (failures log + `Failed`); no RTMP URL = encoder skipped; `StopAsync` stops the encoder before awaiting the loop (backpressure deadlock); `ProcessFailed` self-stops. Since the bar bug-fix branch it takes an optional `socialBar: Func<(VideoFrame? Frame, SocialBarPosition Position)>?` seam — a pre-rendered bar strip composited last (above the flash) at the top edge or `SourceRectHeight − bar height`. See `ai.md` "Live frame pipeline" |
 | `Encoder/FfmpegLocator.cs` | The default locator: PATH probe wins, then the cache, then pull+extract (`ffmpeg.exe` **+ the `libav*.dll` family** via a staging dir, failures via `AppLog`). Pinned to BtbN `autobuild-2026-08-09-13-03` **lgpl-shared** (dynamic linking = LGPL compliance without static-relink §6 material; no GPL libx264; NVENC/QSV/AMF + libopenh264 + native AAC — see `ai.md` → Licensing). Search dirs / tools dir / downloader constructor-injected for hermetic tests. Wired into the encoder since ship step 5 |
 | `Audio/IAudioSource.cs` | **TASK 4 ship step 4 seam**: live capture source — `Start`/`Stop`/`SampleReady(AudioSample)`/`Failed(Exception)`, `IDisposable`; runs only while live. The app consumes this seam; tests inject hermetic fakes |
 | `Audio/AudioSample.cs` | One captured chunk: interleaved PCM float (-1..1) + sample rate + channels |