From f177ee90a45a0a39bdff149272e2fb7754a553f3 Mon Sep 17 00:00:00 2001
From: MelekTaus <melektaus@outlook.at>
Date: Mon, 12 Oct 2026 13:40:47 +0200
Subject: [PATCH] Record the whole editor from the main menu

The game view could already record itself through nodes. Making a
video of the editor itself, to show how something is done, needed an
outside screen recorder. The main menu now starts and stops one, with
no options to set.

- "Start recording" sits in its own group before General settings, and
  reads "Stop recording" while one runs. The name is
  "Recording <time>", the size is the whole canvas in device pixels
  (an odd row or column is cut), 60 fps always. Sound is the master,
  saving goes the same way as for the game view.
- The encoder, the sound and the Matroska writing of a take moved from
  GameRecorder.ts to RecordingTake.ts. A take now reads its pictures
  from a FrameSource, so the game view and the editor share it.
- The editor's picture is copied from the canvas after each render, in
  the same frame, so nothing is drawn twice. A resting editor does not
  render, and the recording repeats its last picture.
- The mouse pointer is drawn into the recording in the shape the editor
  shows (arrow, hand, resize arrows, I-beam, crosshair, move).
- A red dot with the running time stands beside the menu button on
  screen only. It is drawn after the copy, and the toolbar makes room
  for it.
- Drawing that dot made Pixi take it as the root for every hit test,
  and the menu would not open any more. The stage is set back as the
  last rendered object after it.

Tests:
- Gate on melektaus-atx green: 303 files, 4686 tests.
- Unit recording: 20 green, 5 new.
- e2e 67: 8 checks, 67e new. It records through the menu and decodes
  the MP4: 1280x800 at 60 fps, the pointer black at the mouse, the dot
  missing, 238 plain spots alike with the canvas. Without the pointer
  and with the dot drawn before the copy, 67e is red.
- e2e 46: the main menu lists "Start recording".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 README.md                       |   2 +-
 src/core/recording/cursors.ts   |  59 ++++
 src/core/recording/recording.ts |  40 +++
 src/editor/Editor.ts            |  41 ++-
 src/editor/EditorRecorder.ts    | 281 +++++++++++++++++
 src/editor/PlaySession.ts       |   3 +-
 src/editor/panels/Toolbar.ts    |  22 +-
 src/editor/recordingUploads.ts  |   4 +-
 src/viewport/GameRecorder.ts    | 522 ++++----------------------------
 src/viewport/RecordingTake.ts   | 498 ++++++++++++++++++++++++++++++
 tests/core/recording.test.ts    |  37 +++
 tools/e2e/46-topbar.mjs         |   4 +-
 tools/e2e/67-recording.mjs      | 155 +++++++++-
 13 files changed, 1190 insertions(+), 478 deletions(-)
 create mode 100644 src/core/recording/cursors.ts
 create mode 100644 src/editor/EditorRecorder.ts
 create mode 100644 src/viewport/RecordingTake.ts

diff --git a/README.md b/README.md
index 1df03417..8b3238ee 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ npm run build        # writes dist/ and regenerates index.html; the folder is wh
 The browser suite and the three example games need a machine with a GPU:
 
 ```bash
-node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 2038 checks (GM_STEPS=20 for one step)
+node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 2039 checks (GM_STEPS=20 for one step)
                                                    #   every tool signs in first – see the Accounts page
 node tools/seed-jumprun.mjs && node tools/smoke-jumprun.mjs
 node tools/seed-tetris.mjs && node tools/smoke-tetris.mjs
diff --git a/src/core/recording/cursors.ts b/src/core/recording/cursors.ts
new file mode 100644
index 00000000..797f5313
--- /dev/null
+++ b/src/core/recording/cursors.ts
@@ -0,0 +1,59 @@
+/**
+ * The mouse pointer of an editor recording: the system draws it over the canvas, so the recording
+ * draws its own. One shape per CSS cursor the editor uses, as an SVG path in CSS pixels, filled dark
+ * and outlined light like a system cursor. `hot` is the point that sits on the pointer.
+ */
+
+export interface CursorShape {
+  path: string;
+  hot: { x: number; y: number };
+  /** Degrees the path is turned by around `hot`. */
+  turn: number;
+}
+
+const ARROW = 'M0 0 L0 16 L4.2 12.2 L7 18.6 L9.6 17.5 L6.9 11.3 L12 11.3 Z';
+const DOUBLE_ARROW = 'M-11 0 L-6 -5 L-6 -2 L6 -2 L6 -5 L11 0 L6 5 L6 2 L-6 2 L-6 5 Z';
+const MOVE =
+  'M0 -11 L4 -7 L1.5 -7 L1.5 -1.5 L7 -1.5 L7 -4 L11 0 L7 4 L7 1.5 L1.5 1.5 L1.5 7 L4 7 L0 11 ' +
+  'L-4 7 L-1.5 7 L-1.5 1.5 L-7 1.5 L-7 4 L-11 0 L-7 -4 L-7 -1.5 L-1.5 -1.5 L-1.5 -7 L-4 -7 Z';
+const CROSS = 'M-1 -10 L1 -10 L1 -1 L10 -1 L10 1 L1 1 L1 10 L-1 10 L-1 1 L-10 1 L-10 -1 L-1 -1 Z';
+const BEAM = 'M-4 -9 L4 -9 L4 -7.5 L1 -7.5 L1 7.5 L4 7.5 L4 9 L-4 9 L-4 7.5 L-1 7.5 L-1 -7.5 L-4 -7.5 Z';
+const HAND =
+  'M5 0 C6 0 7 0.8 7 2 L7 7 C7.5 6.5 9 6.5 9.5 7.5 C10 7 11.5 7 12 8 C12.5 7.6 14 7.8 14 9.5 ' +
+  'L14 14 C14 16.5 12.5 18 10 18 L7 18 C5.5 18 4.5 17.2 3.5 16 L0.6 11.8 C-0.2 10.6 1.2 9.2 ' +
+  '2.4 10.1 L3 10.6 L3 2 C3 0.8 4 0 5 0 Z';
+const OPEN_HAND =
+  'M3 7 C3 5.5 5 5.5 5 7 L5 3 C5 1.5 7 1.5 7 3 L7 2 C7 0.5 9 0.5 9 2 L9 3 C9 1.5 11 1.5 11 3 ' +
+  'L11 5 C11 3.5 13 3.5 13 5 L13 12 C13 15.5 11 18 8 18 L7 18 C5 18 4 17 3 15.5 L0.5 11.5 ' +
+  'C-0.3 10.3 1.2 9 2.3 9.9 L3 10.5 Z';
+const FIST =
+  'M3 8 C3 6.5 5 6.5 5 7.5 C5 6 7 6 7 7.2 C7 5.8 9 5.8 9 7.2 C9 6 11 6 11 7.5 C11 6.6 13 6.6 ' +
+  '13 8 L13 12 C13 15.5 11 18 8 18 L7 18 C5 18 4 17 3 15.5 L2 13 C1.5 11 3 10 3 10 Z';
+
+const centred = (path: string, turn = 0): CursorShape => ({ path, hot: { x: 0, y: 0 }, turn });
+
+const SHAPES: Record<string, CursorShape> = {
+  default: { path: ARROW, hot: { x: 0, y: 0 }, turn: 0 },
+  pointer: { path: HAND, hot: { x: 5, y: 0 }, turn: 0 },
+  grab: { path: OPEN_HAND, hot: { x: 7, y: 9 }, turn: 0 },
+  grabbing: { path: FIST, hot: { x: 7, y: 11 }, turn: 0 },
+  move: centred(MOVE),
+  crosshair: centred(CROSS),
+  text: centred(BEAM),
+  'ew-resize': centred(DOUBLE_ARROW),
+  'col-resize': centred(DOUBLE_ARROW),
+  'ns-resize': centred(DOUBLE_ARROW, 90),
+  'row-resize': centred(DOUBLE_ARROW, 90),
+  'nwse-resize': centred(DOUBLE_ARROW, 45),
+  'nesw-resize': centred(DOUBLE_ARROW, -45),
+};
+
+/**
+ * The shape for a CSS `cursor` value as the canvas has it, null for `none`. A value with images
+ * (`url(…) 4 4, pointer`) is read by its keyword at the end; anything unknown is the arrow.
+ */
+export function cursorShape(css: string): CursorShape | null {
+  const keyword = css.split(',').at(-1)!.trim().toLowerCase();
+  if (keyword === 'none') return null;
+  return SHAPES[keyword] ?? SHAPES.default!;
+}
diff --git a/src/core/recording/recording.ts b/src/core/recording/recording.ts
index 86c62d5d..a88da139 100644
--- a/src/core/recording/recording.ts
+++ b/src/core/recording/recording.ts
@@ -80,6 +80,46 @@ function even(value: number): number {
   return Math.max(2, Math.round(value / 2) * 2);
 }
 
+/** The editor is recorded at 60 fps, whatever the screen draws. */
+export const EDITOR_RECORDING_FPS = 60;
+
+/**
+ * The size of an editor recording: the whole canvas in device pixels, an odd row or column cut off,
+ * since the encoders want both sides even.
+ */
+export function editorRecordingSize(canvas: { w: number; h: number }): { w: number; h: number } {
+  const cut = (value: number) => Math.max(2, Math.floor(value / 2) * 2);
+  return { w: cut(canvas.w), h: cut(canvas.h) };
+}
+
+/** How long a recording runs, as the editor shows it: `0:07`, `12:45`, `1:02:03`. */
+export function elapsedText(ms: number): string {
+  const seconds = Math.max(0, Math.floor(ms / 1000));
+  const two = (n: number) => String(n).padStart(2, '0');
+  const h = Math.floor(seconds / 3600);
+  const m = Math.floor(seconds / 60) % 60;
+  const s = seconds % 60;
+  return h > 0 ? `${h}:${two(m)}:${two(s)}` : `${m}:${two(s)}`;
+}
+
+/**
+ * Where the canvas lands in a frame of `frame` size. As it is at the start, it lands where it is,
+ * cut by the odd pixel. A window resized during the recording is fitted in whole and centred, the
+ * rest of the frame left dark.
+ */
+export function fitPicture(
+  canvas: { w: number; h: number },
+  frame: { w: number; h: number },
+): { x: number; y: number; w: number; h: number } {
+  const cutW = canvas.w - frame.w;
+  const cutH = canvas.h - frame.h;
+  if (cutW >= 0 && cutW <= 1 && cutH >= 0 && cutH <= 1) return { x: 0, y: 0, w: canvas.w, h: canvas.h };
+  const scale = Math.min(frame.w / canvas.w, frame.h / canvas.h);
+  const w = Math.round(canvas.w * scale);
+  const h = Math.round(canvas.h * scale);
+  return { x: Math.round((frame.w - w) / 2), y: Math.round((frame.h - h) / 2), w, h };
+}
+
 /** H.264 levels by the frame size and macroblocks a second they allow (ITU-T H.264, table A-1). */
 const AVC_LEVELS: readonly { level: number; frame: number; rate: number }[] = [
   { level: 0x1f, frame: 3600, rate: 108_000 },
diff --git a/src/editor/Editor.ts b/src/editor/Editor.ts
index 060869bf..35a3ceff 100644
--- a/src/editor/Editor.ts
+++ b/src/editor/Editor.ts
@@ -78,7 +78,8 @@ import { TilemapPanel } from './panels/TilemapPanel';
 import { Toolbar } from './panels/Toolbar';
 import { type PlayHost, PlaySession, type WorldSnapshot } from './PlaySession';
 import { type RecordingUpload, RecordingUploads } from './recordingUploads';
-import type { MadeRecording } from '../viewport/GameRecorder';
+import { EditorRecorder } from './EditorRecorder';
+import type { MadeRecording } from '../viewport/RecordingTake';
 import { ProjectSession } from './ProjectSession';
 import { ParticlesEditor } from './particles/ParticlesEditor';
 import { ShaderEditor } from './shader/ShaderEditor';
@@ -321,6 +322,8 @@ export class Editor implements PlayHost {
   fps: number | null = null;
   private readonly play: PlaySession;
   private readonly recordings: RecordingUploads;
+  /** Records the whole editor from the main menu. */
+  private readonly editorRecorder: EditorRecorder;
   private readonly editorRun: EditorRun;
   private readonly projects: ProjectSession;
   private readonly leftColumn: VStack;
@@ -413,6 +416,15 @@ export class Editor implements PlayHost {
     this.inspector = new Inspector(state);
     this.tilemapPanel = new TilemapPanel(state);
     this.recordings = new RecordingUploads({ state, videos });
+    this.editorRecorder = new EditorRecorder({
+      log: (line) => {
+        state.setNotice(line);
+        console.warn('[recording]', line);
+      },
+      saved: (recording) => this.recordings.add(recording),
+      showBadge: (on) => this.toolbar.showRecording(on),
+      badgeRoom: () => this.toolbar.recordingRoom(),
+    });
     this.play = new PlaySession(state, this);
     this.editorRun = new EditorRun(state, {
       // The game view is the one place where no key means anything to the editor, so that is where
@@ -792,13 +804,19 @@ export class Editor implements PlayHost {
   }
 
   /**
-   * The main menu's last group (#179): the user management for an administrator, and the plugins
-   * for everybody – both open the one tab, which holds the plugins below the accounts.
+   * The main menu's last groups: recording the editor, then the user management for an
+   * administrator and the plugins for everybody (#179) – both open the one tab, which holds the
+   * plugins below the accounts.
    */
   private managementEntries(): MenuEntry[] {
     const open = () => this.openDocument('management');
+    const recorder = this.editorRecorder;
     return [
       { separator: true },
+      recorder.isRecording
+        ? { label: 'Stop recording', onSelect: () => recorder.stop() }
+        : { label: 'Start recording', onSelect: () => recorder.start() },
+      { separator: true },
       { label: 'General settings…', onSelect: () => this.openGeneralSettings() },
       ...(this.usersPane ? [{ label: 'User management', onSelect: open }] : []),
       { label: 'Plugins', onSelect: open },
@@ -1323,6 +1341,7 @@ export class Editor implements PlayHost {
     await this.autosave.flush();
     this.autosave.stop();
     if (this.play.isPlaying) this.play.stop();
+    this.editorRecorder.stop();
     this.editorRun.shutDown();
     await this.plugins?.stopAll();
     for (const cleanup of this.cleanups.splice(0).reverse()) cleanup();
@@ -1511,9 +1530,19 @@ export class Editor implements PlayHost {
     };
   }
 
-  /** The recordings of the game view (#405) and what became of them on the way into the project. */
-  recordingInfo(): ReturnType<PlaySession['recordingInfo']> & { uploads: RecordingUpload[] } {
-    return { ...this.play.recordingInfo(), uploads: this.recordings.info() };
+  /**
+   * The recordings of the game view (#405), those of the editor, and what became of them on the way
+   * into the project.
+   */
+  recordingInfo(): ReturnType<PlaySession['recordingInfo']> & {
+    editor: ReturnType<EditorRecorder['info']>;
+    uploads: RecordingUpload[];
+  } {
+    return {
+      ...this.play.recordingInfo(),
+      editor: this.editorRecorder.info(),
+      uploads: this.recordings.info(),
+    };
   }
 
   recordingSaved(recording: MadeRecording): void {
diff --git a/src/editor/EditorRecorder.ts b/src/editor/EditorRecorder.ts
new file mode 100644
index 00000000..23d28114
--- /dev/null
+++ b/src/editor/EditorRecorder.ts
@@ -0,0 +1,281 @@
+import { Container, Graphics, UPDATE_PRIORITY } from 'pixi.js';
+import { cursorShape, type CursorShape } from '../core/recording/cursors';
+import {
+  EDITOR_RECORDING_FPS,
+  editorRecordingSize,
+  elapsedText,
+  fitPicture,
+  recordingName,
+} from '../core/recording/recording';
+import { crispText, renderCount, requestRender, textStyle, Theme, ui } from '../ui';
+import { type FrameSource, Take, type TakeHost, type TakeInfo } from '../viewport/RecordingTake';
+
+/** What the editor recorder needs of the editor. */
+export interface EditorRecorderHost extends TakeHost {
+  /** Makes room in the top bar for the badge while recording, or takes it away. */
+  showBadge(on: boolean): void;
+  /** Where the badge goes, in CSS pixels. */
+  badgeRoom(): { x: number; y: number; w: number; h: number };
+}
+
+/**
+ * Records the whole editor (main menu → Start recording): the canvas as it is on screen, at its size
+ * in device pixels and 60 fps, with the mouse pointer drawn in, since the system draws that over the
+ * canvas. What the editor draws is copied from the canvas right after each render, so recording costs
+ * no second drawing. The badge beside the menu is drawn onto the screen after that copy, so it is
+ * never in the recording.
+ */
+export class EditorRecorder {
+  private take: Take | null = null;
+  private source: CanvasSource | null = null;
+  /** Every recording of this page, newest last (test hook). */
+  private readonly takes: Take[] = [];
+  private seen = -1;
+  private startedAt = 0;
+  private shownText = '';
+  private readonly badge = new RecordingBadge();
+
+  constructor(private readonly host: EditorRecorderHost) {}
+
+  get isRecording(): boolean {
+    return this.take !== null;
+  }
+
+  start(): void {
+    if (this.take) return;
+    const app = ui().app;
+    const source = new CanvasSource(app.canvas);
+    const take = new Take(recordingName('', new Date()), EDITOR_RECORDING_FPS, source, this.host, () => {
+      if (this.take === take) this.end();
+    });
+    this.take = take;
+    this.source = source;
+    this.takes.push(take);
+    this.startedAt = performance.now();
+    this.shownText = '';
+    this.seen = -1;
+    this.host.showBadge(true);
+    // After the render loop (`UPDATE_PRIORITY.LOW`): the canvas holds this tick's picture then.
+    app.ticker.add(this.tick, this, UPDATE_PRIORITY.UTILITY);
+    requestRender();
+  }
+
+  stop(): void {
+    const take = this.take;
+    if (!take) return;
+    this.end();
+    take.finish('');
+  }
+
+  private end(): void {
+    this.take = null;
+    this.source?.detach();
+    this.source = null;
+    ui().app.ticker.remove(this.tick, this);
+    this.host.showBadge(false);
+    requestRender();
+  }
+
+  private tick(): void {
+    const take = this.take;
+    const source = this.source;
+    if (!take || !source) return;
+    const drawn = renderCount();
+    if (drawn !== this.seen) {
+      this.seen = drawn;
+      source.copy();
+      this.drawBadge();
+    }
+    take.capture();
+    // An idle editor draws nothing, and the time beside the menu has to move on.
+    if (elapsedText(performance.now() - this.startedAt) !== this.shownText) requestRender();
+  }
+
+  private drawBadge(): void {
+    this.shownText = elapsedText(performance.now() - this.startedAt);
+    this.badge.show(this.host.badgeRoom(), this.shownText);
+    const app = ui().app;
+    app.renderer.render({ container: this.badge, clear: false });
+    // Pixi hit-tests the pointer against what it drew on screen last: that has to be the stage.
+    (app.renderer as unknown as { _lastObjectRendered: Container })._lastObjectRendered = app.stage;
+  }
+
+  info(): {
+    recording: boolean;
+    takes: TakeInfo[];
+    badge: { x: number; y: number; w: number; h: number } | null;
+  } {
+    return {
+      recording: this.isRecording,
+      takes: this.takes.map((take) => take.info()),
+      badge: this.isRecording ? this.host.badgeRoom() : null,
+    };
+  }
+}
+
+/** The red dot and the time beside the menu while the editor records. */
+class RecordingBadge extends Container {
+  private readonly dot = new Graphics();
+  private readonly time = crispText({ text: '', style: textStyle('body') });
+
+  constructor() {
+    super();
+    this.addChild(this.dot, this.time);
+  }
+
+  show(room: { x: number; y: number; w: number; h: number }, text: string): void {
+    const radius = 5;
+    this.position.set(room.x, room.y);
+    this.dot
+      .clear()
+      .circle(radius + 2, room.h / 2, radius)
+      .fill(Theme.colors.danger);
+    this.time.text = text;
+    this.time.position.set(radius * 2 + 7, Math.round((room.h - this.time.height) / 2));
+  }
+}
+
+/**
+ * The canvas, copied after each render into a picture of the recording's size; a frame is that
+ * picture with the mouse pointer drawn over it.
+ */
+class CanvasSource implements FrameSource {
+  private readonly size: { w: number; h: number };
+  private readonly picture: OffscreenCanvas;
+  private readonly picturePen: OffscreenCanvasRenderingContext2D;
+  private readonly frame: OffscreenCanvas;
+  private readonly framePen: OffscreenCanvasRenderingContext2D;
+  private readonly pointer = new PointerTrack();
+  private readonly paths = new Map<CursorShape, Path2D>();
+  private copied = false;
+  private ready: VideoFrame[] = [];
+
+  constructor(private readonly canvas: HTMLCanvasElement) {
+    this.size = editorRecordingSize({ w: canvas.width, h: canvas.height });
+    this.picture = new OffscreenCanvas(this.size.w, this.size.h);
+    this.picturePen = this.picture.getContext('2d', { alpha: false })!;
+    this.frame = new OffscreenCanvas(this.size.w, this.size.h);
+    this.framePen = this.frame.getContext('2d', { alpha: false })!;
+    this.pointer.attach(canvas);
+  }
+
+  open(): { w: number; h: number } {
+    return this.size;
+  }
+
+  /** The canvas holds what the editor just drew: it becomes the picture. */
+  copy(): void {
+    const { canvas, picturePen: pen } = this;
+    const at = fitPicture({ w: canvas.width, h: canvas.height }, this.size);
+    pen.fillStyle = '#000';
+    pen.fillRect(0, 0, this.size.w, this.size.h);
+    pen.drawImage(canvas, 0, 0, canvas.width, canvas.height, at.x, at.y, at.w, at.h);
+    this.copied = true;
+  }
+
+  holds(): boolean {
+    return !this.copied;
+  }
+
+  get busy(): boolean {
+    return false;
+  }
+
+  get pending(): number {
+    return this.ready.length;
+  }
+
+  take(ms: number): boolean {
+    if (!this.copied) return false;
+    this.framePen.drawImage(this.picture, 0, 0);
+    this.drawPointer();
+    this.ready.push(
+      new VideoFrame(this.frame, {
+        timestamp: Math.round(ms * 1000),
+        duration: Math.round(1e6 / EDITOR_RECORDING_FPS),
+      }),
+    );
+    return true;
+  }
+
+  private drawPointer(): void {
+    const { canvas, pointer } = this;
+    const shape = cursorShape(canvas.style.cursor);
+    if (!pointer.inside || !shape) return;
+    const rect = canvas.getBoundingClientRect();
+    if (rect.width === 0 || rect.height === 0) return;
+    const at = fitPicture({ w: canvas.width, h: canvas.height }, this.size);
+    const x = at.x + ((pointer.x - rect.left) / rect.width) * at.w;
+    const y = at.y + ((pointer.y - rect.top) / rect.height) * at.h;
+    const scale = at.w / rect.width;
+    let path = this.paths.get(shape);
+    if (!path) this.paths.set(shape, (path = new Path2D(shape.path)));
+    const pen = this.framePen;
+    pen.save();
+    pen.translate(x, y);
+    pen.scale(scale, scale);
+    pen.rotate((shape.turn * Math.PI) / 180);
+    pen.translate(-shape.hot.x, -shape.hot.y);
+    pen.lineJoin = 'round';
+    pen.lineWidth = 2;
+    pen.strokeStyle = '#fff';
+    pen.stroke(path);
+    pen.fillStyle = '#000';
+    pen.fill(path);
+    pen.restore();
+  }
+
+  collect(encode: (frame: VideoFrame) => void): void {
+    for (const frame of this.ready.splice(0)) encode(frame);
+  }
+
+  /** The recording ends: the pointer is no longer followed, the frames taken still go out. */
+  detach(): void {
+    this.pointer.detach();
+  }
+
+  close(): void {
+    this.pointer.detach();
+    for (const frame of this.ready.splice(0)) frame.close();
+  }
+}
+
+/** Where the mouse is, in client pixels, and whether it is over the page at all. */
+class PointerTrack {
+  x = 0;
+  y = 0;
+  inside = false;
+  private attached = false;
+
+  private readonly moved = (event: PointerEvent): void => {
+    this.x = event.clientX;
+    this.y = event.clientY;
+    this.inside = true;
+  };
+
+  private readonly left = (): void => {
+    this.inside = false;
+  };
+
+  /** Starts where Pixi last saw the pointer: the click on Start recording put it there. */
+  attach(canvas: HTMLCanvasElement): void {
+    if (this.attached) return;
+    this.attached = true;
+    const rect = canvas.getBoundingClientRect();
+    const at = ui().app.renderer.events.pointer.global;
+    this.x = rect.left + at.x;
+    this.y = rect.top + at.y;
+    this.inside = at.x > 0 || at.y > 0;
+    window.addEventListener('pointermove', this.moved, { capture: true, passive: true });
+    window.addEventListener('pointerdown', this.moved, { capture: true, passive: true });
+    document.documentElement.addEventListener('pointerleave', this.left);
+  }
+
+  detach(): void {
+    if (!this.attached) return;
+    this.attached = false;
+    window.removeEventListener('pointermove', this.moved, { capture: true });
+    window.removeEventListener('pointerdown', this.moved, { capture: true });
+    document.documentElement.removeEventListener('pointerleave', this.left);
+  }
+}
diff --git a/src/editor/PlaySession.ts b/src/editor/PlaySession.ts
index 9d658df2..7330b379 100644
--- a/src/editor/PlaySession.ts
+++ b/src/editor/PlaySession.ts
@@ -17,7 +17,8 @@ import { Input } from '../runtime/systems/Input';
 import type { World } from '../runtime/World';
 import { onFrame, ui } from '../ui';
 import { soundLibrary } from '../viewport/SoundLibrary';
-import { GameRecorder, type MadeRecording } from '../viewport/GameRecorder';
+import { GameRecorder } from '../viewport/GameRecorder';
+import type { MadeRecording } from '../viewport/RecordingTake';
 import { videoLibrary } from '../viewport/VideoLibrary';
 import { FrameMeter, type FrameTimes } from './frameMeter';
 import { saveArea } from './saves';
diff --git a/src/editor/panels/Toolbar.ts b/src/editor/panels/Toolbar.ts
index 2baea181..7d35f9f7 100644
--- a/src/editor/panels/Toolbar.ts
+++ b/src/editor/panels/Toolbar.ts
@@ -27,6 +27,9 @@ const SAVE_LABELS: Record<SaveStatus, string> = {
 /** Square, because an icon has no reading direction that would ask for a wider box. */
 const ICON_BUTTON = Theme.controlHeight;
 
+/** Width beside the menu for the recording's dot and time. */
+const RECORDING_ROOM = 52;
+
 type IconName = keyof typeof TOOLBAR_ICON_SVG;
 
 /**
@@ -46,6 +49,8 @@ function iconButton(name: IconName, onClick: () => void, tooltip: () => string):
 export class Toolbar extends HStack {
   private readonly bg = new Graphics();
   private readonly menuButton: Button;
+  /** The room between the menu and undo; it widens while the editor records (`showRecording`). */
+  private readonly lead = new Spacer(Theme.padding);
   private readonly undoButton: Button;
   private readonly redoButton: Button;
   private readonly playButton: Button;
@@ -74,7 +79,7 @@ export class Toolbar extends HStack {
       });
     this.menuButton = iconButton('menu', () => actions.openMainMenu(this.menuButton), tip('menu'));
     this.add(this.menuButton);
-    this.add(new Spacer(Theme.padding));
+    this.add(this.lead);
     this.undoButton = iconButton('undo', () => state.undo(), tip('undo'));
     this.redoButton = iconButton('redo', () => state.redo(), tip('redo'));
     this.add(this.undoButton);
@@ -132,6 +137,21 @@ export class Toolbar extends HStack {
     };
   }
 
+  /**
+   * Makes room beside the menu for what shows that the editor records, or takes it away again. The
+   * room is left empty here: what fills it is drawn over the screen only, not into the recording.
+   */
+  showRecording(on: boolean): void {
+    this.lead.minWidth = Theme.padding + (on ? RECORDING_ROOM : 0);
+    this.relayout();
+  }
+
+  /** Where that room is on screen, in CSS pixels. */
+  recordingRoom(): { x: number; y: number; w: number; h: number } {
+    const at = this.lead.getGlobalPosition();
+    return { x: at.x, y: this.menuButton.getGlobalPosition().y, w: RECORDING_ROOM, h: this.menuButton.h };
+  }
+
   /** Frame rate readout; `null` while no measurement is available yet. */
   setFps(fps: number | null): void {
     this.fps.setText(fps === null ? '– fps' : `${fps} fps`);
diff --git a/src/editor/recordingUploads.ts b/src/editor/recordingUploads.ts
index b47928e3..2cb867d0 100644
--- a/src/editor/recordingUploads.ts
+++ b/src/editor/recordingUploads.ts
@@ -1,5 +1,5 @@
 import type { UploadedVideo } from '../core/store/VideoStore';
-import type { MadeRecording } from '../viewport/GameRecorder';
+import type { MadeRecording } from '../viewport/RecordingTake';
 import { adoptVideo, type VideoImportDeps } from './videoImport';
 
 /** How often the server is asked whether a recording is converted, as the video picker does. */
@@ -19,7 +19,7 @@ export interface RecordingUpload {
 }
 
 /**
- * Brings a recording of the game view into the project (#405): up to the server, which converts it
+ * Brings a recording of the game view (#405) or of the editor into the project: up to the server, which converts it
  * like any video, then an asset named after the recording once it is ready. Only while the editor
  * is not playing: a run plays a copy of the project that is thrown away, and so would the asset be.
  */
diff --git a/src/viewport/GameRecorder.ts b/src/viewport/GameRecorder.ts
index 2cf14860..20431f52 100644
--- a/src/viewport/GameRecorder.ts
+++ b/src/viewport/GameRecorder.ts
@@ -1,36 +1,16 @@
 import { Matrix, type RenderTexture } from 'pixi.js';
-import { VIDEO_WAIT_MS } from '../core/model/video';
-import { preSkipOf } from '../core/music/ogg';
-import { AVC_CODEC, colourOf, MatroskaWriter, VP9_CODEC } from '../core/recording/matroska';
 import {
-  avcCodec,
-  FrameGate,
-  isKeyFrame,
   pictureTransform,
-  RECORDING_MOST_BYTES,
-  RecordingClock,
   recordingName,
   type RecordingSettings,
   type RecordingSink,
   recordingSize,
-  videoBitrate,
-  vp9Codec,
 } from '../core/recording/recording';
 import { ui } from '../ui';
 import { PictureReader } from './PictureReader';
-import { soundLibrary } from './SoundLibrary';
+import { type FrameSource, Take, type TakeHost, type TakeInfo } from './RecordingTake';
 import type { PictureArea } from './WorldViewport';
 
-const OPUS_BITRATE = 160_000;
-/** Frames the video encoder may have waiting before the next is dropped instead of piling up. */
-const MOST_QUEUED = 6;
-/** Encoded bytes held as loose pieces before they are folded into a Blob, out of the page's heap. */
-const FOLD_BYTES = 16 * 1024 * 1024;
-/** How long a stop waits for the last sound the worklet holds; a suspended context sends none. */
-const LAST_SOUND_MS = 300;
-/** How long a stop waits for the frames still on their way back from the GPU. */
-const LAST_FRAMES_MS = 500;
-
 /** The view a recording takes its frames from (`WorldViewport`). */
 export interface RecordingView {
   picture(): { shown: PictureArea; whole: PictureArea } | null;
@@ -39,49 +19,9 @@ export interface RecordingView {
   missesVideo(): boolean;
 }
 
-/** A recording once it is made. */
-export interface MadeRecording {
-  name: string;
-  blob: Blob;
-  durationMs: number;
-  width: number;
-  height: number;
-}
-
 /** Where the recorder looks, and what it tells. */
-export interface RecordingHost {
+export interface RecordingHost extends TakeHost {
   view(): RecordingView | null;
-  /** A line for the log of the run that plays. */
-  log(line: string): void;
-  saved(recording: MadeRecording): void;
-}
-
-/**
- * `waiting` for a picture to take its size from: `On start` runs before the view is handed the
- * world, and a game may switch its camera on later.
- */
-type TakeState = 'waiting' | 'starting' | 'recording' | 'finishing' | 'done' | 'failed';
-
-/** What a check reads of a recording (test hook). */
-export interface TakeInfo {
-  name: string;
-  state: TakeState;
-  width: number;
-  height: number;
-  fps: number;
-  codec: string;
-  sound: boolean;
-  frames: number;
-  dropped: number;
-  soundFrames: number;
-  /** From the first frame to the end of the last, in ms. */
-  durationMs: number;
-  /** `performance.now()` when the last frame was taken, null before the first. */
-  lastFrameAt: number | null;
-  /** What the video encoder said its colour is, null while it said nothing. */
-  colour: VideoColorSpaceInit | null;
-  bytes: number;
-  failure: string | null;
 }
 
 /**
@@ -104,7 +44,9 @@ export class GameRecorder implements RecordingSink {
   start(settings: RecordingSettings): string {
     if (this.take)
       return `Start recording is ignored: "${this.take.name}" is recording already – Stop recording ends it`;
-    const take = new Take(recordingName(settings.name, new Date()), settings, this.host, () => {
+    const name = recordingName(settings.name, new Date());
+    const source = new ViewSource(name, settings, this.host);
+    const take = new Take(name, settings.fps, source, this.host, () => {
       if (this.take === take) this.take = null;
     });
     this.take = take;
@@ -128,8 +70,7 @@ export class GameRecorder implements RecordingSink {
 
   /** The view has drawn this frame: the recording takes it, if it is due. */
   capture(): void {
-    const view = this.take && this.host.view();
-    if (view) this.take!.capture(view);
+    if (this.host.view()) this.take?.capture();
   }
 
   /** The run is over: a recording still going is saved, not lost. */
@@ -142,429 +83,80 @@ export class GameRecorder implements RecordingSink {
   }
 }
 
-/** One recording, from its encoders to its file. */
-class Take {
-  private state: TakeState = 'waiting';
-  private size = { w: 0, h: 0 };
-  private readonly clock = new RecordingClock();
-  private readonly gate: FrameGate;
-  private video: VideoEncoder | null = null;
-  private audio: AudioEncoder | null = null;
-  private tap: { node: AudioWorkletNode; rate: number; release(): void } | null = null;
-  private writer: MatroskaWriter | null = null;
-  private codec = '';
-  private videoHead: Uint8Array | null = null;
-  private colour: VideoColorSpaceInit | null = null;
-  private audioHead: Uint8Array | null = null;
+/**
+ * The game view, drawn into a texture of the recording's size and read back from the GPU
+ * (`PictureReader`): the frames come out a tick or two after they are taken.
+ */
+class ViewSource implements FrameSource {
   private reader: PictureReader | null = null;
+  private size = { w: 0, h: 0 };
   private toldNoCamera = false;
-  private folded: Blob[] = [];
-  private loose: Uint8Array[] = [];
-  private looseBytes = 0;
-  private frames = 0;
-  private dropped = 0;
-  private lastMs = 0;
-  private soundFrames = 0;
-  /** The recording's time of the first sample heard, in ms; null before it. */
-  private soundStart: number | null = null;
-  private soundEnded: (() => void) | null = null;
-  private stopAsked = false;
-  private paused = false;
-  private held = false;
-  /** Since when the view lacks a video, see `holdForVideo`; null while it lacks none. */
-  private heldSince: number | null = null;
-  private lastFrameAt: number | null = null;
-  private failure: string | null = null;
 
   constructor(
-    readonly name: string,
+    private readonly name: string,
     private readonly settings: RecordingSettings,
     private readonly host: RecordingHost,
-    private readonly gone: () => void,
-  ) {
-    this.gate = new FrameGate(settings.fps);
-  }
+  ) {}
 
-  /**
-   * Takes the size from the first picture there is and sets up the encoders; until they are ready
-   * frames are not taken, and a stop asked meanwhile ends it after.
-   */
-  private open(picture: { shown: PictureArea; whole: PictureArea }): void {
-    const ratio = ui().app.renderer.resolution;
-    const device = (area: PictureArea) => ({ w: area.w * ratio, h: area.h * ratio });
-    this.size = recordingSize(this.settings.resolution, device(picture.shown), device(picture.whole));
-    this.state = 'starting';
-    try {
-      this.reader = new PictureReader(this.size.w, this.size.h);
-    } catch (error) {
-      this.fail(error instanceof Error ? error.message : String(error));
-      return;
-    }
-    void this.openEncoders().then(
-      () => {
-        if (this.state !== 'starting') return;
-        this.state = 'recording';
-        if (this.stopAsked) this.finish('');
-      },
-      (error: unknown) => this.fail(error instanceof Error ? error.message : String(error)),
-    );
-  }
-
-  private async openEncoders(): Promise<void> {
-    if (typeof VideoEncoder === 'undefined')
-      throw new Error('this browser cannot encode video – recording needs Chrome');
-    const { w, h } = this.size;
-    const fps = this.settings.fps;
-    const base = { width: w, height: h, framerate: fps, bitrate: videoBitrate(w, h, fps) };
-    const configs: VideoEncoderConfig[] = [
-      { ...base, codec: avcCodec(w, h, fps), avc: { format: 'avc' }, latencyMode: 'realtime' },
-      { ...base, codec: vp9Codec(w, h), latencyMode: 'realtime' },
-    ];
-    let config: VideoEncoderConfig | null = null;
-    for (const candidate of configs)
-      if (
-        await VideoEncoder.isConfigSupported(candidate).then(
-          (s) => s.supported === true,
-          () => false,
-        )
-      ) {
-        config = candidate;
-        break;
-      }
-    if (!config) throw new Error(`this browser cannot encode ${w}x${h} at ${fps} fps`);
-    this.codec = config.codec;
-    await this.openSound();
-    const writer = new MatroskaWriter(this.audio ? 2 : 1);
-    this.writer = writer;
-    const video = new VideoEncoder({
-      output: (chunk, meta) => {
-        const head = meta?.decoderConfig?.description;
-        if (head && !this.videoHead) this.videoHead = copyOf(head);
-        this.colour ??= meta?.decoderConfig?.colorSpace ?? null;
-        writer.add(1, chunk.timestamp, chunk.type === 'key', chunkBytes(chunk));
-        this.collect();
-      },
-      error: (error) => this.fail(error.message),
-    });
-    video.configure(config);
-    this.video = video;
-  }
-
-  /** The master behind the limiter, as Opus; without it the recording goes on silent and says so. */
-  private async openSound(): Promise<void> {
-    const tap = await soundLibrary.outputTap().catch(() => null);
-    const config: AudioEncoderConfig = {
-      codec: 'opus',
-      sampleRate: tap?.rate ?? 48000,
-      numberOfChannels: 2,
-      bitrate: OPUS_BITRATE,
-    };
-    const supported =
-      tap !== null &&
-      typeof AudioEncoder !== 'undefined' &&
-      (await AudioEncoder.isConfigSupported(config).then(
-        (s) => s.supported === true,
-        () => false,
-      ));
-    if (!tap || !supported) {
-      tap?.release();
-      this.host.log(`Recording "${this.name}" has no sound: this browser cannot record it`);
-      return;
-    }
-    const audio = new AudioEncoder({
-      output: (chunk, meta) => {
-        const head = meta?.decoderConfig?.description;
-        if (head && !this.audioHead) this.audioHead = copyOf(head);
-        this.writer?.add(2, chunk.timestamp, true, chunkBytes(chunk));
-        this.collect();
-      },
-      error: (error) => this.fail(error.message),
-    });
-    audio.configure(config);
-    this.audio = audio;
-    this.tap = tap;
-    tap.node.port.onmessage = (event: MessageEvent<Float32Array[]>) => this.heard(event.data);
-  }
-
-  setPaused(paused: boolean): void {
-    this.stand(() => (this.paused = paused));
-  }
-
-  /**
-   * A frame that lacks a video is not taken (#417): a composition's clock stands until its video has
-   * its picture, and the frames meanwhile were empty where the video goes. Like a pause, but the game
-   * plays on, so what it sounds then is left out too. At most `VIDEO_WAIT_MS` at a stretch, as long
-   * as the composition waits.
-   */
-  private holdForVideo(view: RecordingView): void {
-    const now = performance.now();
-    if (view.missesVideo()) this.heldSince ??= now;
-    else this.heldSince = null;
-    const held = this.heldSince !== null && now - this.heldSince < VIDEO_WAIT_MS;
-    this.stand(() => (this.held = held));
-  }
-
-  /** The clock stands while paused or held, whichever came first and whichever ends last. */
-  private stand(change: () => void): void {
-    const was = this.standing;
-    change();
-    if (this.standing === was) return;
-    const now = performance.now();
-    if (this.standing) this.clock.pause(now);
-    else this.clock.resume(now);
-  }
-
-  private get standing(): boolean {
-    return this.paused || this.held;
-  }
-
-  capture(view: RecordingView): void {
-    if (this.state === 'waiting') {
-      const picture = view.picture();
-      if (picture) this.open(picture);
-      else if (!this.toldNoCamera) {
+  open(): { w: number; h: number } | null {
+    const picture = this.host.view()?.picture();
+    if (!picture) {
+      if (!this.toldNoCamera) {
         this.toldNoCamera = true;
         this.host.log(
           `Recording "${this.name}" waits: no camera is switched on, so there is nothing to record`,
         );
       }
-      return;
-    }
-    const video = this.video;
-    const reader = this.reader;
-    if (this.state !== 'recording' || !video || !reader) return;
-    reader.collect((bytes, ms) => this.encode(bytes, ms));
-    // A frame taken may have reached the most a file holds and ended the recording.
-    if (!this.taking) return;
-    this.holdForVideo(view);
-    if (this.standing) return;
-    const now = performance.now();
-    if (!this.clock.started) this.clock.start(now);
-    const ms = this.clock.at(now);
-    if (!this.gate.take(ms)) return;
-    const picture = view.picture();
-    if (!picture || reader.busy || video.encodeQueueSize >= MOST_QUEUED) {
-      this.dropped++;
-      return;
+      return null;
     }
+    const ratio = ui().app.renderer.resolution;
+    const device = (area: PictureArea) => ({ w: area.w * ratio, h: area.h * ratio });
+    this.size = recordingSize(this.settings.resolution, device(picture.shown), device(picture.whole));
+    this.reader = new PictureReader(this.size.w, this.size.h);
+    return this.size;
+  }
+
+  holds(): boolean {
+    return this.host.view()?.missesVideo() ?? false;
+  }
+
+  get busy(): boolean {
+    return this.reader?.busy ?? true;
+  }
+
+  get pending(): number {
+    return this.reader?.pending ?? 0;
+  }
+
+  take(ms: number): boolean {
+    const view = this.host.view();
+    const picture = view?.picture();
+    if (!view || !picture || !this.reader) return false;
     const m = pictureTransform(
       this.settings.resolution === 'view' ? picture.shown : picture.whole,
       this.size,
     );
-    view.drawPicture(new Matrix(m.a, 0, 0, m.d, m.tx, m.ty), reader.texture);
-    reader.read(ms);
-    this.lastFrameAt = now;
+    view.drawPicture(new Matrix(m.a, 0, 0, m.d, m.tx, m.ty), this.reader.texture);
+    this.reader.read(ms);
+    return true;
   }
 
-  private get taking(): boolean {
-    return this.state === 'recording';
-  }
-
-  /** A frame back from the GPU, into the video encoder. */
-  private encode(bytes: Uint8Array, ms: number): void {
-    const video = this.video;
-    if (!video || video.state !== 'configured') return;
-    const frame = new VideoFrame(bytes, {
-      format: 'RGBX',
-      codedWidth: this.size.w,
-      codedHeight: this.size.h,
-      timestamp: Math.round(ms * 1000),
-      duration: Math.round(1e6 / this.settings.fps),
-    });
-    video.encode(frame, { keyFrame: isKeyFrame(this.frames, this.settings.fps) });
-    frame.close();
-    this.frames++;
-    this.lastMs = ms;
-    if (this.taking && (this.writer?.bytes ?? 0) > RECORDING_MOST_BYTES)
-      this.finish(`Recording "${this.name}" reached 2 GB, the most the server takes, and was stopped`);
-  }
-
-  /** A piece of the master from the worklet; an empty one is the last. */
-  private heard(sides: Float32Array[]): void {
-    const audio = this.audio;
-    const frames = sides[0]?.length ?? 0;
-    if (frames === 0) {
-      this.soundEnded?.();
-      return;
-    }
-    // Before the first frame there is no time to put it at. Pieces keep coming during a pause only
-    // as long as they were on their way, so they belong before it and are kept. A hold leaves them
-    // out: the game plays on meanwhile.
-    if (!audio || !this.tap || this.state !== 'recording' || !this.clock.started || this.held) return;
-    const rate = this.tap.rate;
-    this.soundStart ??= Math.max(0, this.clock.at(performance.now()) - (frames / rate) * 1000);
-    const planar = new Float32Array(frames * 2);
-    planar.set(sides[0]!, 0);
-    planar.set(sides[1] ?? sides[0]!, frames);
-    const data = new AudioData({
-      format: 'f32-planar',
-      sampleRate: rate,
-      numberOfFrames: frames,
-      numberOfChannels: 2,
-      timestamp: Math.round(this.soundStart * 1000 + (this.soundFrames / rate) * 1e6),
-      data: planar,
-    });
-    audio.encode(data);
-    data.close();
-    this.soundFrames += frames;
-  }
-
-  /** Ends the recording and saves what it has; `why` goes to the log when it is not the node's stop. */
-  finish(why: string): void {
-    if (why) this.host.log(why);
-    if (this.state === 'waiting') {
-      this.state = 'done';
-      this.gone();
-      this.host.log(`Recording "${this.name}" ended before its first frame, so nothing was saved`);
-      return;
-    }
-    if (this.state === 'starting') {
-      this.stopAsked = true;
-      return;
-    }
-    if (this.state !== 'recording') return;
-    this.state = 'finishing';
-    this.gone();
-    void this.save().catch((error: unknown) =>
-      this.fail(error instanceof Error ? error.message : String(error)),
+  collect(encode: (frame: VideoFrame) => void): void {
+    this.reader?.collect((bytes, ms) =>
+      encode(
+        new VideoFrame(bytes, {
+          format: 'RGBX',
+          codedWidth: this.size.w,
+          codedHeight: this.size.h,
+          timestamp: Math.round(ms * 1000),
+          duration: Math.round(1e6 / this.settings.fps),
+        }),
+      ),
     );
   }
 
-  private async save(): Promise<void> {
-    await Promise.all([this.lastFrames(), this.lastSound()]);
-    if (this.video?.state === 'configured') await this.video.flush();
-    if (this.audio?.state === 'configured') await this.audio.flush();
-    this.close();
-    const writer = this.writer;
-    if (!writer || this.frames === 0) {
-      this.state = 'done';
-      this.host.log(`Recording "${this.name}" ended before its first frame, so nothing was saved`);
-      return;
-    }
-    const frame = 1000 / this.settings.fps;
-    const { head, rest } = writer.finish({
-      video: {
-        codec: this.codec.startsWith('avc1') ? AVC_CODEC : VP9_CODEC,
-        width: this.size.w,
-        height: this.size.h,
-        private: this.videoHead,
-        fps: this.settings.fps,
-        colour: colourOf(this.colour),
-      },
-      audio: this.audio
-        ? {
-            channels: 2,
-            private: this.audioHead,
-            preSkip: preSkipOf(this.audioHead ?? new Uint8Array()) ?? 0,
-          }
-        : null,
-      durationMs: this.lastMs + frame,
-      app: 'game-maker',
-    });
-    this.collect();
-    const blob = new Blob([head, ...this.folded, ...this.loose, ...rest] as BlobPart[], {
-      type: 'video/x-matroska',
-    });
-    this.folded = [];
-    this.loose = [];
-    this.state = 'done';
-    this.host.saved({
-      name: this.name,
-      blob,
-      durationMs: this.lastMs + frame,
-      width: this.size.w,
-      height: this.size.h,
-    });
-  }
-
-  /** Takes the frames still on their way back from the GPU, a moment at most. */
-  private async lastFrames(): Promise<void> {
-    const until = performance.now() + LAST_FRAMES_MS;
-    for (;;) {
-      this.reader?.collect((bytes, ms) => this.encode(bytes, ms));
-      if (!this.reader?.pending || performance.now() > until) return;
-      await new Promise((resolve) => setTimeout(resolve, 4));
-    }
-  }
-
-  /** Asks the worklet for what it still holds and waits for it, a moment at most. */
-  private lastSound(): Promise<void> {
-    const tap = this.tap;
-    if (!tap) return Promise.resolve();
-    return new Promise<void>((resolve) => {
-      const timer = setTimeout(done, LAST_SOUND_MS);
-      function done(): void {
-        clearTimeout(timer);
-        resolve();
-      }
-      this.soundEnded = done;
-      tap.node.port.postMessage('stop');
-    }).finally(() => {
-      tap.release();
-      this.tap = null;
-    });
-  }
-
-  /** Moves the clusters the writer finished into the file, folding them into Blobs as they pile up. */
-  private collect(): void {
-    for (const part of this.writer?.take() ?? []) {
-      this.loose.push(part);
-      this.looseBytes += part.length;
-    }
-    if (this.looseBytes < FOLD_BYTES) return;
-    this.folded.push(new Blob(this.loose as BlobPart[]));
-    this.loose = [];
-    this.looseBytes = 0;
-  }
-
-  private close(): void {
-    for (const encoder of [this.video, this.audio])
-      if (encoder && encoder.state !== 'closed') encoder.close();
+  close(): void {
     this.reader?.destroy();
     this.reader = null;
   }
-
-  private fail(reason: string): void {
-    if (this.state === 'done' || this.state === 'failed') return;
-    this.failure = reason;
-    this.state = 'failed';
-    this.tap?.release();
-    this.tap = null;
-    this.close();
-    this.gone();
-    this.host.log(`Recording "${this.name}" failed: ${reason}`);
-  }
-
-  info(): TakeInfo {
-    return {
-      name: this.name,
-      state: this.state,
-      width: this.size.w,
-      height: this.size.h,
-      fps: this.settings.fps,
-      codec: this.codec,
-      sound: this.audio !== null,
-      frames: this.frames,
-      dropped: this.dropped,
-      soundFrames: this.soundFrames,
-      durationMs: this.frames > 0 ? Math.round(this.lastMs + 1000 / this.settings.fps) : 0,
-      lastFrameAt: this.lastFrameAt,
-      colour: this.colour,
-      bytes: this.writer?.bytes ?? 0,
-      failure: this.failure,
-    };
-  }
-}
-
-function chunkBytes(chunk: EncodedVideoChunk | EncodedAudioChunk): Uint8Array {
-  const data = new Uint8Array(chunk.byteLength);
-  chunk.copyTo(data);
-  return data;
-}
-
-function copyOf(source: AllowSharedBufferSource): Uint8Array {
-  const view = ArrayBuffer.isView(source)
-    ? new Uint8Array(source.buffer, source.byteOffset, source.byteLength)
-    : new Uint8Array(source);
-  return view.slice();
 }
diff --git a/src/viewport/RecordingTake.ts b/src/viewport/RecordingTake.ts
new file mode 100644
index 00000000..7d386e34
--- /dev/null
+++ b/src/viewport/RecordingTake.ts
@@ -0,0 +1,498 @@
+import { VIDEO_WAIT_MS } from '../core/model/video';
+import { preSkipOf } from '../core/music/ogg';
+import { AVC_CODEC, colourOf, MatroskaWriter, VP9_CODEC } from '../core/recording/matroska';
+import {
+  avcCodec,
+  FrameGate,
+  isKeyFrame,
+  RECORDING_MOST_BYTES,
+  RecordingClock,
+  videoBitrate,
+  vp9Codec,
+} from '../core/recording/recording';
+import { soundLibrary } from './SoundLibrary';
+
+const OPUS_BITRATE = 160_000;
+/** Frames the video encoder may have waiting before the next is dropped instead of piling up. */
+const MOST_QUEUED = 6;
+/** Encoded bytes held as loose pieces before they are folded into a Blob, out of the page's heap. */
+const FOLD_BYTES = 16 * 1024 * 1024;
+/** How long a stop waits for the last sound the worklet holds; a suspended context sends none. */
+const LAST_SOUND_MS = 300;
+/** How long a stop waits for the frames still on their way to the encoder. */
+const LAST_FRAMES_MS = 500;
+
+/** A recording once it is made. */
+export interface MadeRecording {
+  name: string;
+  blob: Blob;
+  durationMs: number;
+  width: number;
+  height: number;
+}
+
+/** What a take tells. */
+export interface TakeHost {
+  /** A line for whoever started it: the log of the run, or the editor's notice. */
+  log(line: string): void;
+  saved(recording: MadeRecording): void;
+}
+
+/**
+ * Where a take gets its pictures: the game view (`GameRecorder`) or the whole editor
+ * (`EditorRecorder`).
+ */
+export interface FrameSource {
+  /**
+   * The size of the frames, even on both sides, and gets ready to take them; null while there is
+   * no picture to take the size from. Throws when it cannot take any.
+   */
+  open(): { w: number; h: number } | null;
+  /** Whether the picture now lacks something still loading (#417): the frame is not taken. */
+  holds(): boolean;
+  /** Whether a frame taken now would have nowhere to go. */
+  readonly busy: boolean;
+  /** Frames taken that `collect` has not handed over yet. */
+  readonly pending: number;
+  /** Takes the picture now as the frame of recording time `ms`; false when there was none. */
+  take(ms: number): boolean;
+  /** Hands over the frames ready to encode, oldest first; whoever takes one closes it. */
+  collect(encode: (frame: VideoFrame) => void): void;
+  close(): void;
+}
+
+/**
+ * `waiting` for a picture to take its size from: `On start` runs before the view is handed the
+ * world, and a game may switch its camera on later.
+ */
+type TakeState = 'waiting' | 'starting' | 'recording' | 'finishing' | 'done' | 'failed';
+
+/** What a check reads of a recording (test hook). */
+export interface TakeInfo {
+  name: string;
+  state: TakeState;
+  width: number;
+  height: number;
+  fps: number;
+  codec: string;
+  sound: boolean;
+  frames: number;
+  dropped: number;
+  soundFrames: number;
+  /** From the first frame to the end of the last, in ms. */
+  durationMs: number;
+  /** `performance.now()` when the last frame was taken, null before the first. */
+  lastFrameAt: number | null;
+  /** What the video encoder said its colour is, null while it said nothing. */
+  colour: VideoColorSpaceInit | null;
+  bytes: number;
+  failure: string | null;
+}
+
+/** One recording, from its encoders to its file (#405). */
+export class Take {
+  private state: TakeState = 'waiting';
+  private size = { w: 0, h: 0 };
+  private readonly clock = new RecordingClock();
+  private readonly gate: FrameGate;
+  private video: VideoEncoder | null = null;
+  private audio: AudioEncoder | null = null;
+  private tap: { node: AudioWorkletNode; rate: number; release(): void } | null = null;
+  private writer: MatroskaWriter | null = null;
+  private codec = '';
+  private videoHead: Uint8Array | null = null;
+  private colour: VideoColorSpaceInit | null = null;
+  private audioHead: Uint8Array | null = null;
+  private folded: Blob[] = [];
+  private loose: Uint8Array[] = [];
+  private looseBytes = 0;
+  private frames = 0;
+  private dropped = 0;
+  private lastMs = 0;
+  private soundFrames = 0;
+  /** The recording's time of the first sample heard, in ms; null before it. */
+  private soundStart: number | null = null;
+  private soundEnded: (() => void) | null = null;
+  private stopAsked = false;
+  private paused = false;
+  private held = false;
+  /** Since when the source holds, see `holdForVideo`; null while it does not. */
+  private heldSince: number | null = null;
+  private lastFrameAt: number | null = null;
+  private failure: string | null = null;
+
+  constructor(
+    readonly name: string,
+    private readonly fps: number,
+    private readonly source: FrameSource,
+    private readonly host: TakeHost,
+    private readonly gone: () => void,
+  ) {
+    this.gate = new FrameGate(fps);
+  }
+
+  /**
+   * Takes the size from the first picture there is and sets up the encoders; until they are ready
+   * frames are not taken, and a stop asked meanwhile ends it after.
+   */
+  private open(): void {
+    let size: { w: number; h: number } | null;
+    try {
+      size = this.source.open();
+    } catch (error) {
+      this.fail(error instanceof Error ? error.message : String(error));
+      return;
+    }
+    if (!size) return;
+    this.size = size;
+    this.state = 'starting';
+    void this.openEncoders().then(
+      () => {
+        if (this.state !== 'starting') return;
+        this.state = 'recording';
+        if (this.stopAsked) this.finish('');
+      },
+      (error: unknown) => this.fail(error instanceof Error ? error.message : String(error)),
+    );
+  }
+
+  private async openEncoders(): Promise<void> {
+    if (typeof VideoEncoder === 'undefined')
+      throw new Error('this browser cannot encode video – recording needs Chrome');
+    const { w, h } = this.size;
+    const fps = this.fps;
+    const base = { width: w, height: h, framerate: fps, bitrate: videoBitrate(w, h, fps) };
+    const configs: VideoEncoderConfig[] = [
+      { ...base, codec: avcCodec(w, h, fps), avc: { format: 'avc' }, latencyMode: 'realtime' },
+      { ...base, codec: vp9Codec(w, h), latencyMode: 'realtime' },
+    ];
+    let config: VideoEncoderConfig | null = null;
+    for (const candidate of configs)
+      if (
+        await VideoEncoder.isConfigSupported(candidate).then(
+          (s) => s.supported === true,
+          () => false,
+        )
+      ) {
+        config = candidate;
+        break;
+      }
+    if (!config) throw new Error(`this browser cannot encode ${w}x${h} at ${fps} fps`);
+    this.codec = config.codec;
+    await this.openSound();
+    const writer = new MatroskaWriter(this.audio ? 2 : 1);
+    this.writer = writer;
+    const video = new VideoEncoder({
+      output: (chunk, meta) => {
+        const head = meta?.decoderConfig?.description;
+        if (head && !this.videoHead) this.videoHead = copyOf(head);
+        this.colour ??= meta?.decoderConfig?.colorSpace ?? null;
+        writer.add(1, chunk.timestamp, chunk.type === 'key', chunkBytes(chunk));
+        this.collect();
+      },
+      error: (error) => this.fail(error.message),
+    });
+    video.configure(config);
+    this.video = video;
+  }
+
+  /** The master behind the limiter, as Opus; without it the recording goes on silent and says so. */
+  private async openSound(): Promise<void> {
+    const tap = await soundLibrary.outputTap().catch(() => null);
+    const config: AudioEncoderConfig = {
+      codec: 'opus',
+      sampleRate: tap?.rate ?? 48000,
+      numberOfChannels: 2,
+      bitrate: OPUS_BITRATE,
+    };
+    const supported =
+      tap !== null &&
+      typeof AudioEncoder !== 'undefined' &&
+      (await AudioEncoder.isConfigSupported(config).then(
+        (s) => s.supported === true,
+        () => false,
+      ));
+    if (!tap || !supported) {
+      tap?.release();
+      this.host.log(`Recording "${this.name}" has no sound: this browser cannot record it`);
+      return;
+    }
+    const audio = new AudioEncoder({
+      output: (chunk, meta) => {
+        const head = meta?.decoderConfig?.description;
+        if (head && !this.audioHead) this.audioHead = copyOf(head);
+        this.writer?.add(2, chunk.timestamp, true, chunkBytes(chunk));
+        this.collect();
+      },
+      error: (error) => this.fail(error.message),
+    });
+    audio.configure(config);
+    this.audio = audio;
+    this.tap = tap;
+    tap.node.port.onmessage = (event: MessageEvent<Float32Array[]>) => this.heard(event.data);
+  }
+
+  setPaused(paused: boolean): void {
+    this.stand(() => (this.paused = paused));
+  }
+
+  /**
+   * A frame that lacks a video is not taken (#417): a composition's clock stands until its video has
+   * its picture, and the frames meanwhile were empty where the video goes. Like a pause, but the game
+   * plays on, so what it sounds then is left out too. At most `VIDEO_WAIT_MS` at a stretch, as long
+   * as the composition waits.
+   */
+  private holdForVideo(): void {
+    const now = performance.now();
+    if (this.source.holds()) this.heldSince ??= now;
+    else this.heldSince = null;
+    const held = this.heldSince !== null && now - this.heldSince < VIDEO_WAIT_MS;
+    this.stand(() => (this.held = held));
+  }
+
+  /** The clock stands while paused or held, whichever came first and whichever ends last. */
+  private stand(change: () => void): void {
+    const was = this.standing;
+    change();
+    if (this.standing === was) return;
+    const now = performance.now();
+    if (this.standing) this.clock.pause(now);
+    else this.clock.resume(now);
+  }
+
+  private get standing(): boolean {
+    return this.paused || this.held;
+  }
+
+  /** The picture is drawn for this frame: the take takes it, if it is due. */
+  capture(): void {
+    if (this.state === 'waiting') {
+      this.open();
+      return;
+    }
+    const video = this.video;
+    if (this.state !== 'recording' || !video) return;
+    this.source.collect((frame) => this.encode(frame));
+    // A frame taken may have reached the most a file holds and ended the recording.
+    if (!this.taking) return;
+    this.holdForVideo();
+    if (this.standing) return;
+    const now = performance.now();
+    if (!this.clock.started) this.clock.start(now);
+    const ms = this.clock.at(now);
+    if (!this.gate.take(ms)) return;
+    if (this.source.busy || video.encodeQueueSize >= MOST_QUEUED || !this.source.take(ms)) {
+      this.dropped++;
+      return;
+    }
+    this.lastFrameAt = now;
+  }
+
+  private get taking(): boolean {
+    return this.state === 'recording';
+  }
+
+  /** A frame from the source, into the video encoder. */
+  private encode(frame: VideoFrame): void {
+    const video = this.video;
+    if (!video || video.state !== 'configured') {
+      frame.close();
+      return;
+    }
+    video.encode(frame, { keyFrame: isKeyFrame(this.frames, this.fps) });
+    this.lastMs = frame.timestamp / 1000;
+    frame.close();
+    this.frames++;
+    if (this.taking && (this.writer?.bytes ?? 0) > RECORDING_MOST_BYTES)
+      this.finish(`Recording "${this.name}" reached 2 GB, the most the server takes, and was stopped`);
+  }
+
+  /** A piece of the master from the worklet; an empty one is the last. */
+  private heard(sides: Float32Array[]): void {
+    const audio = this.audio;
+    const frames = sides[0]?.length ?? 0;
+    if (frames === 0) {
+      this.soundEnded?.();
+      return;
+    }
+    // Before the first frame there is no time to put it at. Pieces keep coming during a pause only
+    // as long as they were on their way, so they belong before it and are kept. A hold leaves them
+    // out: the game plays on meanwhile.
+    if (!audio || !this.tap || this.state !== 'recording' || !this.clock.started || this.held) return;
+    const rate = this.tap.rate;
+    this.soundStart ??= Math.max(0, this.clock.at(performance.now()) - (frames / rate) * 1000);
+    const planar = new Float32Array(frames * 2);
+    planar.set(sides[0]!, 0);
+    planar.set(sides[1] ?? sides[0]!, frames);
+    const data = new AudioData({
+      format: 'f32-planar',
+      sampleRate: rate,
+      numberOfFrames: frames,
+      numberOfChannels: 2,
+      timestamp: Math.round(this.soundStart * 1000 + (this.soundFrames / rate) * 1e6),
+      data: planar,
+    });
+    audio.encode(data);
+    data.close();
+    this.soundFrames += frames;
+  }
+
+  /** Ends the recording and saves what it has; `why` goes to the log when it is not the node's stop. */
+  finish(why: string): void {
+    if (why) this.host.log(why);
+    if (this.state === 'waiting') {
+      this.state = 'done';
+      this.close();
+      this.gone();
+      this.host.log(`Recording "${this.name}" ended before its first frame, so nothing was saved`);
+      return;
+    }
+    if (this.state === 'starting') {
+      this.stopAsked = true;
+      return;
+    }
+    if (this.state !== 'recording') return;
+    this.state = 'finishing';
+    this.gone();
+    void this.save().catch((error: unknown) =>
+      this.fail(error instanceof Error ? error.message : String(error)),
+    );
+  }
+
+  private async save(): Promise<void> {
+    await Promise.all([this.lastFrames(), this.lastSound()]);
+    if (this.video?.state === 'configured') await this.video.flush();
+    if (this.audio?.state === 'configured') await this.audio.flush();
+    this.close();
+    const writer = this.writer;
+    if (!writer || this.frames === 0) {
+      this.state = 'done';
+      this.host.log(`Recording "${this.name}" ended before its first frame, so nothing was saved`);
+      return;
+    }
+    const frame = 1000 / this.fps;
+    const { head, rest } = writer.finish({
+      video: {
+        codec: this.codec.startsWith('avc1') ? AVC_CODEC : VP9_CODEC,
+        width: this.size.w,
+        height: this.size.h,
+        private: this.videoHead,
+        fps: this.fps,
+        colour: colourOf(this.colour),
+      },
+      audio: this.audio
+        ? {
+            channels: 2,
+            private: this.audioHead,
+            preSkip: preSkipOf(this.audioHead ?? new Uint8Array()) ?? 0,
+          }
+        : null,
+      durationMs: this.lastMs + frame,
+      app: 'game-maker',
+    });
+    this.collect();
+    const blob = new Blob([head, ...this.folded, ...this.loose, ...rest] as BlobPart[], {
+      type: 'video/x-matroska',
+    });
+    this.folded = [];
+    this.loose = [];
+    this.state = 'done';
+    this.host.saved({
+      name: this.name,
+      blob,
+      durationMs: this.lastMs + frame,
+      width: this.size.w,
+      height: this.size.h,
+    });
+  }
+
+  /** Takes the frames still on their way to the encoder, a moment at most. */
+  private async lastFrames(): Promise<void> {
+    const until = performance.now() + LAST_FRAMES_MS;
+    for (;;) {
+      this.source.collect((frame) => this.encode(frame));
+      if (!this.source.pending || performance.now() > until) return;
+      await new Promise((resolve) => setTimeout(resolve, 4));
+    }
+  }
+
+  /** Asks the worklet for what it still holds and waits for it, a moment at most. */
+  private lastSound(): Promise<void> {
+    const tap = this.tap;
+    if (!tap) return Promise.resolve();
+    return new Promise<void>((resolve) => {
+      const timer = setTimeout(done, LAST_SOUND_MS);
+      function done(): void {
+        clearTimeout(timer);
+        resolve();
+      }
+      this.soundEnded = done;
+      tap.node.port.postMessage('stop');
+    }).finally(() => {
+      tap.release();
+      this.tap = null;
+    });
+  }
+
+  /** Moves the clusters the writer finished into the file, folding them into Blobs as they pile up. */
+  private collect(): void {
+    for (const part of this.writer?.take() ?? []) {
+      this.loose.push(part);
+      this.looseBytes += part.length;
+    }
+    if (this.looseBytes < FOLD_BYTES) return;
+    this.folded.push(new Blob(this.loose as BlobPart[]));
+    this.loose = [];
+    this.looseBytes = 0;
+  }
+
+  private close(): void {
+    for (const encoder of [this.video, this.audio])
+      if (encoder && encoder.state !== 'closed') encoder.close();
+    this.source.close();
+  }
+
+  private fail(reason: string): void {
+    if (this.state === 'done' || this.state === 'failed') return;
+    this.failure = reason;
+    this.state = 'failed';
+    this.tap?.release();
+    this.tap = null;
+    this.close();
+    this.gone();
+    this.host.log(`Recording "${this.name}" failed: ${reason}`);
+  }
+
+  info(): TakeInfo {
+    return {
+      name: this.name,
+      state: this.state,
+      width: this.size.w,
+      height: this.size.h,
+      fps: this.fps,
+      codec: this.codec,
+      sound: this.audio !== null,
+      frames: this.frames,
+      dropped: this.dropped,
+      soundFrames: this.soundFrames,
+      durationMs: this.frames > 0 ? Math.round(this.lastMs + 1000 / this.fps) : 0,
+      lastFrameAt: this.lastFrameAt,
+      colour: this.colour,
+      bytes: this.writer?.bytes ?? 0,
+      failure: this.failure,
+    };
+  }
+}
+
+function chunkBytes(chunk: EncodedVideoChunk | EncodedAudioChunk): Uint8Array {
+  const data = new Uint8Array(chunk.byteLength);
+  chunk.copyTo(data);
+  return data;
+}
+
+function copyOf(source: AllowSharedBufferSource): Uint8Array {
+  const view = ArrayBuffer.isView(source)
+    ? new Uint8Array(source.buffer, source.byteOffset, source.byteLength)
+    : new Uint8Array(source);
+  return view.slice();
+}
diff --git a/tests/core/recording.test.ts b/tests/core/recording.test.ts
index 591b70ba..6c1a763b 100644
--- a/tests/core/recording.test.ts
+++ b/tests/core/recording.test.ts
@@ -1,6 +1,10 @@
 import { describe, expect, it } from 'vitest';
+import { cursorShape } from '../../src/core/recording/cursors';
 import {
   avcCodec,
+  editorRecordingSize,
+  elapsedText,
+  fitPicture,
   FrameGate,
   isKeyFrame,
   pictureTransform,
@@ -138,3 +142,36 @@ describe('the recording nodes', () => {
     expect(ctx.recordings).toEqual(['stop']);
   });
 });
+
+describe('recording the editor', () => {
+  it('records the whole canvas, an odd row or column cut off', () => {
+    expect(editorRecordingSize({ w: 2560, h: 1369 })).toEqual({ w: 2560, h: 1368 });
+    expect(editorRecordingSize({ w: 1281, h: 721 })).toEqual({ w: 1280, h: 720 });
+  });
+
+  it('puts the canvas where it is while its size is the one it started with', () => {
+    expect(fitPicture({ w: 1281, h: 720 }, { w: 1280, h: 720 })).toEqual({ x: 0, y: 0, w: 1281, h: 720 });
+  });
+
+  it('fits a resized window in whole and centres it', () => {
+    expect(fitPicture({ w: 1000, h: 720 }, { w: 1280, h: 720 })).toEqual({ x: 140, y: 0, w: 1000, h: 720 });
+    expect(fitPicture({ w: 2560, h: 720 }, { w: 1280, h: 720 })).toEqual({ x: 0, y: 180, w: 1280, h: 360 });
+  });
+
+  it('shows the time it runs in minutes and seconds, hours once there are any', () => {
+    expect(elapsedText(0)).toBe('0:00');
+    expect(elapsedText(7999)).toBe('0:07');
+    expect(elapsedText(765_000)).toBe('12:45');
+    expect(elapsedText(3_723_000)).toBe('1:02:03');
+  });
+
+  it('draws the pointer the canvas shows, the arrow for what it does not know', () => {
+    expect(cursorShape('')).toBe(cursorShape('default'));
+    expect(cursorShape('inherit')).toBe(cursorShape('default'));
+    expect(cursorShape('ew-resize')).toEqual(cursorShape('col-resize'));
+    expect(cursorShape('ns-resize')!.turn).toBe(90);
+    expect(cursorShape('url(a.png) 4 4, grab')).toBe(cursorShape('grab'));
+    expect(cursorShape('grab')).not.toBe(cursorShape('default'));
+    expect(cursorShape('none')).toBeNull();
+  });
+});
diff --git a/tools/e2e/46-topbar.mjs b/tools/e2e/46-topbar.mjs
index e16e7d87..136dec0d 100644
--- a/tools/e2e/46-topbar.mjs
+++ b/tools/e2e/46-topbar.mjs
@@ -61,11 +61,13 @@ export async function topbar(t) {
     'Master routing',
     'Clear saved data',
     null,
+    'Start recording',
+    null,
     'General settings…',
     'Plugins',
   ];
   check(
-    'the menu button opens new project, the project picker, the settings, the master routing, clearing saves, the general settings and the plugins',
+    'the menu button opens new project, the project picker, the settings, the master routing, clearing saves, recording the editor, the general settings and the plugins',
     JSON.stringify(rows) === JSON.stringify(expected),
     JSON.stringify(rows),
   );
diff --git a/tools/e2e/67-recording.mjs b/tools/e2e/67-recording.mjs
index b3f8c29c..642cb5a2 100644
--- a/tools/e2e/67-recording.mjs
+++ b/tools/e2e/67-recording.mjs
@@ -174,9 +174,162 @@ export async function recording(t) {
     colors,
   );
 
+  // 67e. The editor records itself from the main menu: the whole canvas at 60 fps, the mouse pointer
+  //      drawn in where the system draws it over the canvas, and the red dot beside the menu on
+  //      screen only. The frame is read where the pointer rested on the empty middle of the top bar.
+  const { mouse, cdp, clickToolbar, clickText } = t;
+  await clickToolbar('menu');
+  const idle = await json('__gm.menuRows()');
+  await clickText('Start recording');
+  await waitUntil(`__gm.recording().editor.takes[0]?.state === 'recording'`, { label: 'the editor records' });
+  const redo = await json('__gm.toolbarAt("redo")');
+  const playAt = await json('__gm.toolbarAt("play")');
+  const rest = { x: Math.round((redo.x + playAt.x) / 2), y: Math.round(playAt.y) };
+  await mouse('mouseMoved', rest.x, rest.y);
+  await sleep(200);
+  const restFrom = (await json('__gm.recording().editor.takes[0]')).durationMs;
+  await sleep(1000);
+  const restTo = (await json('__gm.recording().editor.takes[0]')).durationMs;
+  const canvas = await json(
+    "({ w: document.querySelector('canvas').width, h: document.querySelector('canvas').height })",
+  );
+  // Points of the canvas below the top bar, whose notice changes, while the editor rests: the frame
+  // of that moment has to show the same. Only points amid one colour count: H.264 shares a colour
+  // between 2×2 pixels, so a hairline over red comes out pink.
+  const near = [];
+  for (let gy = 1; gy < 14; gy++)
+    for (let gx = 1; gx < 24; gx++) {
+      const x = Math.round((canvas.w * gx) / 24);
+      const y = 40 + Math.round(((canvas.h - 40) * gy) / 14);
+      for (let dy = -2; dy <= 2; dy += 2)
+        for (let dx = -2; dx <= 2; dx += 2) near.push({ x: x + dx, y: y + dy });
+    }
+  const around = await json(`__gm.pixels(${JSON.stringify(near)})`);
+  const grid = [];
+  const live = [];
+  for (let i = 0; i < near.length; i += 9) {
+    const patch = around.slice(i, i + 9);
+    if (patch.every((c) => c === patch[0])) {
+      grid.push(near[i + 4]);
+      live.push(patch[4]);
+    }
+  }
+  const badge = (await json('__gm.recording().editor')).badge;
+  const dot = { x: Math.round(badge.x + 7), y: Math.round(badge.y + badge.h / 2) };
+  await evaluate('window.__gm.wake()');
+  await sleep(100);
+  const { data: screen } = await cdp.send('Page.captureScreenshot', { format: 'png' });
+  const onScreen = JSON.parse(
+    await evaluate(`new Promise((resolve) => {
+      const image = new Image();
+      image.onload = () => {
+        const canvas = document.createElement('canvas');
+        canvas.width = image.width;
+        canvas.height = image.height;
+        const pen = canvas.getContext('2d');
+        pen.drawImage(image, 0, 0);
+        resolve(JSON.stringify([...pen.getImageData(${dot.x}, ${dot.y}, 1, 1).data].slice(0, 3)));
+      };
+      image.src = 'data:image/png;base64,${screen}';
+    })`),
+  );
+  await clickToolbar('menu');
+  const busy = await json('__gm.menuRows()');
+  await clickText('Stop recording');
+  await waitUntil(`__gm.recording().editor.takes[0]?.state === 'done'`, {
+    label: 'the editor take is saved',
+  });
+  const take = (await json('__gm.recording().editor')).takes[0];
+  await waitUntil(
+    `__gm.recording().uploads.some((u) => u.name === ${JSON.stringify(take.name)} && (u.state === 'added' || u.state === 'failed'))`,
+    { timeout: 60_000, label: 'the editor recording is in the project' },
+  );
+  const upload = (await recordings()).uploads.find((u) => u.name === take.name);
+  const made = await json(
+    `__gm.state.project.assets.filter((a) => a.id === ${JSON.stringify(upload.assetId)}).map((a) => ({ file: a.file, fps: a.fps }))[0] ?? null`,
+  );
+  const file = made?.file ?? '';
+  const at = (restFrom + restTo) / 2000;
+  const frame = JSON.parse(
+    await evaluate(`new Promise((resolve) => {
+      const video = document.createElement('video');
+      video.muted = true;
+      video.onerror = () => resolve('null');
+      video.src = '/game-maker/data/videos/${file}';
+      video.play().then(() => video.requestVideoFrameCallback(() => {
+        video.pause();
+        video.onseeked = () => setTimeout(() => {
+          const canvas = document.createElement('canvas');
+          canvas.width = video.videoWidth;
+          canvas.height = video.videoHeight;
+          const pen = canvas.getContext('2d');
+          pen.drawImage(video, 0, 0);
+          const px = (x, y) => [...pen.getImageData(x, y, 1, 1).data].slice(0, 3);
+          resolve(JSON.stringify({
+            w: canvas.width,
+            h: canvas.height,
+            inside: px(${rest.x + 2}, ${rest.y + 8}),
+            beside: px(${rest.x - 4}, ${rest.y + 8}),
+            dot: px(${dot.x}, ${dot.y}),
+            grid: ${JSON.stringify(grid)}.map((p) => px(p.x, p.y)),
+          }));
+        }, 150);
+        video.currentTime = ${at};
+      }), () => resolve('null'));
+    })`),
+  );
+  const hex = (rgb) => rgb.map((v) => v.toString(16).padStart(2, '0')).join('');
+  const off = frame
+    ? frame.grid.filter((rgb, i) => {
+        const want = live[i]
+          .slice(1)
+          .match(/../g)
+          .map((v) => parseInt(v, 16));
+        return rgb.some((v, c) => Math.abs(v - want[c]) > 24);
+      }).length
+    : -1;
+  check(
+    'Start recording in the main menu records the whole editor at 60 fps with the pointer drawn in, the red dot on screen only, and Stop recording saves it',
+    idle.includes('Start recording') &&
+      busy.includes('Stop recording') &&
+      take.width === canvas.w - (canvas.w % 2) &&
+      take.height === canvas.h - (canvas.h % 2) &&
+      take.fps === 60 &&
+      made?.fps === 60 &&
+      upload.state === 'added' &&
+      frame !== null &&
+      frame.w === take.width &&
+      Math.max(...frame.inside) < 60 &&
+      Math.min(...frame.beside) > 25 &&
+      onScreen[0] > 180 &&
+      onScreen[1] < 120 &&
+      frame.dot[0] < 120 &&
+      grid.length >= 50 &&
+      off <= grid.length / 20,
+    JSON.stringify({
+      idle,
+      busy,
+      take,
+      made,
+      upload,
+      canvas,
+      at,
+      onScreen,
+      frame: frame && {
+        ...frame,
+        inside: hex(frame.inside),
+        beside: hex(frame.beside),
+        dot: hex(frame.dot),
+        grid: undefined,
+      },
+      flat: grid.length,
+      off,
+    }),
+  );
+
   await mutate(`
     const p = __gm.state.project;
-    const made = ${JSON.stringify(assets.map((a) => a.id))};
+    const made = ${JSON.stringify([...assets.map((a) => a.id), upload.assetId])};
     p.assets = p.assets.filter((a) => a.id !== '${CONTROL}' && !made.includes(a.id));
     const scene = __gm.state.activeScene;
     scene.objects = scene.objects.filter((o) => !o.id.startsWith('rc67-'));`);