From 8487e723d4aadb4c25083215a2562830022df23d Mon Sep 17 00:00:00 2001
From: ValueOn AG <p.motsch@valueon.ch>
Date: Tue, 17 Feb 2026 23:29:25 +0100
Subject: [PATCH] fix: disable camera and remove Y4M fake video to prevent
 browser crash when audio flows

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 src/bot/orchestrator.ts | 65 ++++++++++++-----------------------------
 1 file changed, 18 insertions(+), 47 deletions(-)

diff --git a/src/bot/orchestrator.ts b/src/bot/orchestrator.ts
index 828ae4f..8b0f9db 100644
--- a/src/bot/orchestrator.ts
+++ b/src/bot/orchestrator.ts
@@ -3,7 +3,6 @@ import { Logger } from 'winston';
 import { v4 as uuidv4 } from 'uuid';
 import path from 'path';
 import fs from 'fs';
-import os from 'os';
 import WebSocket from 'ws';
 
 import { config } from '../config';
@@ -17,37 +16,8 @@ import { ChatProcedure, ChatMessageEntry } from './chatProcedure';
 import { AuthProcedure } from './authProcedure';
 import { isValidMeetingUrl } from './meetingUrlParser';
 
-/**
- * Generate a solid-white Y4M video file for use as fake camera input.
- * Chromium loops this single frame at 30fps, so participants see a static white image.
- * Later this can be replaced with a custom image (avatar/background).
- */
-function _generateFakeVideoFile(): string {
-  const width = 1280;
-  const height = 720;
-  const filePath = path.join(os.tmpdir(), 'bot-video-white.y4m');
-
-  if (fs.existsSync(filePath)) return filePath;
-
-  const header = `YUV4MPEG2 W${width} H${height} F30:1 Ip A0:0 C420jpeg\n`;
-  const frameHeader = 'FRAME\n';
-
-  // White in YUV: Y=235, U=128, V=128
-  const yPlane = Buffer.alloc(width * height, 235);
-  const uvSize = (width / 2) * (height / 2);
-  const uPlane = Buffer.alloc(uvSize, 128);
-  const vPlane = Buffer.alloc(uvSize, 128);
-
-  const fd = fs.openSync(filePath, 'w');
-  fs.writeSync(fd, header);
-  fs.writeSync(fd, frameHeader);
-  fs.writeSync(fd, yPlane);
-  fs.writeSync(fd, uPlane);
-  fs.writeSync(fd, vPlane);
-  fs.closeSync(fd);
-
-  return filePath;
-}
+// Camera / fake video injection is disabled for now to focus on stability.
+// The Y4M fake video file was causing browser crashes when audio started flowing.
 
 export interface OrchestratorCallbacks {
   onStateChange: (state: BotState, message?: string) => void;
@@ -189,9 +159,6 @@ export class BotOrchestrator {
     // Dismiss any post-join permission modals (e.g. "Manage windows on all displays")
     await this._joinProcedure!.dismissBrowserPermissionModals();
 
-    // Verify camera is on in the meeting
-    await this._ensureCameraOnInMeeting();
-
     // Initialize audio playback
     await this._audioProcedure!.initialize();
 
@@ -309,8 +276,8 @@ export class BotOrchestrator {
       await this._takeScreenshot('auth-no-join-now');
     }
 
-    // Activate camera toggle if it's off (so background image is visible)
-    await this._ensureCameraOn();
+    // Camera stays OFF — no video injection, focus on communication stability
+    this._logger.info('Camera left OFF (video disabled for stability)');
 
     await this._page!.waitForTimeout(2000);
 
@@ -347,9 +314,6 @@ export class BotOrchestrator {
     // Start keepalive to prevent idle disconnect
     this._startKeepAlive();
 
-    // Verify camera is on in the meeting
-    await this._ensureCameraOnInMeeting();
-
     // Initialize audio playback
     await this._audioProcedure!.initialize();
 
@@ -803,22 +767,15 @@ export class BotOrchestrator {
   private async _launchBrowser(authMode: boolean = false): Promise<void> {
     this._logger.info(`Launching browser (authMode=${authMode})...`);
 
-    // Generate a solid white Y4M video file so participants see a clean image
-    const fakeVideoPath = _generateFakeVideoFile();
-    this._logger.info(`Fake video file: ${fakeVideoPath}`);
-
     const args = authMode
       ? [
-          // Chromium Minimal: only --no-sandbox + fake media (proven to work for authenticated join)
           '--no-sandbox',
           '--use-fake-ui-for-media-stream',
           '--use-fake-device-for-media-stream',
-          `--use-file-for-fake-video-capture=${fakeVideoPath}`,
         ]
       : [
           '--use-fake-ui-for-media-stream',
           '--use-fake-device-for-media-stream',
-          `--use-file-for-fake-video-capture=${fakeVideoPath}`,
           '--disable-web-security',
           '--disable-features=IsolateOrigins,site-per-process',
           '--autoplay-policy=no-user-gesture-required',
@@ -933,6 +890,20 @@ export class BotOrchestrator {
       }
     });
 
+    // Handle browser renderer crash (Chromium process segfault)
+    this._page.on('crash', () => {
+      this._logger.error('BROWSER CRASH: Chromium renderer process crashed!');
+      this._setState('error', 'Browser crashed');
+    });
+
+    // Handle browser disconnection (entire browser process dies)
+    this._browser.on('disconnected', () => {
+      if (!this._isShuttingDown) {
+        this._logger.error('BROWSER DISCONNECTED: Browser process died unexpectedly');
+        this._setState('error', 'Browser process died');
+      }
+    });
+
     this._logger.info('Browser launched');
   }