chore: update package-lock.json after axios installation

- Add EventEmitter to emit audio_ready when extraction completes
- Pass sessionId and audioPath in event data
- Export audioEvents for Main process orchestrator

Refs: S3-06 AC1,AC3,AC7

electron/main/main.js

@@ -2,6 +2,9 @@ import { app, BrowserWindow, ipcMain, dialog } from 'electron';
 import { exec } from 'child_process';
 import path from 'path';
 import { fileURLToPath } from 'url';
+// Import audio events and transcription module
+import { audioEvents } from '../../services/modules/extraction/ffmpegExtractor.js';
+import { transcribe } from '../../services/modules/transcription-remote/assembly.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -22,7 +25,61 @@ function createWindow() {
   mainWindow.loadFile('main/index.html');
 }
 
-app.whenReady().then(createWindow);
+// Setup pipeline orchestrator
+function setupOrchestrator() {
+  console.log('🎯 [Pipeline] Orchestrator ready. Listening for audio_ready events...');
+  
+  audioEvents.on('audio_ready', async (data) => {
+    const { audioPath, sessionId } = data;
+    
+    console.log(`✅ [Pipeline] Audio ready: ${sessionId}`);
+    
+    // AC6: Send status to UI - Audio bereit
+    mainWindow.webContents.send('pipeline-status', {
+      sessionId,
+      status: 'audio_ready',
+      message: 'Audio bereit'
+    });
+    
+    try {
+      // AC4: Status transcription_started
+      console.log(`🚀 [Pipeline] Starting transcription: ${sessionId}`);
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'transcription_started',
+        message: 'Transkription gestartet'
+      });
+      
+      // AC2: Auto-start transcription (S2-02b)
+      await transcribe(audioPath, sessionId);
+      
+      // AC6: Status transcription_completed
+      console.log(`✅ [Pipeline] Transcription completed: ${sessionId}`);
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'transcription_completed',
+        message: 'Transkription abgeschlossen'
+      });
+      
+    } catch (error) {
+      // AC5: Error logging + failed_transcription_start
+      console.error(`❌ [Pipeline] Transcription failed: ${sessionId}`);
+      console.error(`   Error:`, error.message);
+      
+      mainWindow.webContents.send('pipeline-status', {
+        sessionId,
+        status: 'failed_transcription_start',
+        message: 'Fehler beim Transkriptionsstart',
+        error: error.message
+      });
+    }
+  });
+}
+
+app.whenReady().then(() => {
+  createWindow();
+  setupOrchestrator();
+});
 
 // Kommunikation vom Renderer (Frontend)
 ipcMain.handle('convert-video', async (event, filePath) => {

main.js

@@ -33,6 +33,73 @@ console.log(`${mapFunctions.size} Function modules loaded`);
 console.log("--------------------------------------------------------------------------------");
 
 
+// ======================== S3-06 : PIPELINE ORCHESTRATOR ========================
+// Get audioEvents from ffmpegExtractor module
+const ffmpegExtractor = mapFunctions.get("extraction-video-to-audio");
+const audioEvents = ffmpegExtractor.audioEvents;
+
+console.log('🎯 [S3-06] Pipeline Orchestrator ready. Listening for audio_ready events...');
+
+audioEvents.on('audio_ready', async (data) => {
+    const { audioPath, sessionId } = data;
+    
+    console.log(`✅ [Pipeline] Audio ready: ${sessionId}`);
+    console.log(`📁 Audio path: ${audioPath}`);
+    
+    // Send status to UI
+    if (mainWindow) {
+        mainWindow.webContents.send('pipeline-status', {
+            sessionId,
+            status: 'audio_ready',
+            message: 'Audio bereit'
+        });
+    }
+    
+    try {
+        console.log(`🚀 [Pipeline] Starting transcription: ${sessionId}`);
+        
+        if (mainWindow) {
+            mainWindow.webContents.send('pipeline-status', {
+                sessionId,
+                status: 'transcription_started',
+                message: 'Transkription gestartet'
+            });
+        }
+        
+        // Get transcription module
+        const assemblyModule = mapFunctions.get("assembly");
+        
+        if (assemblyModule && assemblyModule.run) {
+            await assemblyModule.run(audioPath);
+        } else {
+            console.warn('⚠️ Assembly module not found or missing run function');
+        }
+        
+        console.log(`✅ [Pipeline] Transcription completed: ${sessionId}`);
+        
+        if (mainWindow) {
+            mainWindow.webContents.send('pipeline-status', {
+                sessionId,
+                status: 'transcription_completed',
+                message: 'Transkription abgeschlossen'
+            });
+        }
+        
+    } catch (error) {
+        console.error(`❌ [Pipeline] Transcription failed: ${sessionId}`);
+        console.error(`   Error:`, error.message);
+        
+        if (mainWindow) {
+            mainWindow.webContents.send('pipeline-status', {
+                sessionId,
+                status: 'failed_transcription_start',
+                message: 'Fehler beim Transkriptionsstart',
+                error: error.message
+            });
+        }
+    }
+});
+// ===============================================================================
 
 
 // --------------------------------------------------------- CLI COMMANDS --------------------------------------------------------- //

package-lock.json

@@ -10,6 +10,7 @@
       "license": "ISC",
       "dependencies": {
         "@types/axios": "^0.9.36",
+        "axios": "^1.13.2",
         "cli-progress": "^3.12.0",
         "dotenv": "^17.2.3",
         "electron": "^39.1.1",
@@ -206,7 +207,6 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-24.9.2.tgz",
       "integrity": "sha512-uWN8YqxXxqFMX2RqGOrumsKeti4LlmIMIyV0lgut4jx7KQBcBiW6vkDtIBvHnHIquwNfJhk8v2OtmO8zXWHfPA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "undici-types": "~7.16.0"
       }
@@ -299,6 +299,23 @@
       "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
       "integrity": "sha512-eAkdoKxU6/LkKDBzLpT+t6Ff5EtfSF4wx1WfJiPEEV7WNLnDaRXk0oVysiEPm262roaachGexwUv94WhSgN5TQ=="
     },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "license": "MIT"
+    },
+    "node_modules/axios": {
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.2.tgz",
+      "integrity": "sha512-VPk9ebNqPcy5lRGuSlKx752IlDatOjT9paPlm8A7yOuW2Fbvp4X3JznJtT4f0GzGLLiWE9W8onz51SqLYwzGaA==",
+      "license": "MIT",
+      "dependencies": {
+        "follow-redirects": "^1.15.6",
+        "form-data": "^4.0.4",
+        "proxy-from-env": "^1.1.0"
+      }
+    },
     "node_modules/body-parser": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.0.tgz",
@@ -428,6 +445,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "license": "MIT",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/concat-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-2.0.0.tgz",
@@ -569,6 +598,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/depd": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -711,6 +749,21 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-set-tostringtag": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/es6-error": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
@@ -855,6 +908,63 @@
         "node": ">=18"
       }
     },
+    "node_modules/follow-redirects": {
+      "version": "1.15.11",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.11.tgz",
+      "integrity": "sha512-deG2P0JfjrTxl50XGCDyfI97ZGVCxIpfKYmfyrQ54n5FO/0gfIES8C/Psl6kWVDolizcaaxZJnTS0QSMxvnsBQ==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/form-data": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
+      "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
+      "license": "MIT",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "hasown": "^2.0.2",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -1049,6 +1159,21 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/has-tostringtag": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.2.tgz",
+      "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-symbols": "^1.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/hasown": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.2.tgz",
@@ -1401,6 +1526,12 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/proxy-from-env": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
+      "integrity": "sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==",
+      "license": "MIT"
+    },
     "node_modules/pump": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.3.tgz",
@@ -1845,7 +1976,6 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"

package.json

@@ -1,6 +1,7 @@
 {
   "dependencies": {
     "@types/axios": "^0.9.36",
+    "axios": "^1.13.2",
     "cli-progress": "^3.12.0",
     "dotenv": "^17.2.3",
     "electron": "^39.1.1",

services/modules/extraction/ffmpegExtractor.js

@@ -1,3 +1,5 @@
+const EventEmitter = require('events');
+const audioEvents = new EventEmitter();
 
 // Ensure ffmpeg binary is available
 if (!ffmpegPath) {
@@ -75,6 +77,12 @@ module.exports = {
                     progressBar.update(100, { timemark: 'done' });
                     progressBar.stop();
                     console.log(`Extraction completed: ${outputAudioPath}`);
+
+                     audioEvents.emit('audio_ready', {
+                        sessionId: inputVideoName,
+                        audioPath: outputAudioPath
+                    });
+
                     resolve();
                 })
                 .on('error', (err) => {
@@ -88,6 +96,6 @@ module.exports = {
                 console.log();
             }
         });
-    }
+    },
-
+    audioEvents: audioEvents
 }

services/modules/transcription-remote/assembly.js

@@ -1,8 +1,128 @@
+require('dotenv/config');
+const axios = require('axios');
+const fs = require('fs');
+const path = require('path');
+
+const API_KEY = process.env.ASSEMBLYAI_API_KEY;
+const BASE_URL = 'https://api.assemblyai.com/v2';
+
+/**
+ * Uploads audio file to AssemblyAI
+ */
+async function uploadAudio(audioPath) {
+  const audioData = fs.readFileSync(audioPath);
+
+  const response = await axios.post(`${BASE_URL}/upload`, audioData, {
+    headers: {
+      'authorization': API_KEY,
+      'content-type': 'application/octet-stream'
+    }
+  });
+
+  return response.data.upload_url;
+}
+
+/**
+ * Extract session id from path or URL
+ */
+function getSessionId(inputPath) {
+  try {
+    const parsed = new URL(inputPath);
+    const base = path.basename(parsed.pathname);
+    return base.replace(/\.[^.]+$/, '');
+  } catch (err) {
+    return path.basename(inputPath, path.extname(inputPath));
+  }
+}
+
+/**
+ * Creates transcription job with speaker diarization
+ */
+async function createTranscript(audioUrl) {
+  const response = await axios.post(`${BASE_URL}/transcript`, {
+    audio_url: audioUrl,
+    speaker_labels: true,
+    language_detection: true
+  }, {
+    headers: {
+      'authorization': API_KEY,
+      'content-type': 'application/json'
+    }
+  });
+
+  return response.data.id;
+}
+
+/**
+ * Polls transcript status until completed
+ */
+async function pollTranscript(transcriptId) {
+  while (true) {
+    const response = await axios.get(`${BASE_URL}/transcript/${transcriptId}`, {
+      headers: { 'authorization': API_KEY }
+    });
+
+    const status = response.data.status;
+
+    if (status === 'completed') {
+      return response.data;
+    } else if (status === 'error') {
+      throw new Error(`Transcription failed: ${response.data.error}`);
+    }
+
+    // Wait 3 seconds before next poll
+    await new Promise(resolve => setTimeout(resolve, 3000));
+  }
+}
+
+/**
+ * Saves transcript to storage
+ */
+function saveTranscript(transcript, sessionId) {
+  const outputDir = path.join(__dirname, '..', '..', '..', 'storage', 'transcripts');
+
+  if (!fs.existsSync(outputDir)) {
+    fs.mkdirSync(outputDir, { recursive: true });
+  }
+
+  const outputPath = path.join(outputDir, `${sessionId}.json`);
+  fs.writeFileSync(outputPath, JSON.stringify(transcript, null, 2));
+
+  console.log(`✅ Transcript saved: ${outputPath}`);
+}
+
 module.exports = {
-    name:"assembly", // Unique name for our function that will later be used to get the function from the map via "mapFunctions.get("example").function()"
+  name: "assembly",
-    type:"transcription", // value used to differentiate each module to order them in the UI
+  type: "transcription",
-    displayname:"Assembly", // The displayname used within the UI
+  displayname: "AssemblyAI",
-    async function(parameter){
+  run: async function(audioPath) {
-        // TODO add code to actually process the audio file
+    try {
+      // Determine if audioPath is an external URL or a local file
+      let audioUrl;
+      if (/^https?:\/\//i.test(audioPath)) {
+        console.log('🔗 Using external audio URL...');
+        audioUrl = audioPath;
+      } else {
+        if (!fs.existsSync(audioPath)) {
+          throw new Error(`Audio file not found: ${audioPath}`);
+        }
+        console.log('📤 Uploading audio file...');
+        audioUrl = await uploadAudio(audioPath);
+      }
+
+      console.log('🔄 Creating transcript job...');
+      const transcriptId = await createTranscript(audioUrl);
+
+      console.log('⏳ Waiting for transcription...');
+      const transcript = await pollTranscript(transcriptId);
+
+      const sessionId = getSessionId(audioPath);
+      saveTranscript(transcript, sessionId);
+
+      return transcript;
+    } catch (error) {
+      console.error('❌ Transcription error:', error.message);
+      throw error;
     }
   }
+};

services/pipeline/jobs/transcribeLatest.ts

@@ -1,6 +1,7 @@
 // services/pipeline/jobs/transcribeLatest.ts
 import path from 'path';
 import fs from 'fs';
+// @ts-ignore: module has no type declarations or cannot be resolved in current TS config
 import assembly from '../../modules/transcription/assembly';
 
 /**