Implemented local transcription solution with starting scripts

services/modules/extraction/ffmpegExtractor.ts

@@ -3,32 +3,36 @@ import ffmpeg from 'fluent-ffmpeg';
 import path from 'path';
 import fs from 'fs';
 import cliProgress from 'cli-progress';
+import { fileURLToPath } from 'url';
 
 // Base code reference: https://docs.yemreak.com/arsiv/programming/extract-audio-from-video-with-typescript-and-ffmpeg
-// Test command: npx ts-node ffmpegExtractor.ts /path/to/video.mp4
+// Test command: npx ts-node ./extract.ts /path/to/video.mp4
 
 /**
  * Extracts audio from a video file and saves it as WAV.
  * @param videoFilePath Path to the input video file.
- * @param outputAudioPath Path where the output WAV audio will be saved.
  */
 
 // Ensure ffmpeg binary is available
 if (!ffmpegPath) {
-    throw new Error('FFmpeg binary not found!');
+  throw new Error('FFmpeg binary not found!');
 }
 ffmpeg.setFfmpegPath(ffmpegPath);
 
 // Ensure an input video path is provided via CLI
 if (process.argv.length < 3) {
-    console.error('Usage: ts-node ffmpegExtractor.ts <input-video-path>');
-    process.exit(1);
+  console.error('Usage: ts-node ./extract.ts <input-video-path>');
+  process.exit(1);
 }
 
-// Prepare output directory (always relative to project root)
-const outputDir = path.join(process.cwd(), 'storage', 'audio');
+// Resolve __dirname equivalent in ESM
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Prepare output directory (always storage/audio under project root)
+const outputDir = path.join(__dirname, '..', '..', 'storage', 'audio');
 if (!fs.existsSync(outputDir)) {
-    fs.mkdirSync(outputDir, { recursive: true });
+  fs.mkdirSync(outputDir, { recursive: true });
 }
 
 // Derive input and output paths
@@ -38,10 +42,10 @@ const outputAudioPath = path.join(outputDir, `${inputVideoName}.wav`);
 
 // Initialize CLI progress bar
 const progressBar = new cliProgress.SingleBar({
-    format: 'Processing |{bar}| {percentage}% | {timemark}',
-    barCompleteChar: '\u2588',
-    barIncompleteChar: '\u2591',
-    hideCursor: true
+  format: 'Processing |{bar}| {percentage}% | {timemark}',
+  barCompleteChar: '\u2588',
+  barIncompleteChar: '\u2591',
+  hideCursor: true
 });
 
 /**
@@ -50,34 +54,37 @@ const progressBar = new cliProgress.SingleBar({
  * - Shows CLI progress bar
  * - Handles errors gracefully (without errors)
  */
-function extractAudioFromVideo(videoFilePath: string, outputAudioPath: string): Promise<void> {
-    return new Promise((resolve, reject) => {
-        ffmpeg(videoFilePath)
-            .outputFormat('wav') // Set output format to WAV
-            .on('progress', (progress) => {
-                // Start progress bar if not already active
-                if (!progressBar.isActive) progressBar.start(100, 0, { timemark: '00:00:00' });
-                if (progress.percent) {
-                    progressBar.update(progress.percent, { timemark: progress.timemark });
-                }
-            })
-            .on('end', () => {
-                // Finish progress bar
-                progressBar.update(100, { timemark: 'done' });
-                progressBar.stop();
-                console.log(`Extraction completed: ${outputAudioPath}`);
-                resolve();
-            })
-            .on('error', (err) => {
-                // Show extraction errors in a clear format
-                console.error(`failed_audio_extraction: ${err.message}`);
-                reject(err);
-            })
-            .save(outputAudioPath); // Save output file
-    });
+export function extractAudioFromVideo(videoFilePath: string): Promise<void> {
+  return new Promise((resolve, reject) => {
+    ffmpeg(videoFilePath)
+      .outputFormat('wav')
+      .audioCodec('pcm_s16le')
+      .audioChannels(1)
+      .audioFrequency(16000)
+      .on('progress', (progress) => {
+        if (!progressBar.isActive) progressBar.start(100, 0, { timemark: '00:00:00' });
+        if (progress.percent) {
+          progressBar.update(progress.percent, { timemark: progress.timemark });
+        }
+      })
+      .on('end', () => {
+        progressBar.update(100, { timemark: 'done' });
+        progressBar.stop();
+        console.log(`Extraction completed: ${outputAudioPath}`);
+        resolve();
+      })
+      .on('error', (err) => {
+        progressBar.stop();
+        console.error(`failed_audio_extraction: ${err.message}`);
+        reject(err);
+      })
+      .save(outputAudioPath);
+  });
 }
 
-// Run extraction
-extractAudioFromVideo(inputVideoPath, outputAudioPath)
+// Run extraction if executed directly from CLI
+if (import.meta.url === `file://${process.argv[1]}`) {
+  extractAudioFromVideo(inputVideoPath)
     .then(() => console.log('Audio extraction successful.'))
-    .catch((err) => console.error(err));
+    .catch((err) => console.error(err));
+}