Implemented first working version of the ffmpeg audio extractor

2026-06-15 18:01:52 +02:00 · 2025-11-02 17:43:08 +01:00
parent 816f0ec6e7
commit 461998cd66
4 changed files with 657 additions and 0 deletions
@@ -0,0 +1,74 @@
+import ffmpegPath from 'ffmpeg-static';
+import ffmpeg from 'fluent-ffmpeg';
+import path from 'path';
+import fs from 'fs';
+import cliProgress from 'cli-progress';
+// Source for the base code: https://docs.yemreak.com/arsiv/programming/extract-audio-from-video-with-typescript-and-ffmpeg
+// Testfile command: npx ts-node /Users/mikehughes/PROJ/video2document/services/modules/extraction/ffmpegExtractor.ts  /Users/mikehughes/Downloads/sweetHomeAlabama.mp4
+/**
+ * Extracts audio from a video file and saves it as an wav file.
+ * @param videoFilePath - The path to the video file.
+ * @param outputAudioPath - The path where the extracted audio file should be saved.
+ */
+// If the ffmpeg binary is not found, throw an error 
+if (!ffmpegPath) {
+    throw new Error('FFmpeg binary not found!');
+}
+ffmpeg.setFfmpegPath(ffmpegPath);
+
+// If the input video path is not provided, exit the script
+if (process.argv.length < 3) {
+    console.error('Usage: ts-node ffmpegExtractor.ts <input-video-path>');
+    process.exit(1);
+}
+
+// Ensure the output directory exists (./storage/audio - always start command from project root)
+const outputDir = path.join(process.cwd(), 'storage', 'audio');
+if (!fs.existsSync(outputDir)) {
+    fs.mkdirSync(outputDir, { recursive: true });
+}
+
+// Get input video path from command line arguments
+const inputVideoPath = process.argv[2];
+// Derive output audio path from input video path
+const inputVideoName = path.basename(inputVideoPath, path.extname(inputVideoPath));
+// Define output audio path
+const outputAudioPath = path.join(outputDir, `${inputVideoName}.wav`);
+
+// Initialize progress bar
+const progressBar = new cliProgress.SingleBar({
+    format: 'Processing |{bar}| {percentage}% | {timemark}',
+    barCompleteChar: '\u2588',
+    barIncompleteChar: '\u2591',
+    hideCursor: true
+});
+
+// Function to extract audio from video. Possible parameters are videoFilePath and outputAudioPath. Ouptput format is wav.
+function extractAudioFromVideo(videoFilePath: string, outputAudioPath: string): Promise<void> {
+    return new Promise((resolve, reject) => {
+        ffmpeg(videoFilePath)
+            .outputFormat('wav') // Set the output format
+            .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) => {
+                console.error(`failed_audio_extraction: ${err.message}`);
+                reject(err);
+            })
+            .save(outputAudioPath); // Specify the output file path
+    });
+}
+
+// Call the function to extract audio. 
+extractAudioFromVideo(inputVideoPath, outputAudioPath)
+    .then(() => console.log('Audio extraction successful.'))
+    .catch((err) => console.error(err));