Enhance file conversion endpoint with error handling and progress logging

index.js

@@ -1,24 +1,60 @@
 const express = require("express");
 const multer = require("multer");
-const { exec } = require("child_process");
-const path = require("path");
+const { spawn } = require("child_process");
 const fs = require("fs");
 
 const app = express();
 const upload = multer({ dest: "uploads/" });
 
 app.post("/convert", upload.fields([{ name: "audio" }, { name: "image" }]), (req, res) => {
+  if (!req.files || !req.files.audio || !req.files.image) {
+    console.error("❌ Missing file(s) in request");
+    return res.status(400).send("Missing audio or image file.");
+  }
+
   const audioPath = req.files.audio[0].path;
   const imagePath = req.files.image[0].path;
   const output = `output-${Date.now()}.mp4`;
 
-  const cmd = `ffmpeg -loop 1 -i ${imagePath} -i ${audioPath} -c:v libx264 -preset fast -tune stillimage -crf 18 -c:a aac -shortest -pix_fmt yuv420p ${output}`;
+  const args = [
+    "-loop", "1",
+    "-i", imagePath,
+    "-i", audioPath,
+    "-c:v", "libx264",
+    "-preset", "fast",
+    "-tune", "stillimage",
+    "-crf", "18",
+    "-c:a", "aac",
+    "-shortest",
+    "-pix_fmt", "yuv420p",
+    output
+  ];
+
+  console.log(`🚀 Starting FFmpeg conversion: ${output}`);
+  const ffmpeg = spawn("ffmpeg", args);
+
+  let lastLog = Date.now();
+
+  ffmpeg.stderr.on("data", (data) => {
+    const now = Date.now();
+    const text = data.toString();
+
+    // Log a progress update every 3 seconds max
+    if (text.includes("frame=") && now - lastLog > 3000) {
+      console.log(`[FFmpeg Progress] ${text.trim()}`);
+      lastLog = now;
+    }
+
+    // If you want verbose output uncomment this:
+    // console.log(`[FFmpeg Raw] ${text.trim()}`);
+  });
 
-  exec(cmd, (err) => {
-    if (err) {
-      console.error(err);
+  ffmpeg.on("exit", (code) => {
+    if (code !== 0) {
+      console.error(`❌ FFmpeg failed with code ${code}`);
       res.status(500).send("Conversion failed");
     } else {
+      console.log("✅ FFmpeg finished successfully. Sending file...");
       res.download(output, () => {
         fs.unlinkSync(audioPath);
         fs.unlinkSync(imagePath);
@@ -28,4 +64,8 @@ app.post("/convert", upload.fields([{ name: "audio" }, { name: "image" }]), (req
   });
 });
 
-app.listen(3000, () => console.log("FFmpeg API running on port 3000"));
+app.get("/", (req, res) => {
+  res.send("🎧 FileConvert API is up.");
+});
+
+app.listen(3000, () => console.log("✅ FileConvert API running on http://0.0.0.0:3000"));