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utils/postVideoProcessing.js

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+const fs = require("fs-extra");
+const path = require("path");
+const { exec } = require("child_process");
+const util = require("util");
+const PostModel = require("../models/PostModel");
+
+const execPromise = util.promisify(exec);
+
+async function runFfmpeg(command) {
+  try {
+    await execPromise(command);
+    return true;
+  } catch (error) {
+    console.error("[postVideoProcessing]", error.message);
+    return false;
+  }
+}
+
+/** faststart بدون re-encode — شروع پخش سریع‌تر */
+async function optimizeVideoFaststart(filePath) {
+  if (!(await fs.pathExists(filePath))) return;
+
+  const dir = path.dirname(filePath);
+  const base = path.basename(filePath);
+  const tempPath = path.join(dir, `faststart-${Date.now()}-${base}`);
+
+  const ok = await runFfmpeg(
+    `ffmpeg -i "${filePath}" -c copy -movflags +faststart "${tempPath}" -y`
+  );
+
+  if (!ok || !(await fs.pathExists(tempPath))) return;
+
+  try {
+    await fs.rename(tempPath, filePath);
+    console.log(`[postVideoProcessing] faststart applied: ${base}`);
+  } catch (error) {
+    await fs.remove(tempPath).catch(() => {});
+    console.error("[postVideoProcessing] faststart rename failed:", error.message);
+  }
+}
+
+/** thumbnail برای poster در گرید و ریلز */
+async function generateVideoThumbnail(filePath, postId) {
+  if (!(await fs.pathExists(filePath))) return null;
+
+  const thumbDir = path.join(path.dirname(filePath), "..", "thumbnails");
+  await fs.ensureDir(thumbDir);
+
+  const thumbName = `${postId}.jpg`;
+  const thumbPath = path.join(thumbDir, thumbName);
+
+  const ok = await runFfmpeg(
+    `ffmpeg -ss 00:00:00.5 -i "${filePath}" -vframes 1 -q:v 3 -y "${thumbPath}"`
+  );
+
+  if (!ok || !(await fs.pathExists(thumbPath))) return null;
+
+  // مسیر نسبی قابل سرو از /storage/posts/thumbnails
+  return `/posts/thumbnails/${thumbName}`;
+}
+
+async function processPostVideoInBackground(filePath, postId) {
+  if (!filePath || !postId) return;
+
+  const existing = await PostModel.findById(postId).select('files post_images').lean();
+  const hasCustomCover =
+    existing?.files?.some((file) => file.type === 'image') ||
+    (existing?.post_images?.length ?? 0) > 0;
+  if (hasCustomCover) {
+    console.log(`[postVideoProcessing] skip thumbnail (custom cover) post=${postId}`);
+    await optimizeVideoFaststart(filePath);
+    return;
+  }
+
+  console.log(`[postVideoProcessing] start post=${postId}`);
+
+  await optimizeVideoFaststart(filePath);
+
+  const relativeThumb = await generateVideoThumbnail(filePath, postId);
+  if (!relativeThumb) return;
+
+  try {
+    await PostModel.findByIdAndUpdate(postId, {
+      $set: {
+        post_images: [relativeThumb],
+      },
+    });
+    console.log(`[postVideoProcessing] thumbnail saved post=${postId} path=${relativeThumb}`);
+  } catch (error) {
+    console.error("[postVideoProcessing] db update failed:", error.message);
+  }
+}
+
+module.exports = {
+  processPostVideoInBackground,
+  optimizeVideoFaststart,
+  generateVideoThumbnail,
+};