Version One

src/lib/video.ts

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+import { mkdtemp, writeFile, readFile, readdir } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { promisify } from 'node:util';
+import { execFile as _execFile } from 'node:child_process';
+
+const execFile = promisify(_execFile);
+
+export async function extractThumbnailsFromVideoBytes(
+  videoBytes: Uint8Array,
+  maxFrames: number | null = 8,
+  fps = 2,
+): Promise<Uint8Array[]> {
+  const tmpBase = await mkdtemp(join(tmpdir(), 'recipe-ai-'));
+  const inputPath = join(tmpBase, 'input.mp4');
+  await writeFile(inputPath, videoBytes);
+
+  const pattern = join(tmpBase, 'frame-%02d.jpg');
+  try {
+    // Extract frames at specified fps; if maxFrames <= 0 or null, extract full video
+    const args = [
+      '-hide_banner',
+      '-loglevel', 'error',
+      '-y',
+      '-i', inputPath,
+      '-vf', `fps=${fps}`,
+      '-q:v', '2',
+    ];
+    if (maxFrames && maxFrames > 0) {
+      args.push('-vframes', String(maxFrames));
+    }
+    args.push(pattern);
+    await execFile('ffmpeg', args, { timeout: 120_000 });
+  } catch {
+    return [];
+  }
+
+  try {
+    const files = (await readdir(tmpBase))
+      .filter((f) => /^frame-\d+\.jpg$/i.test(f))
+      .sort();
+    const results: Uint8Array[] = [];
+    for (const f of files) {
+      const buf = await readFile(join(tmpBase, f));
+      results.push(new Uint8Array(buf));
+    }
+    return results;
+  } catch {
+    return [];
+  }
+}
+
+