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scripts/optimize-hero-banner.mjs

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+/**
+ * 将 public/banner.mp4（或 banner.source.mp4）压成首屏 Hero 尺寸。
+ * 用法：pnpm run optimize:banner
+ * 可选：把未压缩母带重命名为 banner.source.mp4，脚本会优先读取它并写回 banner.mp4。
+ */
+import { execFileSync } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import ffmpegPath from "ffmpeg-static";
+
+const root = path.join(path.dirname(fileURLToPath(import.meta.url)), "..");
+const publicDir = path.join(root, "public");
+const sourceCandidates = [
+  path.join(publicDir, "banner.source.mp4"),
+  path.join(publicDir, "banner.mp4"),
+];
+const input = sourceCandidates.find((p) => fs.existsSync(p));
+
+if (!input || !ffmpegPath) {
+  console.error("缺少 banner.mp4 / banner.source.mp4 或 ffmpeg 二进制。");
+  process.exit(1);
+}
+
+const outMp4 = path.join(publicDir, "banner.mp4");
+const outWebm = path.join(publicDir, "banner.webm");
+const tmpMp4 = path.join(publicDir, "banner.opt.mp4");
+
+const scale = "scale=1920:-2";
+const common = ["-y", "-i", input, "-an", "-vf", scale, "-pix_fmt", "yuv420p"];
+
+console.log(`输入: ${input}`);
+
+execFileSync(
+  ffmpegPath,
+  [
+    ...common,
+    "-c:v",
+    "libx264",
+    "-preset",
+    "slow",
+    "-crf",
+    "28",
+    "-movflags",
+    "+faststart",
+    tmpMp4,
+  ],
+  { stdio: "inherit" },
+);
+
+execFileSync(
+  ffmpegPath,
+  [
+    ...common,
+    "-c:v",
+    "libvpx-vp9",
+    "-crf",
+    "35",
+    "-b:v",
+    "0",
+    "-row-mt",
+    "1",
+    outWebm,
+  ],
+  { stdio: "inherit" },
+);
+
+fs.copyFileSync(tmpMp4, outMp4);
+fs.unlinkSync(tmpMp4);
+
+for (const f of [outMp4, outWebm]) {
+  const kb = (fs.statSync(f).size / 1024).toFixed(1);
+  console.log(`${path.basename(f)}: ${kb} KiB`);
+}