Function convertEntities

yvlu/yvlu.ts:365–428

(entities: Api.TypeMessageEntity[])

    return {
      ok: false,
      message: "缺少 ffmpeg，请安装: apt-get install -y ffmpeg",
    };
  }
  return { ok: true, message: "" };
}

// TGS 转 WebM (使用 rlottie-python + ffmpeg)
async function convertTgsToWebm(tgsBuffer: Buffer): Promise<Buffer> {
  const os = await import("os");
  const tmpDir = os.tmpdir();
  const uniqueId =
    Date.now().toString() + "_" + Math.random().toString(36).slice(2);
  const tgsPath = path.join(tmpDir, `sticker_${uniqueId}.tgs`);
  const gifPath = path.join(tmpDir, `sticker_${uniqueId}.gif`);
  const webmPath = path.join(tmpDir, `sticker_${uniqueId}.webm`);

  try {
    fs.writeFileSync(tgsPath, tgsBuffer);

    const pythonScript = `
import sys

from rlottie_python import LottieAnimation
anim = LottieAnimation.from_tgs(sys.argv[1])
anim.save_animation(sys.argv[2])
`;

    await execFileAsync(PYTHON_PATH, ["-c", pythonScript, tgsPath, gifPath]);

    await execFileAsync("ffmpeg", [
      "-i",
      gifPath,
      "-c:v",
      "libvpx-vp9",
      "-pix_fmt",
      "yuva420p",
      "-b:v",
      "400k",
      "-auto-alt-ref",
      "0",
      "-an",
      "-y",
      webmPath,
    ]);

    const webmBuffer = fs.readFileSync(webmPath);
    return webmBuffer;
  } finally {
    try {
      fs.unlinkSync(tgsPath);
    } catch (e) {}
    try {
      fs.unlinkSync(gifPath);
    } catch (e) {}
    try {
      fs.unlinkSync(webmPath);
    } catch (e) {}
  }