Method convertToSticker

gif/gif.ts:203–252

(msg: Api.Message, sourceMsg: Api.Message)

    return false;
  }

  private async convertToSticker(msg: Api.Message, sourceMsg: Api.Message) {
    const statusMsg = await msg.edit({ text: "🔄 正在分析媒体文件..." });

    // 检查文件大小
    const fileSize = this.getFileSize(sourceMsg);
    if (fileSize > this.config.maxFileSize * 1024 * 1024) {
      throw new Error(`文件过大 (${Math.round(fileSize / 1024 / 1024)}MB)，最大支持 ${this.config.maxFileSize}MB`);
    }

    // 检查视频时长（如果是视频）
    if (sourceMsg.video) {
      const duration = this.getVideoDuration(sourceMsg);
      if (duration > this.config.maxDuration) {
        throw new Error(`视频过长 (${duration}秒)，最大支持 ${this.config.maxDuration}秒`);
      }
    }

    await statusMsg?.edit({ text: "📥 正在下载文件..." });

    // 下载源文件
    const timestamp = Date.now();
    const inputFile = path.join(this.tempDir, `input_${timestamp}`);
    const outputFile = path.join(this.tempDir, `sticker_${timestamp}.webm`);

    try {
      await this.client.downloadMedia(sourceMsg.media!, { outputFile: inputFile });

      await statusMsg?.edit({ text: "🎬 正在转换为贴纸格式..." });

      // 使用 FFmpeg 转换为贴纸格式
      await this.convertWithFFmpeg(inputFile, outputFile);

      await statusMsg?.edit({ text: "📤 正在发送贴纸..." });
      await this.sendAsSticker(msg, outputFile);
      await statusMsg?.edit({ text: "✅ 贴纸转换完成！" });
      
      // 延迟删除状态消息 (generation-safe)
      const gen1 = getCurrentGeneration();
      const t1 = setTimeout(() => {
        pendingTimers.delete(t1);
        if (getCurrentGeneration() !== gen1) return;
        statusMsg?.delete().catch(() => {});
      }, 2000);
      pendingTimers.add(t1);

    } finally {
      // 清理临时文件
      this.cleanupFiles([inputFile, outputFile]);
    }
  }

  private getFileSize(msg: Api.Message): number {