diff --git a/Dockerfile b/Dockerfile
index 65b7853..e7f41dd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,13 @@
-# 基础镜像 Python 3.12（3.9 已于 2025-10 EOL）；alpine + ffmpeg 组合保持不变
+# 基础镜像 Python 3.12（3.9 已于 2025-10 EOL）
 FROM python:3.12-alpine3.21
 WORKDIR /app
-# 使用阿里云 apk 镜像源加速安装 ffmpeg
-# 补 tzdata——alpine 无 zoneinfo，ENV TZ=Asia/Shanghai 不装它不生效
+# 使用阿里云 apk 镜像源加速安装
+# tzdata：alpine 无 zoneinfo，ENV TZ=Asia/Shanghai 不装它不生效
 # （容器内日志/展示本地时间差 8 小时；计费/会话全部 epoch 秒不受影响）
+# aria2：下载加速通道（常驻 RPC，仅监听 127.0.0.1 的随机端口 + 随机 secret）
+#   ——标签写入已改为 mutagen 纯 Python 实现，镜像不再需要 ffmpeg
 RUN sed -i 's|dl-cdn.alpinelinux.org|mirrors.aliyun.com|g' /etc/apk/repositories && \
-    apk add --no-cache tzdata ffmpeg
+    apk add --no-cache tzdata aria2
 # 依赖由 uv 从 uv.lock 精确安装（可复现构建）；uv 二进制仅存在于构建阶段
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 ENV UV_PROJECT_ENVIRONMENT=/usr/local UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
diff --git a/music_downloader/__init__.py b/music_downloader/__init__.py
index 76d68f5..ca3d96c 100644
--- a/music_downloader/__init__.py
+++ b/music_downloader/__init__.py
@@ -1,16 +1,16 @@
 # -*- coding: utf-8 -*-
-"""网易云音乐下载器（适配 ffmpeg 写入元数据）
+"""网易云音乐下载器（标签写入基于 mutagen，纯 Python）
 
 提供功能：
 - 同步 / 异步下载（本地落盘 / 内存返回）
 - 批量并发下载
 - 进度查询
-- 基于 ffmpeg 的元数据 + 封面写入（MP3/FLAC/M4A/MP4/OGG/Opus）
+- 基于 mutagen 的标签 + 封面写入（MP3/FLAC/M4A/MP4/OGG/Opus）
 
 设计要点：
-1. ffmpeg 路径懒加载：每次写入前重新检测，支持服务启动后中途安装
-2. 显式 -f 指定输出格式 + 临时文件保留原扩展名在最后，双保险
-3. MP4（杜比全景声 EAC3）单独分支，启用 +faststart
+1. 内容嗅探交给 filetype（按魔数识别容器），不再自维护魔数表
+2. 传输通道二选一：aria2c 常驻 RPC（多连接）优先，不可用时回落内置 aiohttp 流式
+3. 标签写入按容器分派（ID3v2.3 / Vorbis comment / iTunes ilst），全部原子替换
 4. 扩展名优先使用 API 返回的 type 字段，URL/Content-Type 兜底
 """
 
@@ -27,7 +27,6 @@ from ._concurrency import (
     get_file_lock,
 )
 from ._http import (
-    _AUDIO_MAGIC,
     _SESSION_LOCAL,
     DEFAULT_UA,
     DL_CHUNK_SIZE,
@@ -49,7 +48,6 @@ from .downloader import (
 )
 from .models import (
     API_TYPE_TO_EXT,
-    EXT_TO_FFMPEG_FORMAT,
     METADATA_FORMATS,
     DownloadCanceled,
     DownloadException,
@@ -63,9 +61,7 @@ __all__ = [
     'API_TYPE_TO_EXT',
     'DEFAULT_UA',
     'DL_CHUNK_SIZE',
-    'EXT_TO_FFMPEG_FORMAT',
     'METADATA_FORMATS',
-    '_AUDIO_MAGIC',
     '_COVER_CACHE',
     '_COVER_CACHE_LOCK',
     '_COVER_CACHE_MAX',
diff --git a/music_downloader/__main__.py b/music_downloader/__main__.py
index 57782d5..b56668f 100644
--- a/music_downloader/__main__.py
+++ b/music_downloader/__main__.py
@@ -21,9 +21,8 @@ if __name__ == "__main__":
     # 无参数：打印模块信息
     if len(sys.argv) < 2:
         print("网易云音乐下载器")
-        print(f"ffmpeg 路径: {downloader.ffmpeg_path or '未找到'}")
         print("支持的音质: standard / exhigh / lossless / hires / sky / jyeffect / jymaster / dolby")
-        print("支持的功能: 同步/批量下载、ffmpeg 元数据写入")
+        print("支持的功能: 同步/批量下载、标签与封面写入（mutagen 纯 Python）")
         print()
         print("用法:")
         print("  python music_downloader.py <music_id> [quality]            # 仅打印信息")
diff --git a/music_downloader/_aria2.py b/music_downloader/_aria2.py
new file mode 100644
index 0000000..dbb8959
--- /dev/null
+++ b/music_downloader/_aria2.py
@@ -0,0 +1,276 @@
+# -*- coding: utf-8 -*-
+"""aria2c 常驻 RPC 下载后端（可选加速通道；不可用时调用方降级）。
+
+为什么用常驻 RPC 而不是每个任务起一个 aria2c 进程：
+- 批量任务最多 500 首，逐首歌都付一次进程启动 + RPC 握手开销不划算；
+- 取消/查询只需一次 RPC，不必在进程表里追踪 N 个子进程。
+
+安全与稳健：
+- RPC 只监听 127.0.0.1 并强制随机 secret —— 无鉴权的 aria2 RPC 允许本机任意
+  进程操纵下载队列（读写任意文件），暴露到容器外等于开了一个后门；
+- aria2c 缺失 / 进程早退 / RPC 未就绪，一律返回 None 静默降级，
+  由调用方回落到既有的 core.sync_http 流式通道；
+- aria2 没有「单文件体积上限」选项，故用轮询 tellStatus 实现体积守卫与取消响应。
+"""
+
+from __future__ import annotations
+
+import atexit
+import secrets
+import shutil
+import socket
+import subprocess
+import threading
+import time
+from collections.abc import Callable
+from pathlib import Path
+from typing import Any, Protocol
+
+from core import sync_http as requests  # 同步门面（底层 aiohttp）
+
+from ._http import DEFAULT_UA
+from ._log import logger
+from .models import DownloadCanceled, DownloadException
+
+
+class _ProcessHandle(Protocol):
+    """aria2c 子进程的最小接口。
+
+    只依赖本模块真正调用的方法，既避免绑死 subprocess.Popen 具体类型，
+    也让测试可以用轻量替身驱动生命周期逻辑。
+    """
+
+    def poll(self) -> int | None: ...
+    def terminate(self) -> None: ...
+    def kill(self) -> None: ...
+    def wait(self, timeout: float | None = None) -> int: ...
+
+# aria2 可执行文件名。Docker 镜像内由 apk 提供；宿主未装则整条通道降级
+ARIA2_BIN = 'aria2c'
+
+# RPC 就绪等待上限：超过即判定启动失败并降级（不拖慢首次下载）
+_RPC_READY_TIMEOUT = 8.0
+# 状态轮询间隔：取消与体积守卫的响应粒度（0.3s 足够，RPC 开销可忽略）
+_POLL_INTERVAL = 0.3
+# 单文件体积守卫默认值，与 downloader 内置通道口径一致
+_DEFAULT_MAX_BYTES = 500 * 1024 * 1024
+# 分片数与单服务器连接数：网易云直链支持 Range，多连接可提速；
+# 数值保守（aria2 默认即 5），过高易触发 CDN 风控
+_SPLIT = 5
+_MIN_SPLIT_SIZE = '1M'
+
+_lock = threading.Lock()
+_backend: Aria2Backend | None = None
+_unavailable = False   # 启动失败后置位，不再反复重试
+
+
+def _free_port() -> int:
+    """向内核要一个空闲端口（bind 后立即释放，交给 aria2c 监听）。"""
+    with socket.socket() as s:
+        s.bind(('127.0.0.1', 0))
+        return int(s.getsockname()[1])
+
+
+class Aria2Backend:
+    """aria2c RPC 后端。请通过 get_backend() 获取单例，不要直接构造。"""
+
+    def __init__(self, api: Any, proc: _ProcessHandle, port: int) -> None:
+        self._api = api
+        self._proc = proc
+        self.port = port
+        self._closed = False
+
+    # ---------- 生命周期 ----------
+
+    def close(self) -> None:
+        """关闭 RPC 客户端并终止 aria2c 进程（幂等）。"""
+        if self._closed:
+            return
+        self._closed = True
+        try:
+            self._api.client.close()
+        except Exception:
+            pass   # 客户端关闭失败不影响后续进程回收
+        if self._proc.poll() is None:
+            self._proc.terminate()
+            try:
+                self._proc.wait(timeout=5)
+            except subprocess.TimeoutExpired:
+                self._proc.kill()
+                self._proc.wait(timeout=5)
+
+    # ---------- 下载 ----------
+
+    def fetch(
+        self,
+        url: str,
+        target: Path,
+        *,
+        ua: str = DEFAULT_UA,
+        referer: str | None = None,
+        cancel_event: threading.Event | None = None,
+        progress_cb: Callable[[int, int], None] | None = None,
+        max_bytes: int = _DEFAULT_MAX_BYTES,
+        timeout: float = 600.0,
+    ) -> None:
+        """把 url 下载到 target（落地即最终字节，含断点续传）。
+
+        Raises:
+            DownloadCanceled: cancel_event 置位（残片一并删除）
+            DownloadException: 体积超限（残片一并删除）、aria2 报告任务失败、总超时
+            requests.RequestException: RPC 抖动等可重试的网络类失败（保留残片续传）
+        """
+        options = {
+            'dir': str(target.parent),
+            'out': target.name,
+            'continue': 'true',             # 断点续传（控制文件 target.aria2 与残片同放）
+            'auto-file-renaming': 'false',  # 禁止另存为 target.1，否则与 .part 语义冲突
+            'allow-overwrite': 'true',
+            'split': str(_SPLIT),
+            'max-connection-per-server': str(_SPLIT),
+            'min-split-size': _MIN_SPLIT_SIZE,
+            'user-agent': ua,
+            'summary-interval': '0',
+            'quiet': 'true',
+        }
+        if referer:
+            options['referer'] = referer
+
+        try:
+            download = self._api.add_uris([url], options=options)
+        except Exception as e:
+            raise requests.RequestException(f'aria2 提交任务失败: {e}') from e
+
+        deadline = time.monotonic() + timeout
+        while True:
+            if cancel_event is not None and cancel_event.is_set():
+                self._abort(download, drop_files=True)
+                raise DownloadCanceled('下载已取消')
+            try:
+                download.update()
+            except Exception as e:
+                # RPC 抖动按可重试的网络失败上报，交给外层退避重试
+                raise requests.RequestException(f'aria2 状态查询失败: {e}') from e
+
+            done = int(download.completed_length or 0)
+            total = int(download.total_length or 0)
+            if progress_cb is not None:
+                try:
+                    progress_cb(done, total)
+                except Exception:
+                    pass   # 进度回调绝不影响下载主流程
+            if done > max_bytes:
+                self._abort(download, drop_files=True)
+                raise DownloadException(
+                    f'文件超过大小上限 {max_bytes // (1024 * 1024)}MB，已中止')
+            if download.is_complete:
+                self._drop_control_file(target)
+                return
+            if download.has_failed:
+                # 保留残片与控制文件，等待外层重试时续传
+                raise requests.RequestException(
+                    f'aria2 下载失败: {download.error_message or download.status}')
+            if time.monotonic() > deadline:
+                self._abort(download, drop_files=False)
+                raise requests.RequestException('aria2 下载超时')
+            time.sleep(_POLL_INTERVAL)
+
+    # ---------- 内部 ----------
+
+    def _abort(self, download: Any, *, drop_files: bool) -> None:
+        """强制移除任务。drop_files=True 时连同已下载字节一起删除。"""
+        try:
+            self._api.remove([download], force=True, files=drop_files)
+        except Exception as e:
+            logger.warning(f'终止 aria2 任务失败（不影响主流程）: {e}')
+
+    @staticmethod
+    def _drop_control_file(target: Path) -> None:
+        """清理 aria2 控制文件（正常情况下 aria2 已自行删除，这里兜底）。"""
+        ctrl = target.with_name(target.name + '.aria2')
+        try:
+            ctrl.unlink(missing_ok=True)
+        except OSError:
+            pass
+
+
+def get_backend() -> Aria2Backend | None:
+    """返回 aria2 后端单例；aria2c 不可用/启动失败时返回 None（调用方降级）。
+
+    首次调用尝试拉起常驻进程，之后命中缓存；失败结果进程内记忆，不反复重试。
+    """
+    global _backend, _unavailable
+    if _unavailable:
+        return None
+    if _backend is not None:
+        return _backend
+    with _lock:
+        if _unavailable:
+            return None
+        if _backend is None:
+            _backend = _try_start()
+            if _backend is None:
+                _unavailable = True
+    return _backend
+
+
+def _try_start() -> Aria2Backend | None:
+    """拉起 aria2c --enable-rpc 并等待 RPC 就绪；任何失败都返回 None。"""
+    exe = shutil.which(ARIA2_BIN)
+    if not exe:
+        logger.info('未检测到 aria2c，下载走内置流式通道')
+        return None
+    try:
+        import aria2p
+    except ImportError as e:
+        logger.info(f'aria2p 不可用，下载走内置流式通道: {e}')
+        return None
+
+    port = _free_port()
+    secret = secrets.token_urlsafe(24)
+    cmd = [
+        exe,
+        '--enable-rpc',
+        f'--rpc-listen-port={port}',
+        f'--rpc-secret={secret}',
+        '--rpc-listen-all=false',
+        '--rpc-allow-origin-all=false',
+        '--no-conf',
+        '--quiet=true',
+    ]
+    try:
+        # exe 来自 shutil.which，参数全部由本模块构造，不经任何用户输入
+        proc = subprocess.Popen(
+            cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    except OSError as e:
+        logger.warning(f'aria2c 启动失败，降级内置下载: {e}')
+        return None
+
+    client = aria2p.Client(host='http://127.0.0.1', port=port, secret=secret)
+    deadline = time.monotonic() + _RPC_READY_TIMEOUT
+    while True:
+        if proc.poll() is not None:
+            logger.warning(f'aria2c 进程提前退出（code={proc.returncode}），降级内置下载')
+            return None
+        try:
+            client.get_version()
+            break
+        except Exception:
+            if time.monotonic() > deadline:
+                logger.warning(f'aria2c RPC {_RPC_READY_TIMEOUT:.0f}s 内未就绪，降级内置下载')
+                proc.kill()
+                proc.wait(timeout=5)
+                return None
+            time.sleep(0.2)
+
+    atexit.register(_shutdown)
+    logger.info(f'aria2c 常驻 RPC 已就绪（127.0.0.1:{port}，{_SPLIT} 连接/文件）')
+    return Aria2Backend(aria2p.API(client), proc, port)
+
+
+def _shutdown() -> None:
+    """进程退出时回收 aria2c（atexit 只注册一次）。"""
+    global _backend
+    if _backend is not None:
+        _backend.close()
+        _backend = None
diff --git a/music_downloader/_http.py b/music_downloader/_http.py
index 681fb23..20d95e1 100644
--- a/music_downloader/_http.py
+++ b/music_downloader/_http.py
@@ -8,6 +8,8 @@ from __future__ import annotations
 
 import threading
 
+import filetype
+
 from core import sync_http as requests  # 同步门面（底层 aiohttp，替代 requests）
 
 # ============ HTTP 连接复用（提速核心） ============
@@ -27,26 +29,28 @@ DL_CHUNK_SIZE = 256 * 1024
 _SESSION_LOCAL = threading.local()
 
 
-# 下载内容嗅探的音频魔数（未知期望尺寸时唯一的内容防线）
-_AUDIO_MAGIC = (b'ID3', b'fLaC', b'OggS', b'RIFF')
+# M4A/MP4 音频在 filetype 里被判为 video/mp4——mp4 是复合容器，仅凭魔数无法
+# 区分音频轨与视频轨，故显式放行该 mime。
+_CONTAINER_MIMES = frozenset({'video/mp4'})
 
 
 def _sniff_audio_header(path) -> bool:
-    """读取文件头做基础音频魔数校验：MP3(ID3/裸帧)、FLAC、OGG/Opus、WAV(RIFF)、
-    M4A/MP4(ftyp)。未知期望尺寸的下载走"非空即通过"保留口径，本函数补上内容
-    防线——CDN 错误页/风控 JSON 不再能被存成音频交付。"""
+    """按魔数判定文件是否为音频容器（MP3/FLAC/OGG/Opus/WAV/M4A/MP4）。
+
+    未知期望尺寸的下载走"非空即通过"保留口径，本函数补上内容防线——
+    CDN 错误页/风控 JSON 不再能被存成音频交付。
+
+    识别交给 filetype（内置完整类型表，覆盖各格式的多种帧头变体），
+    不再自行维护魔数前缀与 ftyp 偏移；对空文件/未知格式返回 False。
+    """
     try:
-        with open(path, 'rb') as f:
-            head = f.read(16)
+        kind = filetype.guess(str(path))
     except OSError:
         return False
-    if not head:
+    if kind is None:
         return False
-    if any(head.startswith(m) for m in _AUDIO_MAGIC):
-        return True
-    if len(head) >= 8 and head[:4] == b'\x00\x00\x00' and head[4:8] == b'ftyp':
-        return True
-    return len(head) >= 2 and head[0] == 0xFF and (head[1] & 0xE0) == 0xE0
+    mime = (kind.mime or '').lower()
+    return mime.startswith('audio/') or mime in _CONTAINER_MIMES
 
 
 def get_http_session() -> requests.Session:
diff --git a/music_downloader/downloader.py b/music_downloader/downloader.py
index 22d1c40..674a671 100644
--- a/music_downloader/downloader.py
+++ b/music_downloader/downloader.py
@@ -8,9 +8,6 @@ from __future__ import annotations
 
 import os
 import re
-import shutil
-import subprocess
-import tempfile
 import threading
 import time
 from pathlib import Path
@@ -19,6 +16,7 @@ from core import sync_http as requests  # 同步门面（底层 aiohttp，替代
 from core.async_bridge import run_sync
 from music_api import APIException, NeteaseAPI, load_cookies
 
+from ._aria2 import Aria2Backend, get_backend
 from ._concurrency import (
     CountingSemaphore,
     get_file_lock,
@@ -36,14 +34,16 @@ from .cover import (
 )
 from .models import (
     API_TYPE_TO_EXT,
-    EXT_TO_FFMPEG_FORMAT,
-    METADATA_FORMATS,
     DownloadCanceled,
     DownloadException,
     DownloadResult,
     MusicInfo,
     _RetryFromScratch,
 )
+from .tagging import build_tags, write_tags
+
+# 单文件下载体积硬上限：超限即弃，防止单文件拖垮磁盘
+_MAX_DOWNLOAD_BYTES = 500 * 1024 * 1024
 
 # ============ 核心实现 ============
 
@@ -59,15 +59,13 @@ class MusicDownloader:
         self,
         download_dir: str = "downloads",
         max_concurrent: int = 3,
-        ffmpeg_path: str | None = None,
         global_max_concurrent: int = 10,
     ):
         """
         Args:
             download_dir: 下载目录
             max_concurrent: 单个批量任务内的最大并发下载数
-            ffmpeg_path: ffmpeg 可执行文件路径，为 None 时启动时检测一次
-            global_max_concurrent: 整个服务同时下载的文件数（含 ffmpeg 元数据写入）。
+            global_max_concurrent: 整个服务同时下载的文件数（含标签写入）。
                 所有请求共享该信号量，防止大量用户同时下载导致内存/CPU 耗尽。
         """
         self.download_dir = Path(download_dir)
@@ -80,15 +78,10 @@ class MusicDownloader:
         # （带计数，供前端实时展示排队情况）
         self._download_semaphore = CountingSemaphore(global_max_concurrent)
 
-        # ffmpeg 元数据写入专用信号量（CPU 密集操作）：
-        # 与下载分离限流 —— 元数据写满时只阻塞元数据，不占下载名额、不拖慢其它文件的传输
+        # 标签写入专用信号量：写标签会重写整个文件（IO 密集），
+        # 与下载分离限流 —— 写满时只阻塞后来者，不占下载名额、不拖慢其它文件的传输
         cpu_count = os.cpu_count() or 2
-        self._meta_semaphore = threading.BoundedSemaphore(max(1, min(4, cpu_count)))
-
-        # ffmpeg 路径缓存：启动时检测一次，写入时还会再懒加载一次
-        self.ffmpeg_path = ffmpeg_path or shutil.which("ffmpeg")
-        if not self.ffmpeg_path:
-            logger.warning("未检测到 ffmpeg，写入元数据功能将不可用")
+        self._tag_semaphore = threading.BoundedSemaphore(max(1, min(4, cpu_count)))
 
     # ----------- 工具方法 -----------
 
@@ -142,18 +135,6 @@ class MusicDownloader:
 
         return ".mp3"
 
-    def _resolve_ffmpeg(self) -> str | None:
-        """懒加载解析 ffmpeg 路径
-
-        每次写入前调用一次：若启动时未检测到，但中途已安装，下一次就能用。
-        """
-        if self.ffmpeg_path:
-            return self.ffmpeg_path
-        path = shutil.which("ffmpeg")
-        if path:
-            self.ffmpeg_path = path  # 回写缓存
-        return path
-
     @staticmethod
     def _unlink_quiet(path: Path) -> None:
         """安静地删除文件，忽略不存在 / 权限错误"""
@@ -328,6 +309,11 @@ class MusicDownloader:
                 self._unlink_quiet(part_path0)
                 raise DownloadCanceled("下载已取消")
 
+            # part_path 是 file_path 的 .part 别名。必须在进入下载 try 之前绑定：
+            # except 分支（取消/网络错误）要清理 .part，若此处未赋值，异常处理器
+            # 会以 NameError 二次崩溃、掩盖原始异常
+            part_path = part_path0
+
             # 同一目标文件的下载者串行化（不同文件之间仍然并行）
             with get_file_lock(file_path):
                 try:
@@ -345,8 +331,8 @@ class MusicDownloader:
                         else:
                             # 缓存命中也尊重本次的元数据请求（重跑一次 ffmpeg，幂等）
                             if write_meta:
-                                with self._meta_semaphore:
-                                    self._write_metadata_with_ffmpeg(file_path, music_info, meta_fields)
+                                with self._tag_semaphore:
+                                    self._write_metadata(file_path, music_info, meta_fields)
                             return DownloadResult(
                                 success=True,
                                 file_path=str(file_path),
@@ -354,7 +340,7 @@ class MusicDownloader:
                                 music_info=music_info,
                             )
 
-                    part_path = file_path.with_name(file_path.name + ".part")
+                    # part_path 已在文件锁外绑定为 part_path0（同一路径），此处不再重复计算
                     resume_from = 0
                     if part_path.exists():
                         existing = part_path.stat().st_size
@@ -364,8 +350,8 @@ class MusicDownloader:
                             # 改 >= 为 ==——超尺寸残片（上游多发货/坏分片）转正即交付坏文件
                             os.replace(part_path, file_path)
                             if write_meta:
-                                with self._meta_semaphore:
-                                    self._write_metadata_with_ffmpeg(file_path, music_info, meta_fields)
+                                with self._tag_semaphore:
+                                    self._write_metadata(file_path, music_info, meta_fields)
                             return DownloadResult(
                                 success=True,
                                 file_path=str(file_path),
@@ -387,85 +373,15 @@ class MusicDownloader:
                     if not self._download_semaphore.acquire_cancellable(cancel_event, poll=0.5):
                         raise DownloadCanceled("下载已取消")
                     try:
-                        headers = {}
-                        mode = "wb"
-                        if resume_from > 0:
-                            headers["Range"] = f"bytes={resume_from}-"
-                            mode = "ab"
-
-                        if progress_cb is not None:
-                            try:
-                                progress_cb(resume_from, music_info.file_size or 0)
-                            except Exception:
-                                pass   # 进度回调绝不影响下载主流程
-                        resp: requests.SyncResponse | None = None
-                        try:
-                            resp = get_http_session().get(
-                                music_info.download_url,
-                                stream=True,
-                                timeout=(10, 60),
-                                headers=headers,
-                            )
-                            # 服务器忽略 Range 返回 200 → 从头重写而非追加
-                            if resume_from > 0 and resp.status_code != 206:
-                                mode = "wb"
-                            # 206 必须从我们请求的起点开始；起点错位的分片拼起来是坏文件
-                            if resume_from > 0 and resp.status_code == 206:
-                                cr = resp.headers.get('Content-Range') or ''
-                                m = re.match(r'bytes\s+(\d+)-', cr.strip())
-                                if m and int(m.group(1)) != resume_from:
-                                    self._unlink_quiet(part_path)
-                                    raise _RetryFromScratch(
-                                        f"Content-Range 起点错位（{m.group(1)} != {resume_from}），已从头重新下载")
-                                # 206 却解析不出起点（头被中间层剥离）——盲追加可能拼坏文件，
-                                # 与起点错位同口径处理：清残片从头下
-                                if not m:
-                                    self._unlink_quiet(part_path)
-                                    raise _RetryFromScratch("206 响应缺少可用 Content-Range，已从头重新下载")
-                            resp.raise_for_status()
-                            # 下载体积硬上限（配置 500MB），超限即弃，防单文件拖垮磁盘
-                            max_bytes = 500 * 1024 * 1024
-                            written = resume_from if mode == 'ab' else 0
-                            over_limit = False
-                            with open(part_path, mode) as f:
-                                for chunk in resp.iter_content(chunk_size=DL_CHUNK_SIZE):
-                                    if cancel_event is not None and cancel_event.is_set():
-                                        raise DownloadCanceled("下载已取消")
-                                    if chunk:
-                                        f.write(chunk)
-                                        written += len(chunk)
-                                        if written > max_bytes:
-                                            # 超限残片没有任何续传价值。
-                                            # Windows 无法删除打开中的文件——置标志 break，
-                                            # with 关闭后再清理（原实现在打开中 unlink 被静默吞掉）
-                                            over_limit = True
-                                            break
-                                        if progress_cb is not None:
-                                            try:
-                                                progress_cb(written, music_info.file_size or 0)
-                                            except Exception:
-                                                pass   # 进度回调绝不影响下载主流程
-                            if over_limit:
-                                self._unlink_quiet(part_path)   # 文件已关闭，清理可达
-                                raise DownloadException(
-                                    f"文件超过大小上限 {max_bytes // (1024*1024)}MB，已中止")
-                        except requests.HTTPError as e:
-                            # Range 起点无效（如 CDN 环节变化）：清除旧 part，从头重新下载
-                            status = getattr(getattr(e, "response", None), "status_code", None)
-                            if status == 416:
-                                self._unlink_quiet(part_path)
-                                raise _RetryFromScratch("Range 起点失效，已从头重新下载") from e
-                            if status is not None and 400 <= status < 500 and status != 408:
-                                # CDN 4xx（403 防盗链/429 风控等）是确定性
-                                # 失败，对同一失效直链白重试只会加剧风控、拖慢失败返回
-                                # （408 请求超时保留可重试）
-                                self._unlink_quiet(part_path)
-                                raise DownloadException(
-                                    f"下载失败（HTTP {status}），下载链接可能已失效") from e
-                            raise
-                        finally:
-                            if resp is not None:
-                                resp.close()
+                        aria2_backend = get_backend()
+                        if aria2_backend is not None:
+                            # aria2c 通道：多连接 + 原生断点续传
+                            self._fetch_via_aria2(aria2_backend, music_info, part_path,
+                                                  cancel_event, progress_cb)
+                        else:
+                            # 内置通道：aiohttp 流式落盘 + Range 起点校验
+                            self._fetch_via_http(music_info, part_path, resume_from,
+                                                 cancel_event, progress_cb)
                     finally:
                         # 与 acquire_cancellable 配对释放（原 with 语义）
                         self._download_semaphore.release()
@@ -501,8 +417,8 @@ class MusicDownloader:
                         # 进入信号量排队/ffmpeg 等待（有界但可达 120s），收尾不再延迟
                         if cancel_event is not None and cancel_event.is_set():
                             raise DownloadCanceled("下载已取消")
-                        with self._meta_semaphore:
-                            self._write_metadata_with_ffmpeg(file_path, music_info, meta_fields)
+                        with self._tag_semaphore:
+                            self._write_metadata(file_path, music_info, meta_fields)
 
                     return DownloadResult(
                         success=True,
@@ -548,229 +464,151 @@ class MusicDownloader:
         return DownloadResult(success=False, error_message=last_error or "下载失败")
 
 
-    # ============ ffmpeg 元数据写入（核心） ============
+    # ----------- 传输通道（二选一，产物都是 part_path） -----------
+
+    def _fetch_via_http(
+        self,
+        music_info: MusicInfo,
+        part_path: Path,
+        resume_from: int,
+        cancel_event: threading.Event | None,
+        progress_cb,
+    ) -> None:
+        """内置流式通道：core.sync_http 逐块落盘，支持 Range 断点续传。
+
+        Raises:
+            DownloadCanceled: 取消事件置位
+            DownloadException: 体积超限、CDN 4xx 等确定性失败
+            _RetryFromScratch: 续传起点失效（残片已清，外层从头重下）
+        """
+        headers = {}
+        mode = "wb"
+        if resume_from > 0:
+            headers["Range"] = f"bytes={resume_from}-"
+            mode = "ab"
+
+        if progress_cb is not None:
+            try:
+                progress_cb(resume_from, music_info.file_size or 0)
+            except Exception:
+                pass   # 进度回调绝不影响下载主流程
+        resp: requests.SyncResponse | None = None
+        try:
+            resp = get_http_session().get(
+                music_info.download_url,
+                stream=True,
+                timeout=(10, 60),
+                headers=headers,
+            )
+            # 服务器忽略 Range 返回 200 → 从头重写而非追加
+            if resume_from > 0 and resp.status_code != 206:
+                mode = "wb"
+            # 206 必须从我们请求的起点开始；起点错位的分片拼起来是坏文件
+            if resume_from > 0 and resp.status_code == 206:
+                cr = resp.headers.get('Content-Range') or ''
+                m = re.match(r'bytes\s+(\d+)-', cr.strip())
+                if m and int(m.group(1)) != resume_from:
+                    self._unlink_quiet(part_path)
+                    raise _RetryFromScratch(
+                        f"Content-Range 起点错位（{m.group(1)} != {resume_from}），已从头重新下载")
+                # 206 却解析不出起点（头被中间层剥离）——盲追加可能拼坏文件，
+                # 与起点错位同口径处理：清残片从头下
+                if not m:
+                    self._unlink_quiet(part_path)
+                    raise _RetryFromScratch("206 响应缺少可用 Content-Range，已从头重新下载")
+            resp.raise_for_status()
+            # 下载体积硬上限（配置 500MB），超限即弃，防单文件拖垮磁盘
+            max_bytes = _MAX_DOWNLOAD_BYTES
+            written = resume_from if mode == 'ab' else 0
+            over_limit = False
+            with open(part_path, mode) as f:
+                for chunk in resp.iter_content(chunk_size=DL_CHUNK_SIZE):
+                    if cancel_event is not None and cancel_event.is_set():
+                        raise DownloadCanceled("下载已取消")
+                    if chunk:
+                        f.write(chunk)
+                        written += len(chunk)
+                        if written > max_bytes:
+                            # 超限残片没有任何续传价值。
+                            # Windows 无法删除打开中的文件——置标志 break，
+                            # with 关闭后再清理（原实现在打开中 unlink 被静默吞掉）
+                            over_limit = True
+                            break
+                        if progress_cb is not None:
+                            try:
+                                progress_cb(written, music_info.file_size or 0)
+                            except Exception:
+                                pass   # 进度回调绝不影响下载主流程
+            if over_limit:
+                self._unlink_quiet(part_path)   # 文件已关闭，清理可达
+                raise DownloadException(
+                    f"文件超过大小上限 {max_bytes // (1024*1024)}MB，已中止")
+        except requests.HTTPError as e:
+            # Range 起点无效（如 CDN 环节变化）：清除旧 part，从头重新下载
+            status = getattr(getattr(e, "response", None), "status_code", None)
+            if status == 416:
+                self._unlink_quiet(part_path)
+                raise _RetryFromScratch("Range 起点失效，已从头重新下载") from e
+            if status is not None and 400 <= status < 500 and status != 408:
+                # CDN 4xx（403 防盗链/429 风控等）是确定性
+                # 失败，对同一失效直链白重试只会加剧风控、拖慢失败返回
+                # （408 请求超时保留可重试）
+                self._unlink_quiet(part_path)
+                raise DownloadException(
+                    f"下载失败（HTTP {status}），下载链接可能已失效") from e
+            raise
+        finally:
+            if resp is not None:
+                resp.close()
+
+    def _fetch_via_aria2(
+        self,
+        backend: Aria2Backend,
+        music_info: MusicInfo,
+        part_path: Path,
+        cancel_event: threading.Event | None,
+        progress_cb,
+    ) -> None:
+        """aria2c 通道：多连接加速 + 原生断点续传。
+
+        异常语义与内置通道对齐：取消抛 DownloadCanceled、体积超限抛
+        DownloadException（均清残片），网络类失败抛 RequestException
+        （保留残片，由外层退避重试续传）。
+        """
+        backend.fetch(
+            music_info.download_url,
+            part_path,
+            cancel_event=cancel_event,
+            progress_cb=progress_cb,
+            max_bytes=_MAX_DOWNLOAD_BYTES,
+        )
+
+
+    # ============ 元数据写入（mutagen，纯 Python） ============
     # download_music_to_memory / download_batch_async / get_download_progress
     # 三个方法已删除——全服务端与验证脚本零调用（CLI 遗留），且 to_memory 不接受
     # cookies 参数、真被启用会有行为差异；如需内存下载/异步批量再按当前接口重写
 
-    def _write_metadata_with_ffmpeg(
+    def _write_metadata(
         self,
         file_path: Path,
         music_info: MusicInfo,
         fields: list[str] | None = None,
     ) -> bool:
-        """使用 ffmpeg 写入音频元数据
+        """写入音频标签与封面（mutagen）；失败不影响交付，返回是否成功。
 
-        处理: title/artist/album/track + 封面（如果是 mp3/flac/m4a/mp4）
-        fields: 可选字段列表 ['title','artist','album','cover','lyrics','date']；
-                None 表示全部写入。
+        Args:
+            file_path: 已转正的音频文件
+            music_info: 歌曲信息（标题/歌手/专辑/年份/曲号/歌词/封面地址）
+            fields: 要写入的字段列表，None 表示全部写入
 
-        Returns:
-            是否写入成功（失败不影响主流程）
+        封面走共享缓存（与 ZIP 打包共用一次网络请求）；各容器的落盘细节见
+        tagging.py——按扩展名分派到 ID3v2.3 / Vorbis comment / iTunes ilst。
         """
-        ffmpeg_path = self._resolve_ffmpeg()
-        if not ffmpeg_path:
-            logger.warning("跳过元数据写入: ffmpeg 不可用")
-            return False
-
-        file_ext = file_path.suffix.lower()
-        if file_ext not in METADATA_FORMATS:
-            logger.warning(f"跳过元数据写入: 不支持的格式 {file_ext}")
-            return False
-
-        if not file_path.exists():
-            logger.warning(f"跳过元数据写入: 文件不存在 {file_path}")
-            return False
-
-        # 临时输出文件：保留原扩展名在最后，便于 ffmpeg 识别 muxer
-        # 例: 艾辰 - 错位时空.tagging.flac
-        tmp_output = file_path.with_name(
-            file_path.stem + ".tagging" + file_path.suffix
-        )
-        # 临时封面文件
-        cover_tmp: str | None = None
-        cover_ok = False   # 创建成功与否与"路径是否需要清理"分离管理
-
-        try:
-            # 下载封面到临时文件（走共享缓存：与 ZIP 打包共用一次网络请求）
-            include_cover = fields is None or "cover" in fields
-            if include_cover and music_info.pic_url:
-                cover_data = fetch_cover_bytes(music_info.pic_url)
-                if cover_data:
-                    try:
-                        fd, cover_tmp = tempfile.mkstemp(suffix=".jpg", dir=str(self.download_dir))
-                        os.close(fd)
-                        with open(cover_tmp, "wb") as cf:
-                            cf.write(cover_data)
-                        cover_ok = True
-                    except Exception as e:
-                        # cover_tmp 保持指向已创建的文件，finally 统一清理
-                        # 原实现置 None 会把已创建的零字节文件遗留在下载目录）
-                        logger.warning(f"封面写盘失败，跳过封面写入: {e}")
-                else:
-                    logger.warning("封面下载失败，跳过封面写入")
-
-            # 构造 ffmpeg 命令
-            # 顺序: global opts -> -i input1 -> -i input2 -> metadata -> mapping -> -f format -> output
-            output_format = EXT_TO_FFMPEG_FORMAT.get(file_ext, "")
-            cmd: list[str] = [
-                ffmpeg_path, "-y", "-loglevel", "error",
-                "-i", str(file_path),
-            ]
-            use_cover = cover_ok
-            # OGG/Opus 的封面流 copy 不被支持（Unsupported codec id），
-            # 主动降级为"只写文本元数据"，不再让整个写入失败
-            if use_cover and file_ext in (".ogg", ".opus"):
-                use_cover = False
-                logger.info("OGG/Opus 不支持封面写入，仅写入文本元数据")
-            if use_cover and cover_tmp:
-                cmd += ["-i", cover_tmp]
-
-            # 通用元数据（仅写入勾选的字段）
-            meta = {}
-            # 前端字段名为 name，与后端 title 统一映射
-            if fields is None or "title" in fields or "name" in fields:
-                meta["title"] = music_info.name
-            if fields is None or "artist" in fields:
-                meta["artist"] = music_info.artists
-                meta["album_artist"] = music_info.artists
-            if fields is None or "album" in fields:
-                meta["album"] = music_info.album
-            if fields is None or "date" in fields:
-                if music_info.publish_year:
-                    meta["date"] = str(music_info.publish_year)
-                    meta["year"] = str(music_info.publish_year)
-            if fields is None or "lyrics" in fields:
-                if music_info.lyric and music_info.lyric.strip():
-                    # 去掉 LRC 时间标签，写入纯歌词
-                    clean_lyric = re.sub(
-                        r"\[\d{1,2}:\d{1,2}([.:]\d+)?\]", "", music_info.lyric
-                    ).strip()
-                    if clean_lyric:
-                        meta["lyrics"] = clean_lyric
-            if music_info.track_number > 0 and (fields is None or "track" in fields):
-                # 只写当前曲号；没有真实专辑总数时不虚构 tracktotal
-                meta["track"] = str(music_info.track_number)
-            for k, v in meta.items():
-                if v:
-                    cmd += ["-metadata", f"{k}={v}"]
-
-            # 各格式的 mapping / 编码选项
-            cmd += self._build_format_args(file_ext, has_cover=use_cover)
-
-            # -f 必须放在所有 -i 之后（作为 output option）才生效
-            if output_format:
-                cmd += ["-f", output_format]
-            cmd.append(str(tmp_output))
-
-            # 执行
-            result = subprocess.run(
-                cmd,
-                capture_output=True,
-                text=True,
-                timeout=120,
-                encoding="utf-8",
-                errors="ignore",
-            )
-
-            if result.returncode == 0 and tmp_output.exists():
-                # os.replace 才是同卷原子替换——shutil.move 在目标已
-                # 存在时退化为 copy2+unlink，进程中断会留半截文件
-                os.replace(str(tmp_output), str(file_path))
-                return True
-
-            # ffmpeg stderr 原文走 logger（errors='ignore' 解码后的任意 Unicode
-            # 在 GBK 重定向下裸 print 会崩 worker）
-            logger.warning(
-                f"ffmpeg 写入元数据失败: {(result.stderr or result.stdout or '').strip()}"
-            )
-            return False
-
-        except subprocess.TimeoutExpired:
-            logger.warning("ffmpeg 执行超时")
-            return False
-        except FileNotFoundError:
-            logger.warning(f"ffmpeg 可执行文件未找到: {ffmpeg_path}")
-            return False
-        except Exception as e:
-            logger.warning(f"ffmpeg 写入元数据异常: {e}")
-            return False
-        finally:
-            # 清理封面临时文件
-            if cover_tmp and os.path.exists(cover_tmp):
-                try:
-                    os.unlink(cover_tmp)
-                except OSError:
-                    pass
-            # 清理可能残留的临时输出
-            if tmp_output.exists():
-                try:
-                    tmp_output.unlink()
-                except OSError:
-                    pass
-
-    def _build_format_args(self, file_ext: str, has_cover: bool) -> list[str]:
-        """根据文件格式构造 mapping / 编码参数
-        不写封面时用 -map 0 -c copy 保留全部既有流（含已有封面），
-        原实现 -map 0:a 会把 MP3/M4A 已有封面静默删掉。"""
-        if file_ext == ".mp3":
-            # MP3: 封面通过 ID3v2 APIC 帧写入
-            if has_cover:
-                return [
-                    "-map", "0:a", "-map", "1:v",
-                    "-c:a", "copy", "-c:v", "copy",
-                    "-id3v2_version", "3",
-                    "-metadata:s:v", "title=Album cover",
-                    "-metadata:s:v", "comment=Cover (front)",
-                ]
-            return ["-map", "0", "-c", "copy", "-id3v2_version", "3"]
-
-        if file_ext == ".flac":
-            # FLAC: 原生支持封面
-            if has_cover:
-                return [
-                    "-map", "0", "-map", "1",
-                    "-c", "copy",
-                    "-disposition:v:0", "attached_pic",
-                ]
-            return ["-map", "0", "-c", "copy"]
-
-        if file_ext == ".m4a":
-            # M4A: AAC 音频 + mp4 容器
-            if has_cover:
-                return [
-                    "-map", "0:a", "-map", "1:v",
-                    "-c", "copy",
-                    "-disposition:v:0", "attached_pic",
-                    "-metadata:s:v", "title=Album cover",
-                    "-metadata:s:v", "comment=Cover (front)",
-                ]
-            # 保留既有封面流（原 -map 0:a 会删掉已有封面）
-            return ["-map", "0", "-c", "copy"]
-
-        if file_ext == ".mp4":
-            # MP4 (杜比全景声 EAC3 / 其它 mp4 容器音频)
-            # 杜比文件通常无视频流，封面作为 video stream 注入；+faststart 让 moov 在文件头
-            if has_cover:
-                return [
-                    "-map", "0", "-map", "1:v",
-                    "-c", "copy",
-                    "-disposition:v:0", "attached_pic",
-                    "-metadata:s:v", "title=Album cover",
-                    "-metadata:s:v", "comment=Cover (front)",
-                    "-movflags", "+faststart",
-                ]
-            return ["-map", "0", "-c", "copy", "-movflags", "+faststart"]
-
-        if file_ext in (".ogg", ".opus"):
-            if has_cover:
-                return [
-                    "-map", "0:a", "-map", "1:v",
-                    "-c:a", "copy", "-c:v", "copy",
-                ]
-            return ["-map", "0:a", "-c:a", "copy"]
-
-        # 默认
-        if has_cover:
-            return ["-map", "0:a", "-map", "1:v", "-c", "copy"]
-        return ["-map", "0:a", "-c:a", "copy"]
+        include_cover = fields is None or "cover" in fields
+        cover: bytes | None = None
+        if include_cover and music_info.pic_url:
+            cover = fetch_cover_bytes(music_info.pic_url)
+            if not cover:
+                logger.warning("封面下载失败，跳过封面写入")
+        return write_tags(file_path, build_tags(music_info, fields), cover)
diff --git a/music_downloader/models.py b/music_downloader/models.py
index a1ef6e8..ff22c6a 100644
--- a/music_downloader/models.py
+++ b/music_downloader/models.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-"""数据模型、异常与 ffmpeg 格式常量。
+"""数据模型、异常与格式常量。
 
 （自 music_downloader.py 拆出，行为与原实现一致。）
 """
@@ -82,16 +82,5 @@ API_TYPE_TO_EXT = {
 }
 
 
-# 文件扩展名 -> ffmpeg 输出 muxer 名称
-EXT_TO_FFMPEG_FORMAT = {
-    ".mp3": "mp3",
-    ".flac": "flac",
-    ".m4a": "mp4",
-    ".mp4": "mp4",
-    ".ogg": "ogg",
-    ".opus": "opus",
-}
-
-
-# 支持元数据写入的扩展名
+# 支持元数据写入的扩展名（tagging.py 按此表分派到各容器的标签写入器）
 METADATA_FORMATS = {".mp3", ".flac", ".m4a", ".mp4", ".ogg", ".opus"}
diff --git a/music_downloader/tagging.py b/music_downloader/tagging.py
new file mode 100644
index 0000000..c28ad58
--- /dev/null
+++ b/music_downloader/tagging.py
@@ -0,0 +1,240 @@
+# -*- coding: utf-8 -*-
+"""音频标签与封面写入（mutagen 纯 Python 实现，不需要 ffmpeg 命令）。
+
+为什么不再用 ffmpeg CLI：本工程的元数据写入只做「改标签」，不做任何重编码，
+而 ffmpeg 命令行必须出现**重复的** `-metadata` / `-map` 参数；ffmpeg-python 用
+`**kwargs` 字典建模这些选项，结构上无法表达重复键（实测把列表值字符串化成
+`"['0', '1:v']"`），绕一圈仍需手写命令拼接。改用 mutagen 后整段变成纯 Python
+调用，部署镜像也不必再装 ffmpeg。
+
+覆盖容器：
+- MP3        ID3v2.3（TIT2 / TPE1 / TPE2 / TALB / TDRC / TRCK / USLT / APIC）
+- FLAC       Vorbis comment（title / artist / albumartist / …）+ Picture 块
+- M4A / MP4  iTunes ilst（©nam / ©ART / aART / ©alb / ©day / trkn / ©lyr）+ covr
+- OGG / Opus Vorbis comment + METADATA_BLOCK_PICTURE（base64 编码的 Picture 块）
+
+写入一律走 mutagen 的原子替换（临时文件 + os.replace），中途失败不会留下半截文件；
+且是「就地改帧」，原有未触及的标签（TXXX 等）会被保留。
+"""
+
+from __future__ import annotations
+
+import base64
+import re
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any
+
+from ._log import logger
+from .models import METADATA_FORMATS, MusicInfo
+
+# 封面类型：ID3 APIC / FLAC Picture 的 picture type 3 = Cover (front)
+_PICTURE_TYPE_COVER_FRONT = 3
+_COVER_DESC = 'Cover (front)'
+_PNG_MAGIC = b'\x89PNG\r\n\x1a\n'
+
+# LRC 时间标签（[mm:ss] / [mm:ss.xx] / [mm:ss:xx]）
+_LRC_TIME_TAG = re.compile(r'\[\d{1,2}:\d{1,2}([.:]\d+)?\]')
+
+
+@dataclass
+class TagSet:
+    """与容器无关的标签中间表示；None 表示本次不写该字段。"""
+
+    title: str | None = None
+    artist: str | None = None
+    album: str | None = None
+    album_artist: str | None = None
+    date: str | None = None
+    track: int | None = None
+    lyrics: str | None = None
+
+
+def build_tags(info: MusicInfo, fields: list[str] | None) -> TagSet:
+    """按前端勾选的字段构造标签集合；fields 为 None 表示全部写入。"""
+    def want(*names: str) -> bool:
+        return fields is None or any(n in fields for n in names)
+
+    tags = TagSet()
+    if want('title', 'name'):
+        tags.title = info.name or None
+    if want('artist'):
+        tags.artist = info.artists or None
+        tags.album_artist = info.artists or None
+    if want('album'):
+        tags.album = info.album or None
+    if want('date') and info.publish_year:
+        tags.date = str(info.publish_year)
+    if want('lyrics') and info.lyric:
+        # 写入纯歌词：去掉 LRC 时间标签
+        tags.lyrics = _LRC_TIME_TAG.sub('', info.lyric).strip() or None
+    if want('track') and info.track_number > 0:
+        # 只写当前曲号；没有真实专辑总数时不虚构 tracktotal
+        tags.track = info.track_number
+    return tags
+
+
+def write_tags(path: Path, tags: TagSet, cover: bytes | None = None) -> bool:
+    """把标签与封面写入音频文件；失败仅记日志并返回 False（不影响交付主流程）。"""
+    ext = path.suffix.lower()
+    writer = _WRITERS.get(ext)
+    if writer is None:
+        logger.warning(f"跳过元数据写入: 不支持的格式 {ext}")
+        return False
+    if not path.exists():
+        logger.warning(f"跳过元数据写入: 文件不存在 {path}")
+        return False
+    try:
+        writer(path, tags, cover)
+        return True
+    except Exception as e:
+        logger.warning(f"写入元数据失败（{ext}）: {e}")
+        return False
+
+
+# ---------- 各容器实现 ----------
+
+def _write_mp3(path: Path, tags: TagSet, cover: bytes | None) -> None:
+    from mutagen.id3 import (
+        APIC,
+        ID3,
+        TALB,
+        TDRC,
+        TIT2,
+        TPE1,
+        TPE2,
+        TRCK,
+        USLT,
+        ID3NoHeaderError,
+    )
+
+    try:
+        audio = ID3(str(path))
+    except ID3NoHeaderError:
+        audio = ID3()                      # 无 ID3 头的裸音频：新建标签区
+    if tags.title:
+        audio['TIT2'] = TIT2(encoding=3, text=[tags.title])
+    if tags.artist:
+        audio['TPE1'] = TPE1(encoding=3, text=[tags.artist])
+    if tags.album_artist:
+        audio['TPE2'] = TPE2(encoding=3, text=[tags.album_artist])
+    if tags.album:
+        audio['TALB'] = TALB(encoding=3, text=[tags.album])
+    if tags.date:
+        audio['TDRC'] = TDRC(encoding=3, text=[tags.date])
+    if tags.track:
+        audio['TRCK'] = TRCK(encoding=3, text=[str(tags.track)])
+    if tags.lyrics:
+        audio['USLT'] = USLT(encoding=3, lang='eng', desc='', text=tags.lyrics)
+    if cover:
+        audio['APIC'] = APIC(encoding=3, mime=_cover_mime(cover),
+                             type=_PICTURE_TYPE_COVER_FRONT,
+                             desc=_COVER_DESC, data=cover)
+    # ID3v2.3 与 ffmpeg 时代的 -id3v2_version 3 保持一致（mutagen 会自动把
+    # TDRC 降级为 TYER/TDAT）；不写 v1 标签以免在文件尾追加 128 字节
+    audio.save(str(path), v2_version=3)
+
+
+def _write_flac(path: Path, tags: TagSet, cover: bytes | None) -> None:
+    from mutagen.flac import FLAC
+
+    audio = FLAC(str(path))
+    _set_vorbis_comments(audio, tags)
+    if cover:
+        audio.clear_pictures()
+        audio.add_picture(_make_picture(cover))
+    audio.save()
+
+
+def _write_m4a(path: Path, tags: TagSet, cover: bytes | None) -> None:
+    from mutagen.mp4 import MP4, MP4Cover
+
+    audio = MP4(str(path))
+    mapping = {
+        '\xa9nam': tags.title,
+        '\xa9ART': tags.artist,
+        'aART': tags.album_artist,
+        '\xa9alb': tags.album,
+        '\xa9day': tags.date,
+        '\xa9lyr': tags.lyrics,
+    }
+    for key, value in mapping.items():
+        if value:
+            audio[key] = [value]
+    if tags.track:
+        audio['trkn'] = [(tags.track, 0)]   # 不虚构 tracktotal
+    if cover:
+        image_format = (MP4Cover.FORMAT_PNG if cover.startswith(_PNG_MAGIC)
+                        else MP4Cover.FORMAT_JPEG)
+        audio['covr'] = [MP4Cover(cover, imageformat=image_format)]
+    audio.save()
+
+
+def _write_ogg(path: Path, tags: TagSet, cover: bytes | None) -> None:
+    _write_ogg_stream(path, tags, cover, opus=False)
+
+
+def _write_opus(path: Path, tags: TagSet, cover: bytes | None) -> None:
+    _write_ogg_stream(path, tags, cover, opus=True)
+
+
+def _write_ogg_stream(path: Path, tags: TagSet, cover: bytes | None, *,
+                      opus: bool) -> None:
+    from mutagen.oggopus import OggOpus
+    from mutagen.oggvorbis import OggVorbis
+
+    audio: Any = OggOpus(str(path)) if opus else OggVorbis(str(path))
+    _set_vorbis_comments(audio, tags)
+    if cover:
+        # Ogg 系把封面按 METADATA_BLOCK_PICTURE 规范存成 base64 的 Picture 块
+        audio['metadata_block_picture'] = [
+            base64.b64encode(_make_picture(cover).write()).decode('ascii')]
+    audio.save()
+
+
+# ---------- 小工具 ----------
+
+def _cover_mime(cover: bytes) -> str:
+    return 'image/png' if cover.startswith(_PNG_MAGIC) else 'image/jpeg'
+
+
+def _make_picture(cover: bytes) -> Any:
+    from mutagen.flac import Picture
+
+    pic = Picture()
+    pic.type = _PICTURE_TYPE_COVER_FRONT
+    pic.mime = _cover_mime(cover)
+    pic.desc = _COVER_DESC
+    pic.data = cover
+    return pic
+
+
+def _set_vorbis_comments(audio: Any, tags: TagSet) -> None:
+    """FLAC 与 Ogg 共用 Vorbis comment 字段名。"""
+    mapping = {
+        'title': tags.title,
+        'artist': tags.artist,
+        'albumartist': tags.album_artist,
+        'album': tags.album,
+        'date': tags.date,
+    }
+    for key, value in mapping.items():
+        if value:
+            audio[key] = [value]
+    if tags.track:
+        audio['tracknumber'] = [str(tags.track)]
+    if tags.lyrics:
+        audio['lyrics'] = [tags.lyrics]
+
+
+_WRITERS = {
+    '.mp3': _write_mp3,
+    '.flac': _write_flac,
+    '.m4a': _write_m4a,
+    '.mp4': _write_m4a,
+    '.ogg': _write_ogg,
+    '.opus': _write_opus,
+}
+
+# 与 models 的类型表保持同源：新增容器必须两边同时登记
+assert set(_WRITERS) == set(METADATA_FORMATS), '标签写入表与 METADATA_FORMATS 不一致'
diff --git a/pyproject.toml b/pyproject.toml
index cd16ec2..fe718cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,9 @@ dependencies = [
     "qrcode>=7.0,<8.3",
     "python-multipart>=0.0.9",
     "jinja2>=3.1,<4.0",
+    "filetype>=1.2.0",
+    "aria2p>=0.12.1",
+    "mutagen>=1.48.1",
 ]
 
 [dependency-groups]
@@ -24,6 +27,7 @@ dev = [
     "ruff>=0.6",
     "pyright>=1.1.390",
     "httpx>=0.27",
+    "httpx2>=2.13.1",
 ]
 
 # 应用工程（非库）：不把自身装进环境，避免 uv 扫描顶层模块
diff --git a/tests/test_aria2.py b/tests/test_aria2.py
new file mode 100644
index 0000000..dd6f353
--- /dev/null
+++ b/tests/test_aria2.py
@@ -0,0 +1,178 @@
+# -*- coding: utf-8 -*-
+"""aria2 下载后端的单元测试（用假 api 驱动，不需要真实 aria2c 二进制）。
+
+覆盖：
+- aria2c 缺失时 get_backend 静默降级且失败结果被记忆
+- 正常完成路径的进度回调与自动清理
+- 取消 / 体积超限 连带删除残片；任务失败 / 总超时 保留残片供续传
+- 提交失败与 RPC 抖动统一上报为可重试异常
+"""
+from __future__ import annotations
+
+import threading
+
+import pytest
+
+import music_downloader._aria2 as a2
+from core.sync_http import RequestException
+from music_downloader import DownloadCanceled, DownloadException
+
+
+class _FakeDownload:
+    """按预设步进产出状态，模拟 aria2 的 tellStatus 轮询。"""
+
+    def __init__(self, steps):
+        self.gid = 'g1'
+        self._steps = list(steps)
+        self._i = 0
+        self.completed_length = 0
+        self.total_length = 100
+        self.is_complete = False
+        self.has_failed = False
+        self.error_message = ''
+        self.status = 'active'
+
+    def update(self):
+        idx = min(self._i, len(self._steps) - 1)
+        done, complete, failed = self._steps[idx]
+        self._i += 1
+        self.completed_length = done
+        self.is_complete = complete
+        self.has_failed = failed
+        if failed:
+            self.status = 'error'
+            self.error_message = 'boom'
+
+
+class _FakeAPI:
+    def __init__(self, download, fail_submit=False, fail_update=False):
+        self.download = download
+        self.removed: list[tuple[str, bool, bool]] = []
+        self.submitted: tuple[list[str], dict[str, str]] | None = None
+        self._fail_submit = fail_submit
+        self._fail_update = fail_update
+
+    def add_uris(self, uris, options=None):
+        if self._fail_submit:
+            raise RuntimeError('rpc down')
+        self.submitted = (list(uris), options or {})
+        return self.download
+
+    def remove(self, downloads, force=False, files=False):
+        self.removed.append((downloads[0].gid, force, files))
+
+
+class _FailUpdateDownload(_FakeDownload):
+    def update(self):
+        raise RuntimeError('rpc jitter')
+
+
+class _FakeProc:
+    def poll(self):
+        return 0
+
+    def terminate(self):
+        pass
+
+    def kill(self):
+        pass
+
+    def wait(self, timeout=None):
+        return 0
+
+
+def _backend(monkeypatch, steps, **kw):
+    monkeypatch.setattr(a2.time, 'sleep', lambda _s: None)
+    dl = _FailUpdateDownload([]) if kw.get('fail_update') else _FakeDownload(steps)
+    api = _FakeAPI(dl, fail_submit=kw.get('fail_submit', False))
+    return a2.Aria2Backend(api, _FakeProc(), 6800), api
+
+
+# ---------- 降级 ----------
+
+def test_get_backend_degrades_without_binary(monkeypatch):
+    monkeypatch.setattr(a2.shutil, 'which', lambda _n: None)
+    monkeypatch.setattr(a2, '_backend', None)
+    monkeypatch.setattr(a2, '_unavailable', False)
+    assert a2.get_backend() is None
+    assert a2.get_backend() is None      # 失败结果被记忆，不反复拉起进程
+
+
+def test_free_port_is_in_valid_range():
+    assert 0 < a2._free_port() < 65536
+
+
+# ---------- 完成路径 ----------
+
+def test_fetch_reports_progress_and_completes(monkeypatch, tmp_path):
+    be, api = _backend(monkeypatch, [(50, False, False), (100, True, False)])
+    seen = []
+    be.fetch('http://x/y.mp3', tmp_path / 'y.part',
+             progress_cb=lambda done, total: seen.append((done, total)))
+    assert seen == [(50, 100), (100, 100)]
+    assert api.removed == []                                  # 完成不需要中止
+    assert not (tmp_path / 'y.part.aria2').exists()           # 控制文件已兜底清理
+    submitted = api.submitted
+    assert submitted is not None
+    options = submitted[1]
+    assert options['continue'] == 'true'                      # 续传选项已下发
+    assert options['max-connection-per-server'] == str(a2._SPLIT)
+
+
+def test_progress_callback_exception_is_swallowed(monkeypatch, tmp_path):
+    be, _api = _backend(monkeypatch, [(100, True, False)])
+
+    def boom(_d, _t):
+        raise RuntimeError('cb')
+
+    be.fetch('http://x/y.mp3', tmp_path / 'y.part', progress_cb=boom)   # 不应抛出
+
+
+# ---------- 取消 / 守卫 / 失败 ----------
+
+def test_fetch_maps_cancel_and_drops_partial(monkeypatch, tmp_path):
+    be, api = _backend(monkeypatch, [(10, False, False)])
+    ev = threading.Event()
+    ev.set()
+    with pytest.raises(DownloadCanceled):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part', cancel_event=ev)
+    assert api.removed == [('g1', True, True)]
+
+
+def test_fetch_guards_size_and_drops_partial(monkeypatch, tmp_path):
+    be, api = _backend(monkeypatch, [(700, False, False)])
+    with pytest.raises(DownloadException):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part', max_bytes=500)
+    assert api.removed == [('g1', True, True)]
+
+
+def test_fetch_failure_is_retryable_and_keeps_partial(monkeypatch, tmp_path):
+    be, api = _backend(monkeypatch, [(10, False, True)])
+    with pytest.raises(RequestException):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part')
+    assert api.removed == []                                  # 残片保留，供下轮续传
+
+
+def test_fetch_timeout_is_retryable(monkeypatch, tmp_path):
+    be, api = _backend(monkeypatch, [(10, False, False)])     # 永不完成
+    with pytest.raises(RequestException):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part', timeout=-1)
+    assert api.removed == [('g1', True, False)]               # 超时中止但保留残片
+
+
+def test_fetch_submit_failure_is_retryable(monkeypatch, tmp_path):
+    be, _api = _backend(monkeypatch, [], fail_submit=True)
+    with pytest.raises(RequestException):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part')
+
+
+def test_fetch_update_failure_is_retryable(monkeypatch, tmp_path):
+    be, _api = _backend(monkeypatch, [], fail_update=True)
+    with pytest.raises(RequestException):
+        be.fetch('http://x/y.mp3', tmp_path / 'y.part')
+
+
+def test_close_is_idempotent(monkeypatch):
+    be, _api = _backend(monkeypatch, [])
+    be.close()
+    be.close()
diff --git a/tests/test_tagging.py b/tests/test_tagging.py
new file mode 100644
index 0000000..da5ce6c
--- /dev/null
+++ b/tests/test_tagging.py
@@ -0,0 +1,188 @@
+# -*- coding: utf-8 -*-
+"""标签写入（mutagen）与内容嗅探（filetype）的单元测试。
+
+覆盖：
+- build_tags 的字段勾选、name/title 别名、LRC 时间标签剔除、曲号/年份缺省
+- write_tags 的失败路径（不支持的扩展名 / 文件不存在）
+- MP3 与 FLAC 的真实往返（写入后按标签读回）
+- _sniff_audio_header 对音频容器放行、对 CDN 错误页/JSON/空文件拒绝
+"""
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+
+from music_downloader import MusicInfo
+from music_downloader._http import _sniff_audio_header
+from music_downloader.tagging import TagSet, build_tags, write_tags
+
+# 最小合法 FLAC：fLaC 魔数 + 一个 34 字节的 STREAMINFO（last-block 标志置位）。
+# STREAMINFO 不能全零——mutagen 会拒绝采样率为 0 的流；此处填 44100Hz/2ch/16bit：
+#   min_blocksize=4096 max_blocksize=4096 min_framesize=1000 max_framesize=2000
+#   随后 8 字节打包 (sample_rate 20bit | channels-1 3bit | bps-1 5bit | total 36bit)
+_STREAMINFO = bytes.fromhex(
+    '1000' '1000' '0003e8' '0007d0' '0ac442f00000ac44' + '00' * 16)
+assert len(_STREAMINFO) == 34
+_MINIMAL_FLAC = b'fLaC' + bytes([0x80, 0x00, 0x00, 0x22]) + _STREAMINFO
+
+# 最小 JPEG 头（仅用于标签写入，不参与解码）
+_JPEG = b'\xff\xd8\xff\xe0' + b'\x00' * 32
+
+
+def _info(**kw) -> MusicInfo:
+    base: dict[str, Any] = {
+        'id': 1, 'name': '歌名', 'artists': '歌手', 'album': '专辑', 'pic_url': '',
+        'duration': 200, 'track_number': 3,
+        'download_url': 'http://example.invalid/x', 'file_type': 'mp3',
+        'file_size': 0, 'quality': 'standard',
+        'lyric': '[00:12.34]第一行\n[00:15.00]第二行', 'tlyric': '',
+        'publish_year': 2024,
+    }
+    base.update(kw)
+    return MusicInfo(**base)
+
+
+# ---------- build_tags ----------
+
+def test_build_tags_all_fields():
+    tags = build_tags(_info(), None)
+    assert tags.title == '歌名'
+    assert tags.artist == '歌手'
+    assert tags.album_artist == '歌手'
+    assert tags.album == '专辑'
+    assert tags.date == '2024'
+    assert tags.track == 3
+    assert tags.lyrics == '第一行\n第二行'      # LRC 时间标签已剔除
+
+
+def test_build_tags_respects_selection():
+    tags = build_tags(_info(), ['title'])
+    assert tags.title == '歌名'
+    assert tags.artist is None
+    assert tags.album is None
+    assert tags.lyrics is None
+    assert tags.track is None
+
+
+def test_build_tags_accepts_name_alias():
+    assert build_tags(_info(), ['name']).title == '歌名'
+
+
+@pytest.mark.parametrize('kw, field', [
+    ({'track_number': 0}, 'track'),
+    ({'publish_year': None}, 'date'),
+    ({'lyric': ''}, 'lyrics'),
+    ({'lyric': '[00:01.00]'}, 'lyrics'),        # 只有时间标签 → 清洗后为空
+])
+def test_build_tags_omits_empty_values(kw, field):
+    assert getattr(build_tags(_info(**kw), None), field) is None
+
+
+# ---------- write_tags ----------
+
+def test_write_tags_rejects_unsupported_extension(tmp_path):
+    p = tmp_path / 'a.wav'
+    p.write_bytes(b'RIFF' + b'\x00' * 8)
+    assert write_tags(p, TagSet(title='x')) is False
+
+
+def test_write_tags_returns_false_when_missing(tmp_path):
+    assert write_tags(tmp_path / 'nope.mp3', TagSet(title='x')) is False
+
+
+def test_write_tags_mp3_roundtrip(tmp_path):
+    from mutagen.id3 import ID3
+
+    p = tmp_path / 'a.mp3'
+    ID3().save(str(p))          # 构造一个只含 ID3 标签区的合法 mp3
+    tags = TagSet(title='T', artist='A', album='B', album_artist='A2',
+                  date='2020', track=2, lyrics='L')
+    assert write_tags(p, tags, cover=_JPEG) is True
+
+    got = ID3(str(p))
+    assert got['TIT2'].text[0] == 'T'
+    assert got['TPE1'].text[0] == 'A'
+    assert got['TPE2'].text[0] == 'A2'
+    assert got['TALB'].text[0] == 'B'
+    assert got['TRCK'].text[0] == '2'
+    # USLT/APIC 的 HashKey 带语言/描述后缀，须用 getall 取
+    assert got.getall('USLT')[0].text == 'L'
+    assert got.getall('APIC')[0].mime == 'image/jpeg'
+
+
+def test_write_tags_mp3_keeps_untouched_frames(tmp_path):
+    from mutagen.id3 import ID3, TXXX
+
+    p = tmp_path / 'a.mp3'
+    audio = ID3()
+    audio['TXXX:keep'] = TXXX(encoding=3, desc='keep', text=['v'])
+    audio.save(str(p))
+
+    assert write_tags(p, TagSet(title='T')) is True
+    assert ID3(str(p))['TXXX:keep'].text[0] == 'v'   # 未触及的帧被保留
+
+
+def test_write_tags_flac_roundtrip(tmp_path):
+    from mutagen.flac import FLAC
+
+    p = tmp_path / 'a.flac'
+    p.write_bytes(_MINIMAL_FLAC)
+    assert write_tags(p, TagSet(title='T', artist='A', track=4), cover=_JPEG) is True
+
+    got = FLAC(str(p))
+    assert got['title'][0] == 'T'
+    assert got['artist'][0] == 'A'
+    assert got['tracknumber'][0] == '4'
+    assert len(got.pictures) == 1
+    assert got.pictures[0].mime == 'image/jpeg'
+
+
+def test_write_tags_failure_is_swallowed(tmp_path):
+    """写坏文件不应抛异常（主流程靠返回值判断）。"""
+    p = tmp_path / 'broken.flac'
+    p.write_bytes(b'fLaC')          # 截断的 FLAC，解析必然失败
+    assert write_tags(p, TagSet(title='T')) is False
+
+
+# ---------- 内容嗅探 ----------
+
+def test_sniff_accepts_id3(tmp_path):
+    p = tmp_path / 'x.mp3'
+    p.write_bytes(b'ID3\x03\x00\x00\x00' + b'\x00' * 64)
+    assert _sniff_audio_header(p) is True
+
+
+def test_sniff_accepts_flac(tmp_path):
+    p = tmp_path / 'x.flac'
+    p.write_bytes(_MINIMAL_FLAC)
+    assert _sniff_audio_header(p) is True
+
+
+def test_sniff_accepts_ogg(tmp_path):
+    p = tmp_path / 'x.ogg'
+    p.write_bytes(b'OggS' + b'\x00' * 64)
+    assert _sniff_audio_header(p) is True
+
+
+def test_sniff_rejects_risk_json(tmp_path):
+    """CDN 风控 JSON 不能被当成音频交付。"""
+    p = tmp_path / 'x.mp3'
+    p.write_bytes(b'{"code": 403, "msg": "risk"}')
+    assert _sniff_audio_header(p) is False
+
+
+def test_sniff_rejects_html_error_page(tmp_path):
+    p = tmp_path / 'x.mp3'
+    p.write_bytes(b'<!DOCTYPE html><html><body>403</body></html>')
+    assert _sniff_audio_header(p) is False
+
+
+def test_sniff_rejects_empty_file(tmp_path):
+    p = tmp_path / 'x.mp3'
+    p.write_bytes(b'')
+    assert _sniff_audio_header(p) is False
+
+
+def test_sniff_rejects_missing_file(tmp_path):
+    assert _sniff_audio_header(tmp_path / 'nope.mp3') is False
diff --git a/uv.lock b/uv.lock
index 6968d8d..10fcd93 100644
--- a/uv.lock
+++ b/uv.lock
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     { url = "https://files.pythonhosted.org/packages/12/b8/4bd346e22b28902df4d651910f5242c28d84e4a5c2435ca5c3f797ed7e2e/anyio-4.15.1-py3-none-any.whl", hash = "sha256:6152fdbbf9a77fdec97731721bebf7c4c44f7c29b424b0065826173efc7ed101", size = 132079, upload-time = "2026-09-05T10:42:37.923Z" },
 ]
 
+[[package]]
+name = "aria2p"
+version = "0.12.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "loguru" },
+    { name = "platformdirs" },
+    { name = "requests" },
+    { name = "websocket-client" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/f7/d5/68f38791f44e5caf5c7c9576aea61d77cf940a060135358dcadb5345dd9c/aria2p-0.12.1.tar.gz", hash = "sha256:1521ccba4a4bb164a023f4c4213513dc3e6f47b91927f5e49dd50678da8c1294", size = 270595, upload-time = "2024-12-25T17:06:34.571Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/dc/95/1ec57df6c52152fb4c776da5fbb2896f19af52de3776899d91e7140e7654/aria2p-0.12.1-py3-none-any.whl", hash = "sha256:96d31c1edd3c9e0edf725b7adeb0b9fb9b6ae102f3c228040d773b43837913a2", size = 88242, upload-time = "2024-12-25T17:06:30.995Z" },
+]
+
 [[package]]
 name = "attrs"
 version = "26.1.0"
@@ -276,6 +291,137 @@ wheels = [
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 ]
 
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+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/b3/8f/705086c9d734d3b663af0e9bb3d4de6578d08f46b1b101c2442fd9aecaa2/win32_setctime-1.2.0.tar.gz", hash = "sha256:ae1fdf948f5640aae05c511ade119313fb6a30d7eabe25fef9764dca5873c4c0", size = 4867, upload-time = "2024-12-07T15:28:28.314Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e1/07/c6fe3ad3e685340704d314d765b7912993bcb8dc198f0e7a89382d37974b/win32_setctime-1.2.0-py3-none-any.whl", hash = "sha256:95d644c4e708aba81dc3704a116d8cbc974d70b3bdb8be1d150e36be6e9d1390", size = 4083, upload-time = "2024-12-07T15:28:26.465Z" },
+]
+
 [[package]]
 name = "yarl"
 version = "1.25.1"
@@ -1532,10 +1808,13 @@ dependencies = [
     { name = "aiofiles" },
     { name = "aiohttp" },
     { name = "aiosqlite" },
+    { name = "aria2p" },
     { name = "cryptography" },
     { name = "fastapi" },
+    { name = "filetype" },
     { name = "itsdangerous" },
     { name = "jinja2" },
+    { name = "mutagen" },
     { name = "python-multipart" },
     { name = "qrcode" },
     { name = "uvicorn", extra = ["standard"] },
@@ -1544,6 +1823,7 @@ dependencies = [
 [package.dev-dependencies]
 dev = [
     { name = "httpx" },
+    { name = "httpx2" },
     { name = "pyright" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -1555,10 +1835,13 @@ requires-dist = [
     { name = "aiofiles", specifier = ">=24.1" },
     { name = "aiohttp", specifier = ">=3.10,<4.0" },
     { name = "aiosqlite", specifier = ">=0.20,<1.0" },
+    { name = "aria2p", specifier = ">=0.12.1" },
     { name = "cryptography", specifier = ">=50.0,<51.0" },
     { name = "fastapi", specifier = ">=0.115,<1.0" },
+    { name = "filetype", specifier = ">=1.2.0" },
     { name = "itsdangerous", specifier = ">=2.2,<3.0" },
     { name = "jinja2", specifier = ">=3.1,<4.0" },
+    { name = "mutagen", specifier = ">=1.48.1" },
     { name = "python-multipart", specifier = ">=0.0.9" },
     { name = "qrcode", specifier = ">=7.0,<8.3" },
     { name = "uvicorn", extras = ["standard"], specifier = ">=0.30,<1.0" },
@@ -1567,6 +1850,7 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "httpx", specifier = ">=0.27" },
+    { name = "httpx2", specifier = ">=2.13.1" },
     { name = "pyright", specifier = ">=1.1.390" },
     { name = "pytest", specifier = ">=8.0" },
     { name = "pytest-asyncio", specifier = ">=0.24" },