fix(bilibili): keep long videos playing when the CDN drops the stream (#161)

Long B站 videos (2-3 h) still stopped ~15-20 min in, the same symptom as
#89. Reconnecting to the same URL is not enough once the CDN session is
gone, so:

- Prefer an upos/cos mirror from baseUrl + backupUrl over PCDN hosts
  (*.mcdn.bilivideo.cn, *.szbdyd.com), which are the ones that cut off.
- When a B站 track ends more than 30 s before its known duration, fetch
  a fresh URL and resume at the current position instead of advancing.
  Up to 3 attempts without real progress, then advance as before; a
  track the user started meanwhile is never clobbered.
- Seek B站 URLs input-side (-ss before -i). Their CDN serves Range, so a
  resume jumps to the byte offset instead of re-downloading everything
  before it (measured locally: 0.2 s vs a full-file download at 1.5 h
  into a 2 h fMP4), which would otherwise trip the 60 s stall watchdog.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -65,22 +65,22 @@
 先装好 Node.js，其余依赖（含内置 FFmpeg）全部自动安装。
 
 ```
-1. 安装 Node.js 20 LTS 或 22 LTS（https://nodejs.org/ 或 https://nodejs.cn/）
+1. 安装 Node.js 22 LTS（https://nodejs.org/ 或 https://nodejs.cn/）
 2. 下载或 clone 本项目
 3. 双击 scripts\setup.bat      （安装依赖并构建，不含 Node.js 本身）
 4. 双击 scripts\start.bat      （启动机器人）
 5. 浏览器打开 http://localhost:3000
 ```
 
-> **先装 Node.js 20 LTS 或 22 LTS**（[nodejs.org](https://nodejs.org/) / 国内镜像 [nodejs.cn](https://nodejs.cn/)）。`setup.bat` 检测到没装 Node 时会给出下载地址并退出，不会替你安装。
+> **先装 Node.js 22 LTS**（[nodejs.org](https://nodejs.org/) / 国内镜像 [nodejs.cn](https://nodejs.cn/)）。`setup.bat` 检测到没装 Node 时会给出下载地址并退出，不会替你安装。
 >
 > 之后 `setup.bat` 会运行 `npm install` 安装所有依赖（包括内置 FFmpeg），按当前 Node 版本准备好原生模块，最后构建项目。之后每次只需双击 `start.bat` 启动。
 >
-> 更新的 Node 大版本（如 24）也能用，但通常没有现成的 opus / better-sqlite3 预编译包，安装脚本会改用源码编译，需要 C/C++ 构建工具且耗时更久——所以推荐 20 / 22 LTS。**装好之后不要再换 Node 大版本**：原生模块只能在编译它的那个版本上加载，换版本后必须重新运行 `setup.bat`（脚本会自动检测并重装，见下方常见问题）。
+> **Node 20 已不再支持**：better-sqlite3 从 12.10.0 起不再发布它那个 ABI（115）的预编译包，装起来必须先备好 Python + C++ 构建工具（[#152](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/152)）。Node 24 及更新的大版本能用，但 @discordjs/opus 0.10.0 同样没有 Node 24（ABI 137）的预编译包，安装脚本会改用源码编译，需要构建工具且耗时更久——所以推荐 22 LTS。**装好之后不要再换 Node 大版本**：原生模块只能在编译它的那个版本上加载，换版本后必须重新运行 `setup.bat`（脚本会自动检测并重装，见下方常见问题）。
 
 ### 方式二：手动安装（所有系统）
 
-**前置条件：** [Node.js 20 LTS 或 22 LTS](https://nodejs.org/)（推荐；更新的大版本可用但需要源码编译原生模块）和一个 TeamSpeak 服务器（TS3/TS5/TS6 均可）。
+**前置条件：** [Node.js 22 LTS](https://nodejs.org/)（Node 24 及更新版本也能用，但需要源码编译原生模块；Node 20 已不再支持）和一个 TeamSpeak 服务器（TS3/TS5/TS6 均可）。
 FFmpeg **已自动内置**，无需手动安装。
 
 ```bash
@@ -510,7 +510,7 @@ teamspeak-music-bot/
 
 | 层级 | 技术 |
 |------|------|
-| **运行时** | Node.js 20 / 22 LTS, TypeScript 5 |
+| **运行时** | Node.js 22 LTS（推荐）, TypeScript 5 |
 | **后端框架** | Express 4, WebSocket (ws) |
 | **数据库** | better-sqlite3 (SQLite) |
 | **音频处理** | FFmpeg (ffmpeg-static 内置), @discordjs/opus |

package.json

@@ -4,7 +4,7 @@
   "description": "TeamSpeak music bot with NetEase Cloud Music and QQ Music support",
   "type": "module",
   "engines": {
-    "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+    "node": "^22.12.0 || >=24.0.0"
   },
   "scripts": {
     "dev": "tsx watch src/index.ts",

scripts/check-native.mjs

@@ -23,6 +23,7 @@ import { execFileSync } from "node:child_process";
 import { existsSync, readFileSync } from "node:fs";
 import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
+import { createLineWriter } from "./lib/console-log.mjs";
 
 const ROOT = join(dirname(fileURLToPath(import.meta.url)), "..");
 const NODE_MODULES = join(ROOT, "node_modules");
@@ -106,7 +107,11 @@ for (const spec of REQUIRED) {
 function report() {
   const stamp = readStamp();
   const mismatch = broken.find((b) => b.abiMismatch);
-  const out = (line) => process.stderr.write(`${line}\n`);
+  // Never let a failed console write become an uncaught error and replace this
+  // report with a stack trace - the console that cannot print the Chinese half
+  // of these lines is exactly the one a user needs the English half from.
+  // See scripts/lib/console-log.mjs and issue #152.
+  const out = createLineWriter(process.stderr);
 
   out("");
   out("============================================================");

scripts/docker/Dockerfile

@@ -4,7 +4,7 @@
 # ==========================================
 
 # --- Stage 1: Build backend + frontend ---
-FROM node:20-slim AS builder
+FROM node:22-slim AS builder
 
 # Install build tools for native modules (opus, better-sqlite3)
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -30,7 +30,7 @@ RUN npm run build
 RUN rm -rf node_modules && npm ci --production && npm cache clean --force
 
 # --- Stage 2: Production image ---
-FROM node:20-slim
+FROM node:22-slim
 
 # Install system FFmpeg — the ffmpeg-static npm package bundles a pre-compiled
 # binary that can SIGSEGV inside Docker (incompatible glibc / missing libs).
@@ -51,6 +51,8 @@ COPY --from=builder /app/node_modules ./node_modules
 # goes through npm, but an interactive `docker exec ... npm start` would
 # otherwise die on a missing script rather than starting the bot.
 COPY --from=builder /app/scripts/check-native.mjs ./scripts/check-native.mjs
+# ...and the module it imports for crash-proof logging.
+COPY --from=builder /app/scripts/lib/console-log.mjs ./scripts/lib/console-log.mjs
 
 # Data directory for database, cookies, logs
 RUN mkdir -p /app/data

scripts/download-binaries.mjs

@@ -51,6 +51,7 @@ import { Readable } from "node:stream";
 import { execFileSync, execSync } from "node:child_process";
 import { createRequire } from "node:module";
 import { fileURLToPath } from "node:url";
+import { createLineWriter } from "./lib/console-log.mjs";
 
 const ROOT = join(dirname(fileURLToPath(import.meta.url)), "..");
 const NODE_MODULES = join(ROOT, "node_modules");
@@ -61,6 +62,11 @@ const CDN = process.argv[2] || "https://cdn.npmmirror.com/binaries";
 const PLATFORM = process.platform;
 const ARCH = process.arch;
 const NODE_ABI = process.versions.modules;
+const NODE_MAJOR = Number(process.versions.node.split(".")[0]);
+/** The newest Node major this project is regularly tested against, and the one
+ *  every required addon currently ships a prebuild for. Keep in sync with
+ *  TESTED_NODE_MAJOR in scripts/setup.bat. */
+const TESTED_NODE_MAJOR = 22;
 
 /** Modules the bot cannot start without. ffmpeg-static is optional: a system
  *  ffmpeg on PATH is a documented fallback, so it only ever produces a WARN. */
@@ -79,10 +85,17 @@ const FFMPEG_MIN_BYTES = 20 * 1024 * 1024;
 // log keeps the full transcript too.
 const ECHO_STDOUT = process.env.TSMB_BINARY_LOG_STDOUT === "1";
 
+// Both writers swallow a failed write instead of letting it become an uncaught
+// 'error' event: a console that cannot print the Chinese half of a line (issue
+// #152) must not be able to abort a whole setup run. The two streams degrade
+// independently, so setup.log keeps the full bilingual transcript either way.
+const writeErr = createLineWriter(process.stderr);
+const writeOut = createLineWriter(process.stdout);
+
 function log(msg) {
   const line = msg === "" ? "" : `  [binary] ${msg}`;
-  process.stderr.write(`${line}\n`);
+  writeErr(line);
-  if (ECHO_STDOUT) process.stdout.write(`${line}\n`);
+  if (ECHO_STDOUT) writeOut(line);
 }
 
 // ---------------------------------------------------------------------------
@@ -401,6 +414,25 @@ function buildFromSource(command) {
   execSync(command, { cwd: ROOT, stdio: ["ignore", "inherit", "inherit"] });
 }
 
+/**
+ * A 404 from the CDN is not a mirror outage: it means this exact package
+ * version publishes no prebuilt binary for the running Node ABI at all.
+ * @discordjs/opus 0.10.0 has no build for Node 24 (ABI 137), so a user on that
+ * major lands in the source-build fallback below and is told to install Python
+ * and a C++ toolchain. Switching Node major is the far cheaper fix, and nothing
+ * else in this output points at it. (better-sqlite3 dropping its Node 20 / ABI
+ * 115 builds in 12.10.0 is why Node 20 is no longer accepted at all.)
+ * See issue #152.
+ */
+function explainMissingPrebuild(name, version, err) {
+  if (!/HTTP 404/.test(err.message)) return;
+  log(`${name}: ${name}@${version} ships no prebuilt binary for Node ${NODE_MAJOR} (ABI ${NODE_ABI})`);
+  log(
+    `${name}: Node ${TESTED_NODE_MAJOR} LTS has one — switching Node is usually much quicker than ` +
+      `setting up a compiler (换用 Node ${TESTED_NODE_MAJOR} LTS 通常比装编译环境快得多)`,
+  );
+}
+
 function buildToolsHint() {
   log("Install build tools first:");
   log("  Windows: npm install --global windows-build-tools  (或安装 Visual Studio Build Tools + Python)");
@@ -521,6 +553,7 @@ async function ensureOpus() {
       log(`${name}: prebuilt binary installed`);
     } catch (cdnErr) {
       log(`${name}: CDN install failed (${cdnErr.message})`);
+      explainMissingPrebuild(name, version, cdnErr);
       log(`${name}: falling back to a source build — 'npm rebuild ${name}' (可能需要几分钟)`);
       buildFromSource(`npm rebuild ${name}`);
     }
@@ -591,6 +624,7 @@ async function ensureBetterSqlite3() {
       log(`${name}: prebuilt binary installed (${humanSize(dest)})`);
     } catch (cdnErr) {
       log(`${name}: CDN install failed (${cdnErr.message})`);
+      explainMissingPrebuild(name, version, cdnErr);
       log(`${name}: falling back to a source build — 'npm rebuild ${name} --build-from-source' (可能需要几分钟)`);
       buildFromSource(`npm rebuild ${name} --build-from-source`);
     }
@@ -661,10 +695,9 @@ try {
   // that same loop. Run these concurrently and the first module to fall back to
   // a source build kills every download still in flight — the connection is
   // healthy, the timer just never got a chance to be reset. That is not a rare
-  // race: npmmirror has no opus prebuild for ABI 137 (Node 24) and no
+  // race: @discordjs/opus 0.10.0 has no prebuild for ABI 137, so on Node 24 that
-  // better-sqlite3 prebuild for ABI 115 (Node 20), so on both of the Node
+  // module 404s within ~100ms and starts building while ffmpeg's ~80MB download
-  // versions this project supports, one module 404s within ~100ms and starts
+  // is still going. ffmpeg is optional,
-  // building while ffmpeg's ~80MB download is still going. ffmpeg is optional,
   // so the spurious failure used to be swallowed as a WARN and setup still
   // reported success — leaving the user with no ffmpeg and no working playback.
   // Nothing here benefits from overlap anyway: every probe is execFileSync.

scripts/lib/console-log.mjs

@@ -0,0 +1,142 @@
+/**
+ * Crash-proof line logging for the setup scripts.
+ *
+ * WHY THIS EXISTS (issue #152)
+ * ----------------------------
+ * setup.bat runs `chcp 65001` and shows progress on stderr. Some Windows
+ * consoles - Windows Server 2012 R2 above all - cannot render non-ASCII text in
+ * that code page and the OS fails the write with EIO. `process.stderr` is an
+ * ordinary stream, so that EIO arrives as an 'error' event, and a stream with
+ * no 'error' listener rethrows it as an uncaught exception:
+ *
+ *     Error: write EIO
+ *         at afterWriteDispatched (node:internal/stream_base_commons:159:15)
+ *         ...
+ *         at log (scripts/download-binaries.mjs:84:18)
+ *         at ensureFfmpeg (scripts/download-binaries.mjs:451:5)
+ *
+ * That is setup killing itself inside its own progress logging, on the first
+ * line of the run that happened to contain Chinese - nothing was wrong with the
+ * download it was about to start.
+ *
+ * So: listen for the error and degrade instead of dying.
+ *   full  -> ascii : drop the CJK the console choked on, keep the English half
+ *   ascii -> off   : the stream is simply gone (closed pipe) - stay quiet
+ * Each stream degrades on its own, so a console that gives up does not cost
+ * setup.log its full bilingual transcript: that stdout is a redirected file.
+ */
+
+const HAS_NON_ASCII = /[^\x00-\x7F]/;
+
+/** Placeholders for a removed run: one that separated words, one that did not. */
+const SPACED = "\u0000";
+const TIGHT = "\u0001";
+
+/** Punctuation the bilingual strings use that has an obvious ASCII twin. */
+const PUNCTUATION = new Map(
+  Object.entries({
+    "—": "-",
+    "–": "-",
+    "…": "...",
+    "“": '"',
+    "”": '"',
+    "‘": "'",
+    "’": "'",
+    "，": ",",
+    "。": ".",
+    "、": ",",
+    "：": ":",
+    "；": ";",
+    "（": "(",
+    "）": ")",
+    "！": "!",
+    "？": "?",
+    "←": "<-",
+    "→": "->",
+    "×": "x",
+  }),
+);
+
+/**
+ * Best-effort ASCII rendering of a log line, for a console that cannot print
+ * anything else. Returns null when nothing worth printing survives - every
+ * Chinese-only line in these scripts sits directly beside an English line
+ * saying the same thing, so dropping it loses no information.
+ */
+export function toAsciiFallback(text) {
+  if (!HAS_NON_ASCII.test(text)) return text;
+
+  let out = "";
+  for (const ch of text) out += PUNCTUATION.get(ch) ?? ch;
+
+  out = out
+    .replace(/[\u0000\u0001]/g, "")
+    // Mark each removed run rather than just deleting it, so the tidy-up below
+    // can tell "a separator that introduced text we dropped" from "a separator
+    // that belongs to the English half". SPACED was holding two ASCII words
+    // apart; TIGHT was hugging a bracket or a comma.
+    .replace(/[ \t]*[^\x00-\x7F]+[ \t]*/g, (run) =>
+      /^[ \t]/.test(run) && /[ \t]$/.test(run) ? SPACED : TIGHT,
+    )
+    // "(可能需要几分钟)" — the parentheses held nothing else.
+    .replace(/[ \t]*\([ \t]*(?:[\u0000\u0001][ \t]*)+\)/g, "")
+    // "FAILED — 编译失败", "(~80 MB, 请耐心等待)" — drop the trailing marks along
+    // with the separators that were only ever there to introduce them.
+    .replace(/[ \t]*[-,;:]*[ \t]*(?:[\u0000\u0001][ \t,;:-]*)+(?=[)\]]|$)/gm, "")
+    .replace(/\u0000/g, " ")
+    .replace(/\u0001/g, "")
+    .replace(/[ \t]+$/gm, "");
+
+  return /[A-Za-z0-9]/.test(out) ? out : null;
+}
+
+/** One degradation state per stream, shared by every writer built on it. */
+const guards = new WeakMap();
+
+function guardFor(stream) {
+  const existing = guards.get(stream);
+  if (existing) return existing;
+
+  const guard = { mode: "full" };
+  guards.set(stream, guard);
+  try {
+    // The whole point: without this listener the next EIO/EPIPE is fatal.
+    stream.on("error", () => degrade(guard));
+  } catch {
+    /* not an EventEmitter - the try/catch around write() still guards us */
+  }
+  return guard;
+}
+
+function degrade(guard) {
+  guard.mode = guard.mode === "full" ? "ascii" : "off";
+}
+
+/**
+ * Build a `writeLine(text)` that appends a newline, never throws, and never
+ * lets a failed console write take the process down with it.
+ * Returns true when the line reached the stream.
+ */
+export function createLineWriter(stream) {
+  const guard = guardFor(stream);
+
+  return function writeLine(text) {
+    if (guard.mode === "off") return false;
+
+    let line = text;
+    if (guard.mode === "ascii") {
+      line = toAsciiFallback(text);
+      if (line === null) return false;
+    }
+
+    try {
+      stream.write(`${line}\n`);
+      return true;
+    } catch {
+      // A synchronous throw (EBADF on a closed handle) never reaches the
+      // 'error' listener, so degrade here too.
+      degrade(guard);
+      return false;
+    }
+  };
+}

scripts/lib/console-log.test.mjs

@@ -0,0 +1,133 @@
+import { EventEmitter } from "node:events";
+import { describe, expect, it, vi } from "vitest";
+
+import { createLineWriter, toAsciiFallback } from "./console-log.mjs";
+
+/** Stand-in for process.stderr: an EventEmitter with a write() we can steer. */
+function fakeStream() {
+  const stream = new EventEmitter();
+  stream.written = [];
+  stream.throwOnWrite = false;
+  stream.write = (chunk) => {
+    if (stream.throwOnWrite) throw new Error("EBADF");
+    stream.written.push(chunk);
+    return true;
+  };
+  return stream;
+}
+
+describe("toAsciiFallback", () => {
+  it("leaves ASCII lines exactly as they are", () => {
+    const line = "  [binary] better-sqlite3: OK (loads under v22.23.2, ABI 127)";
+    expect(toAsciiFallback(line)).toBe(line);
+    expect(toAsciiFallback("")).toBe("");
+  });
+
+  it("keeps the English half of the line that crashed setup in #152", () => {
+    expect(
+      toAsciiFallback(
+        "  [binary] ffmpeg-static: GET https://cdn/ffmpeg.gz  (~80 MB, 这一步比较慢,请耐心等待)",
+      ),
+    ).toBe("  [binary] ffmpeg-static: GET https://cdn/ffmpeg.gz  (~80 MB)");
+  });
+
+  it("drops parentheses and separators left stranded by the removed text", () => {
+    expect(
+      toAsciiFallback("  [binary] better-sqlite3: falling back — 'npm rebuild' (可能需要几分钟)"),
+    ).toBe("  [binary] better-sqlite3: falling back - 'npm rebuild'");
+    expect(
+      toAsciiFallback("  Windows: npm install --global windows-build-tools  (或安装 VS Build Tools)"),
+    ).toBe("  Windows: npm install --global windows-build-tools  (VS Build Tools)");
+  });
+
+  it("drops a Chinese-only line, which always has an English twin beside it", () => {
+    expect(toAsciiFallback("必需的原生模块不可用,机器人无法启动 —— 请查看上面的错误信息。")).toBeNull();
+  });
+
+  it("preserves the indentation the summary is aligned on, and drops the dangling dash", () => {
+    expect(toAsciiFallback("  - better-sqlite3     FAILED — 编译失败")).toBe(
+      "  - better-sqlite3     FAILED",
+    );
+  });
+
+  it("keeps a separator that belongs to the English half", () => {
+    expect(toAsciiFallback("Summary — Node v22.0.0 / ABI 127 / win32-x64:")).toBe(
+      "Summary - Node v22.0.0 / ABI 127 / win32-x64:",
+    );
+  });
+});
+
+describe("createLineWriter", () => {
+  it("appends a newline and reports the write", () => {
+    const stream = fakeStream();
+    expect(createLineWriter(stream)("hello")).toBe(true);
+    expect(stream.written).toEqual(["hello\n"]);
+  });
+
+  it("survives the EIO that killed setup: an 'error' event must not throw", () => {
+    const stream = fakeStream();
+    createLineWriter(stream);
+    expect(stream.listenerCount("error")).toBe(1);
+    expect(() => stream.emit("error", Object.assign(new Error("write EIO"), { code: "EIO" }))).not.toThrow();
+  });
+
+  it("falls back to ASCII once the console has refused a line", () => {
+    const stream = fakeStream();
+    const write = createLineWriter(stream);
+    write("  [binary] GET https://cdn/ffmpeg.gz  (~80 MB, 这一步比较慢,请耐心等待)");
+    stream.emit("error", new Error("write EIO"));
+    write("  [binary] GET https://cdn/opus.tar.gz  (~1 MB, 这一步比较慢,请耐心等待)");
+    expect(stream.written).toEqual([
+      "  [binary] GET https://cdn/ffmpeg.gz  (~80 MB, 这一步比较慢,请耐心等待)\n",
+      "  [binary] GET https://cdn/opus.tar.gz  (~1 MB)\n",
+    ]);
+  });
+
+  it("goes quiet after a second failure rather than retrying a dead stream", () => {
+    const stream = fakeStream();
+    const write = createLineWriter(stream);
+    stream.emit("error", new Error("write EIO"));
+    stream.emit("error", new Error("write EPIPE"));
+    expect(write("anything at all")).toBe(false);
+    expect(stream.written).toEqual([]);
+  });
+
+  it("degrades on a synchronous throw too, which never reaches the listener", () => {
+    const stream = fakeStream();
+    const write = createLineWriter(stream);
+    stream.throwOnWrite = true;
+    expect(write("  [binary] 下载中 downloading")).toBe(false);
+    stream.throwOnWrite = false;
+    write("  [binary] 下载中 downloading");
+    expect(stream.written).toEqual(["  [binary] downloading\n"]);
+  });
+
+  it("degrades each stream on its own, so setup.log keeps the full transcript", () => {
+    const console_ = fakeStream();
+    const logFile = fakeStream();
+    const writeConsole = createLineWriter(console_);
+    const writeLog = createLineWriter(logFile);
+    console_.emit("error", new Error("write EIO"));
+
+    const line = "  [binary] ffmpeg-static: 下载完成 done";
+    writeConsole(line);
+    writeLog(line);
+
+    expect(console_.written).toEqual(["  [binary] ffmpeg-static: done\n"]);
+    expect(logFile.written).toEqual([`${line}\n`]);
+  });
+
+  it("never installs a second listener for a stream that already has a writer", () => {
+    const stream = fakeStream();
+    createLineWriter(stream);
+    createLineWriter(stream);
+    expect(stream.listenerCount("error")).toBe(1);
+  });
+
+  it("still guards a stream that is not an EventEmitter", () => {
+    const stream = { write: vi.fn(() => { throw new Error("EBADF"); }) };
+    const write = createLineWriter(stream);
+    expect(() => write("line")).not.toThrow();
+    expect(write("line")).toBe(false);
+  });
+});

scripts/setup.bat

@@ -11,7 +11,7 @@ title TSMusicBot Setup
 :: ============================================================
 
 set "SCRIPT_VERSION=2.2"
-set "MIN_NODE_MAJOR=20"
+set "MIN_NODE_MAJOR=22"
 :: Newest Node major this project is regularly tested against. Anything above
 :: still works, it just may have no prebuilt addons and fall back to a source build.
 set "TESTED_NODE_MAJOR=22"
@@ -67,13 +67,15 @@ for /f "tokens=1 delims=v." %%a in ("%NODE_VER%") do set "NODE_MAJOR=%%a"
 call :log "Node.js version: %NODE_VER%"
 echo [OK] Node.js found: %NODE_VER%
 
-:: The supported floor is not just a major version, so let node decide:
+:: The supported floor is not just a major version, so let node decide.
-:: @honeybbq/teamspeak-client needs >=20.19, @sansenjian/qq-music-api needs
+:: Node 20 was dropped: better-sqlite3 ships no prebuilt binary for its ABI
-:: >=20.17 / >=22.9, and the odd majors (21 / 23) are excluded by
+:: (115) since 12.10.0, so every Node 20 install needed Python and a C++
-:: better-sqlite3 and vitest. Keep this in sync with "engines" in package.json.
+:: toolchain just to get off the ground (issue #152). The odd majors (21 /
-node -e "const v=process.versions.node.split('.').map(Number); process.exit((v[0]===20&&v[1]>=19)||(v[0]===22&&v[1]>=12)||v[0]>=24?0:1)"
+:: 23) are excluded by better-sqlite3 and vitest.
+:: Keep this in sync with "engines" in package.json.
+node -e "const v=process.versions.node.split('.').map(Number); process.exit((v[0]===22&&v[1]>=12)||v[0]>=24?0:1)"
 if errorlevel 1 (
-    call :error "Node.js %NODE_VER% is not supported. Use Node 20.19+ LTS or Node 22.12+ LTS."
+    call :error "Node.js %NODE_VER% is not supported. Use Node 22.12+ LTS or newer."
     echo         Download: https://nodejs.org/  or  https://nodejs.cn/
     pause
     exit /b 1
@@ -86,10 +88,10 @@ if errorlevel 1 (
 :: characters and starts eating the "echo " prefix of following lines.
 :: Bilingual guidance lives in the Node scripts, which print UTF-8 reliably.
 if %NODE_MAJOR% GTR %TESTED_NODE_MAJOR% (
-    echo [WARN] Node %NODE_VER% is newer than the tested LTS line, Node 20 / Node 22.
+    echo [WARN] Node %NODE_VER% is newer than the tested LTS line, Node 22.
     echo        Newer Node majors may have no prebuilt opus / better-sqlite3,
     echo        so setup falls back to a source build - slower, needs C++ build tools.
-    echo        Recommended: Node 20 LTS or Node 22 LTS - https://nodejs.org/ or https://nodejs.cn/
+    echo        Recommended: Node 22 LTS - https://nodejs.org/ or https://nodejs.cn/
     echo        This is only a warning; setup still builds the binaries for %NODE_VER%.
     call :log "[WARN] Node major %NODE_MAJOR% is newer than tested LTS %TESTED_NODE_MAJOR%"
 )

scripts/setup.sh

@@ -32,16 +32,18 @@ echo "[OK] Node.js $(node -v)"
 TESTED_NODE_MAJOR=22
 NODE_MAJOR="$(node -p 'process.versions.node.split(".")[0]')"
 
-# The floor is not just a major version, so let node decide: @honeybbq/teamspeak-client
+# The floor is not just a major version, so let node decide. Node 20 was dropped:
-# needs >=20.19, @sansenjian/qq-music-api needs >=20.17 / >=22.9, and the odd majors
+# better-sqlite3 ships no prebuilt binary for its ABI (115) since 12.10.0, so every
-# (21 / 23) are excluded by better-sqlite3 and vitest. Keep in sync with package.json "engines".
+# Node 20 install needed Python and a C++ toolchain just to get off the ground
-if ! node -e 'const v=process.versions.node.split(".").map(Number); process.exit((v[0]===20&&v[1]>=19)||(v[0]===22&&v[1]>=12)||v[0]>=24?0:1)'; then
+# (issue #152). The odd majors (21 / 23) are excluded by better-sqlite3 and vitest.
-    echo "[ERROR] Node.js $(node -v) is not supported. Use Node 20.19+ LTS or Node 22.12+ LTS."
+# Keep in sync with package.json "engines".
+if ! node -e 'const v=process.versions.node.split(".").map(Number); process.exit((v[0]===22&&v[1]>=12)||v[0]>=24?0:1)'; then
+    echo "[ERROR] Node.js $(node -v) is not supported. Use Node 22.12+ LTS or newer."
     echo "        https://nodejs.org/  |  https://nodejs.cn/"
     exit 1
 fi
 if [ "$NODE_MAJOR" -gt "$TESTED_NODE_MAJOR" ]; then
-    echo "[WARN] Node $(node -v) is newer than the tested LTS line (Node 20 / Node 22)."
+    echo "[WARN] Node $(node -v) is newer than the tested LTS line (Node 22)."
     echo "       新版 Node 可能没有现成的 opus / better-sqlite3 预编译包,"
     echo "       安装时会自动改用源码编译,需要 C/C++ 构建工具,速度较慢。"
     echo "       This is only a warning - setup builds the binaries for $(node -v) either way."

src/audio/player.test.ts

@@ -55,13 +55,21 @@ describe("buildFfmpegArgs", () => {
     expect(idx).toBeLessThan(args.indexOf("-i")); // input options must precede -i
   });
 
-  it("inserts -ss before -i when seekSeconds > 0", () => {
+  it("inserts -ss after -i when seekSeconds > 0", () => {
     const args = buildFfmpegArgs("https://example.com/song.mp3", 42);
     const ssIdx = args.indexOf("-ss");
     const iIdx = args.indexOf("-i");
     expect(ssIdx).toBeGreaterThan(-1);
     expect(args[ssIdx + 1]).toBe("42");
-    expect(ssIdx).toBeLessThan(iIdx);
+    expect(ssIdx).toBeGreaterThan(iIdx);
+  });
+
+  it("seeks B站 streams input-side (before -i) so a resume jumps via Range instead of re-downloading (#161)", () => {
+    const args = buildFfmpegArgs("https://upos-sz-mirrorcos.bilivideo.com/audio.m4s", 3600);
+    const ssIdx = args.indexOf("-ss");
+    expect(args[ssIdx + 1]).toBe("3600");
+    expect(ssIdx).toBeLessThan(args.indexOf("-i"));
+    expect(args.lastIndexOf("-ss")).toBe(ssIdx); // only one -ss
   });
 
   it("does not insert -ss when seekSeconds is 0", () => {

src/audio/player.ts

@@ -76,8 +76,9 @@ export function cleanupTempDir(dir: string): void {
 export function buildFfmpegArgs(url: string, seekSeconds: number): string[] {
   const args: string[] = [];
   const isHttp = /^https?:\/\//i.test(url);
+  const isBilibili = isHttp && (url.includes("bilivideo") || url.includes("bilibili"));
 
-  if (isHttp && (url.includes("bilivideo") || url.includes("bilibili"))) {
+  if (isBilibili) {
     args.push(
       "-headers",
       `Referer: https://www.bilibili.com\r\nUser-Agent: ${BROWSER_UA}\r\n`,
@@ -103,8 +104,16 @@ export function buildFfmpegArgs(url: string, seekSeconds: number): string[] {
       "-reconnect_on_http_error", "4xx,5xx",
     );
   }
-  if (seekSeconds > 0) args.push("-ss", String(seekSeconds));
+  // B站's CDN serves Range requests, so seek input-side: FFmpeg jumps straight
-  args.push("-i", url, "-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "-");
+  // to the byte offset. Output-side seek would download and decode everything
+  // before the target first — minutes for a resume deep into a 3-hour video
+  // (#161), long enough to trip the stall watchdog.
+  const inputSideSeek = isBilibili;
+  if (seekSeconds > 0 && inputSideSeek) args.push("-ss", String(seekSeconds));
+  args.push("-i", url);
+  // Output-side seek (after -i): works on CDNs that reject Range/keyframe seeks (NetEase music.126.net).
+  if (seekSeconds > 0 && !inputSideSeek) args.push("-ss", String(seekSeconds));
+  args.push("-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "-");
 
   return args;
 }

src/bot/instance.test.ts

@@ -1538,3 +1538,149 @@ describe("BotInstance live-queue persistence (#119)", () => {
     }
   });
 });
+
+describe("BotInstance Bilibili multi-P resolution", () => {
+  it("resolves multi-P search result to P1 with accurate duration and name", async () => {
+    const multiPSongDetail = {
+      id: "BV1multiP?p=1",
+      name: "测试视频 - P1 分P1",
+      artist: "UP主",
+      album: "",
+      duration: 100, // P1 duration
+      coverUrl: "",
+      platform: "bilibili" as const,
+    };
+    const mockBili = {
+      platform: "bilibili" as const,
+      search: vi.fn().mockResolvedValue({
+        songs: [{
+          id: "BV1multiP",
+          name: "测试视频",
+          artist: "UP主",
+          album: "",
+          duration: 300, // total duration in search
+          coverUrl: "",
+          platform: "bilibili",
+        }],
+        albums: [],
+        playlists: [],
+      }),
+      getSongDetail: vi.fn().mockResolvedValue(multiPSongDetail),
+      getSongUrl: vi.fn().mockResolvedValue({ url: "http://audio.test" }),
+    };
+
+    const ctx = {
+      config: { commandPrefix: "!" },
+      lastSearchResults: [] as any[],
+      getProvider: () => mockBili,
+      getProviderFor: () => mockBili,
+    };
+
+    const res = await (BotInstance.prototype as any).resolvePlayQuery.call(ctx, {
+      name: "play",
+      args: "测试视频",
+      rawArgs: ["测试视频"],
+      flags: new Set(),
+    });
+
+    expect(res.song).toBeDefined();
+    expect(res.song.id).toBe("BV1multiP?p=1");
+    expect(res.song.name).toBe("测试视频 - P1 分P1");
+    expect(res.song.duration).toBe(100);
+  });
+});
+
+
+describe("resumeInterruptedStream — long B站 streams dying mid-play (#161)", () => {
+  const resumeInterruptedStream = (BotInstance.prototype as any).resumeInterruptedStream as (
+    this: unknown,
+  ) => Promise<boolean>;
+
+  function makeCtx(opts: { platform?: string; elapsed?: number; duration?: number; url?: string | null } = {}) {
+    const song: any = {
+      id: "BV1abc", name: "Long", artist: "A", album: "", coverUrl: "",
+      platform: opts.platform ?? "bilibili", duration: opts.duration ?? 10_000, url: "old",
+    };
+    let elapsed = opts.elapsed ?? 1000;
+    let state: "idle" | "playing" = "idle";
+    const provider = {
+      getSongUrl: vi.fn(async () => (opts.url === null ? null : { url: opts.url ?? "https://fresh.test/a.m4s" })),
+    };
+    const ctx: any = {
+      song,
+      provider,
+      connected: true,
+      effectiveDuration: song.duration,
+      streamRecovery: null,
+      queue: { current: vi.fn(() => song) },
+      player: {
+        getElapsed: vi.fn(() => elapsed),
+        getState: vi.fn(() => state),
+        play: vi.fn(() => { state = "playing"; }),
+      },
+      getProviderFor: vi.fn(() => provider),
+      logger: { warn: vi.fn(), info: vi.fn() },
+      emit: vi.fn(),
+      setElapsed: (v: number) => { elapsed = v; state = "idle"; },
+    };
+    return ctx;
+  }
+
+  it("re-resolves the URL and resumes at the current position when a B站 stream ends early", async () => {
+    const ctx = makeCtx({ elapsed: 1000, duration: 10_000 });
+    expect(await resumeInterruptedStream.call(ctx)).toBe(true);
+    expect(ctx.provider.getSongUrl).toHaveBeenCalledWith("BV1abc");
+    expect(ctx.player.play).toHaveBeenCalledWith("https://fresh.test/a.m4s", 1000, 10_000);
+    expect(ctx.song.url).toBe("https://fresh.test/a.m4s");
+  });
+
+  it("does nothing near the real end of the track (normal EOF)", async () => {
+    const ctx = makeCtx({ elapsed: 9_990, duration: 10_000 });
+    expect(await resumeInterruptedStream.call(ctx)).toBe(false);
+    expect(ctx.provider.getSongUrl).not.toHaveBeenCalled();
+  });
+
+  it("does nothing for other platforms or an unknown duration", async () => {
+    expect(await resumeInterruptedStream.call(makeCtx({ platform: "netease" }))).toBe(false);
+    const unknown = makeCtx({ duration: 0 });
+    unknown.effectiveDuration = 0;
+    expect(await resumeInterruptedStream.call(unknown)).toBe(false);
+  });
+
+  it("gives up after 3 attempts that make no progress, then lets the queue advance", async () => {
+    const ctx = makeCtx({ elapsed: 1000 });
+    for (let i = 0; i < 3; i++) {
+      ctx.setElapsed(1000);
+      expect(await resumeInterruptedStream.call(ctx)).toBe(true);
+    }
+    ctx.setElapsed(1000);
+    expect(await resumeInterruptedStream.call(ctx)).toBe(false);
+    expect(ctx.player.play).toHaveBeenCalledTimes(3);
+  });
+
+  it("resets the attempt budget once a resume actually plays on for a while", async () => {
+    const ctx = makeCtx({ elapsed: 1000 });
+    for (let i = 0; i < 3; i++) {
+      ctx.setElapsed(1000);
+      await resumeInterruptedStream.call(ctx);
+    }
+    ctx.setElapsed(2000); // the last resume played ~16 more minutes
+    expect(await resumeInterruptedStream.call(ctx)).toBe(true);
+  });
+
+  it("falls through to advancing when no fresh URL can be fetched", async () => {
+    const ctx = makeCtx({ url: null });
+    expect(await resumeInterruptedStream.call(ctx)).toBe(false);
+    expect(ctx.player.play).not.toHaveBeenCalled();
+  });
+
+  it("does not clobber a different track the user started while the URL was resolving", async () => {
+    const ctx = makeCtx();
+    ctx.provider.getSongUrl.mockImplementation(async () => {
+      ctx.queue.current.mockReturnValue({ id: "other" }); // user ran !next meanwhile
+      return { url: "https://fresh.test/a.m4s" };
+    });
+    expect(await resumeInterruptedStream.call(ctx)).toBe(true); // handled: don't advance again
+    expect(ctx.player.play).not.toHaveBeenCalled();
+  });
+});

src/bot/instance.ts

@@ -193,6 +193,8 @@ export class BotInstance extends EventEmitter {
   private lastSearchResults: Song[] = [];
   /** 当前曲实际播放时长（试听片段秒数或完整 duration）；resolveAndPlay 赋值。 */
   private effectiveDuration: number | undefined;
+  /** Resume attempts for the current song's stream (#161); see resumeInterruptedStream. */
+  private streamRecovery: { song: QueuedSong; attempts: number; position: number } | null = null;
   private playGate: Promise<unknown> = Promise.resolve();
   /** Per-bot Jellyfin playback-report session (start / ~10s progress / stop).
    *  null when the wired provider has no reporting capability. */
@@ -322,10 +324,19 @@ export class BotInstance extends EventEmitter {
     });
 
     this.player.on("trackEnd", () => {
-      this.logger.debug("Track ended, advancing queue");
+      this.resumeInterruptedStream()
-      this.playNext().catch((err) => {
+        .catch((err) => {
-        this.logger.error({ err }, "playNext failed after trackEnd");
+          this.logger.warn({ err }, "Stream resume failed");
-      });
+          return false;
+        })
+        .then((resumed) => {
+          if (resumed) return;
+          this.logger.debug("Track ended, advancing queue");
+          return this.playNext();
+        })
+        .catch((err) => {
+          this.logger.error({ err }, "playNext failed after trackEnd");
+        });
     });
 
     this.player.on("error", (err: Error) => {
@@ -968,6 +979,14 @@ export class BotInstance extends EventEmitter {
     this.voteSkipUsers.clear();
     const provider = this.getProviderFor(song.platform);
     try {
+      if (song.platform === "bilibili" && (!song.id.includes("?p=") || song.duration === 0)) {
+        const detail = await provider.getSongDetail(song.id);
+        if (detail) {
+          song.duration = detail.duration;
+          song.name = detail.name;
+          song.id = detail.id;
+        }
+      }
       const result = await provider.getSongUrl(song.id);
       if (!result?.url) {
         this.logger.warn({ songId: song.id, name: song.name }, "No URL available, skipping");
@@ -1108,6 +1127,69 @@ export class BotInstance extends EventEmitter {
     }
   }
 
+  /** Platforms whose CDN stream can die mid-file on long content (#89, #161). */
+  private static readonly RESUMABLE_PLATFORMS: ReadonlySet<Platform> = new Set(["bilibili"]);
+  /** A track that ends within this many seconds of its duration ended normally. */
+  private static readonly STREAM_END_TOLERANCE_S = 30;
+  private static readonly MAX_STREAM_RESUMES = 3;
+
+  /**
+   * Called when the player reports a track end. If a B站 stream ended long
+   * before its known duration, the CDN dropped it (#161): fetch a fresh URL
+   * and continue from where it stopped instead of skipping the rest of a
+   * 2-3 hour video. Gives up after MAX_STREAM_RESUMES attempts that make no
+   * real progress, so a truly broken stream still advances the queue.
+   *
+   * Returns true when it handled the end (resumed, or a newer track has
+   * already taken over), false when the caller should advance the queue.
+   */
+  private async resumeInterruptedStream(): Promise<boolean> {
+    const song = this.queue.current();
+    if (!song || !this.connected || !BotInstance.RESUMABLE_PLATFORMS.has(song.platform)) {
+      return false;
+    }
+    const duration = this.effectiveDuration ?? song.duration;
+    const position = Math.floor(this.player.getElapsed());
+    if (!(duration > 0) || duration - position <= BotInstance.STREAM_END_TOLERANCE_S) {
+      return false;
+    }
+
+    const recovery = this.streamRecovery;
+    if (
+      !recovery ||
+      recovery.song !== song ||
+      position - recovery.position > BotInstance.STREAM_END_TOLERANCE_S
+    ) {
+      this.streamRecovery = { song, attempts: 0, position };
+    }
+    const state = this.streamRecovery!;
+    if (state.attempts >= BotInstance.MAX_STREAM_RESUMES) {
+      this.logger.warn(
+        { songId: song.id, position, duration, attempts: state.attempts },
+        "Stream keeps ending early — giving up and advancing",
+      );
+      this.streamRecovery = null;
+      return false;
+    }
+    state.attempts++;
+    state.position = position;
+
+    this.logger.warn(
+      { songId: song.id, position, duration, attempt: state.attempts },
+      "Stream ended before the track did — resuming with a fresh URL",
+    );
+    const result = await this.getProviderFor(song.platform).getSongUrl(song.id);
+    // The user may have skipped/stopped while we were resolving; never
+    // clobber whatever is playing now.
+    if (this.queue.current() !== song || this.player.getState() !== "idle") return true;
+    if (!result?.url || !this.connected) return false;
+
+    song.url = result.url;
+    this.player.play(result.url, position, duration);
+    this.emit("stateChange");
+    return true;
+  }
+
   private async syncProfileToSong(song: QueuedSong | null): Promise<void> {
     try {
       await this.profileManager.onSongChange(song);
@@ -1134,7 +1216,12 @@ export class BotInstance extends EventEmitter {
         return { error: `No recent search. Use ${p}search <name> first.` };
       if (sel > this.lastSearchResults.length)
         return { error: `Invalid selection #${sel}. ${p}search returned ${this.lastSearchResults.length} results.` };
-      return { song: this.lastSearchResults[sel - 1] };
+      let song = this.lastSearchResults[sel - 1];
+      if (song.platform === "bilibili") {
+        const detail = await this.getProviderFor("bilibili").getSongDetail(song.id);
+        if (detail) song = { ...detail, platform: "bilibili" };
+      }
+      return { song };
     }
 
     // 2) id/URL — fetch that exact song.
@@ -1151,7 +1238,12 @@ export class BotInstance extends EventEmitter {
     const provider = this.getProvider(cmd.flags);
     const result = await provider.search(args, 1);
     if (result.songs.length === 0) return { error: `No results found for: ${args}` };
-    return { song: { ...result.songs[0], platform: provider.platform } };
+    let song = result.songs[0];
+    if (provider.platform === "bilibili") {
+      const detail = await provider.getSongDetail(song.id);
+      if (detail) song = detail;
+    }
+    return { song: { ...song, platform: provider.platform } };
   }
 
   private async cmdSearch(cmd: ParsedCommand): Promise<string> {

src/music/bilibili.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from "vitest";
-import { BiliBiliProvider } from "./bilibili.js";
+import { BiliBiliProvider, pickStableAudioUrl } from "./bilibili.js";
 
 describe("BiliBiliProvider.search pagination", () => {
   function mockProvider() {
@@ -37,3 +37,169 @@ describe("BiliBiliProvider.search pagination", () => {
     expect(searchParams(get).page).toBe("1");
   });
 });
+
+describe("BiliBiliProvider multi-P support", () => {
+  it("parseBilibiliId extracts bvid and page correctly", async () => {
+    const { parseBilibiliId } = await import("./bilibili.js");
+    expect(parseBilibiliId("BV1yxHQeYEuE")).toEqual({ bvid: "BV1yxHQeYEuE", page: 1 });
+    expect(parseBilibiliId("BV1yxHQeYEuE?p=3")).toEqual({ bvid: "BV1yxHQeYEuE", page: 3 });
+    expect(parseBilibiliId("BV1yxHQeYEuE:p2")).toEqual({ bvid: "BV1yxHQeYEuE", page: 2 });
+    expect(parseBilibiliId("https://www.bilibili.com/video/BV1yxHQeYEuE?p=5")).toEqual({
+      bvid: "BV1yxHQeYEuE",
+      page: 5,
+    });
+    expect(parseBilibiliId("some-other-id")).toEqual({ bvid: "some-other-id", page: 1 });
+  });
+
+  function mockViewProvider(viewData: any, playUrlData?: any) {
+    const p = new BiliBiliProvider();
+    const get = vi.fn().mockImplementation((url: string, opts?: any) => {
+      if (url === "/x/web-interface/view") {
+        return Promise.resolve({ data: { data: viewData } });
+      }
+      if (url === "/x/player/playurl") {
+        return Promise.resolve({ data: { data: playUrlData ?? {} } });
+      }
+      return Promise.resolve({ data: {} });
+    });
+    (p as any).buvidInitialized = true;
+    (p as any).api = { get };
+    return { p, get };
+  }
+
+  const multiPViewData = {
+    bvid: "BV1multiP",
+    title: "测试多P教程",
+    pic: "http://i0.hdslb.com/bfs/archive/test.jpg",
+    duration: 300, // 总时长 300 秒 (120 + 180)
+    owner: { name: "UP主测试" },
+    pages: [
+      { cid: 10001, page: 1, part: "第一讲 入门", duration: 120 },
+      { cid: 10002, page: 2, part: "第二讲 进阶", duration: 180 },
+    ],
+  };
+
+  const singlePViewData = {
+    bvid: "BV1singleP",
+    title: "测试单P视频",
+    pic: "http://i0.hdslb.com/bfs/archive/single.jpg",
+    duration: 200,
+    owner: { name: "UP主测试" },
+    pages: [
+      { cid: 20001, page: 1, part: "测试单P视频", duration: 200 },
+    ],
+  };
+
+  it("getSongDetail for single-P video returns total duration and clean bvid", async () => {
+    const { p } = mockViewProvider(singlePViewData);
+    const song = await p.getSongDetail("BV1singleP");
+    expect(song).not.toBeNull();
+    expect(song!.id).toBe("BV1singleP");
+    expect(song!.name).toBe("测试单P视频");
+    expect(song!.duration).toBe(200);
+    expect(song!.platform).toBe("bilibili");
+  });
+
+  it("getSongDetail for multi-P video without ?p defaults to P1 with P1 duration", async () => {
+    const { p } = mockViewProvider(multiPViewData);
+    const song = await p.getSongDetail("BV1multiP");
+    expect(song).not.toBeNull();
+    expect(song!.id).toBe("BV1multiP?p=1");
+    expect(song!.name).toBe("测试多P教程 - P1 第一讲 入门");
+    expect(song!.duration).toBe(120); // P1 独立时长，而非总时长 300！
+    expect(song!.platform).toBe("bilibili");
+  });
+
+  it("getSongDetail for multi-P video with ?p=2 returns P2 with P2 duration", async () => {
+    const { p } = mockViewProvider(multiPViewData);
+    const song = await p.getSongDetail("BV1multiP?p=2");
+    expect(song).not.toBeNull();
+    expect(song!.id).toBe("BV1multiP?p=2");
+    expect(song!.name).toBe("测试多P教程 - P2 第二讲 进阶");
+    expect(song!.duration).toBe(180); // P2 独立时长
+    expect(song!.platform).toBe("bilibili");
+  });
+
+  it("getVideoParts returns all parts with duration and cid", async () => {
+    const { p } = mockViewProvider(multiPViewData);
+    const partsResult = await p.getVideoParts("BV1multiP");
+    expect(partsResult).not.toBeNull();
+    expect(partsResult!.bvid).toBe("BV1multiP");
+    expect(partsResult!.title).toBe("测试多P教程");
+    expect(partsResult!.parts).toHaveLength(2);
+    expect(partsResult!.parts[0]).toEqual({
+      part: 1,
+      cid: 10001,
+      title: "第一讲 入门",
+      duration: 120,
+    });
+    expect(partsResult!.parts[1]).toEqual({
+      part: 2,
+      cid: 10002,
+      title: "第二讲 进阶",
+      duration: 180,
+    });
+  });
+
+  it("getSongUrl requests playurl with correct cid for specific part", async () => {
+    const playUrlResponse = {
+      dash: {
+        audio: [
+          { bandwidth: 64000, baseUrl: "http://audio.64k.test" },
+          { bandwidth: 320000, baseUrl: "http://audio.320k.test" },
+        ],
+      },
+    };
+    const { p, get } = mockViewProvider(multiPViewData, playUrlResponse);
+
+    const result = await p.getSongUrl("BV1multiP?p=2");
+    expect(result).not.toBeNull();
+    expect(result!.url).toBe("http://audio.320k.test");
+
+    const playurlCall = get.mock.calls.find((c: any[]) => c[0] === "/x/player/playurl");
+    expect(playurlCall).toBeTruthy();
+    expect(playurlCall![1].params.cid).toBe(10002); // 准确传入 P2 的 cid
+    expect(playurlCall![1].params.bvid).toBe("BV1multiP"); // 纯净 bvid
+  });
+});
+
+describe("pickStableAudioUrl (#161 long streams dying mid-play)", () => {
+  const pcdn = "https://xy1x2x3x4xy.mcdn.bilivideo.cn:4483/upgcxcode/1/2/3/3-1-30280.m4s?e=x&deadline=1";
+  const szbdyd = "https://cn-hk-eq-01-01.szbdyd.com/upgcxcode/1/2/3/3-1-30280.m4s?deadline=1";
+  const upos = "https://upos-sz-mirrorcos.bilivideo.com/upgcxcode/1/2/3/3-1-30280.m4s?deadline=1";
+  const upos2 = "https://upos-sz-mirror08c.bilivideo.com/upgcxcode/1/2/3/3-1-30280.m4s?deadline=1";
+
+  it("prefers an upos/cos mirror over a PCDN baseUrl", () => {
+    expect(pickStableAudioUrl({ baseUrl: pcdn, backupUrl: [szbdyd, upos] })).toBe(upos);
+  });
+
+  it("keeps the baseUrl when it is already a stable host", () => {
+    expect(pickStableAudioUrl({ baseUrl: upos, backupUrl: [upos2] })).toBe(upos);
+  });
+
+  it("accepts the snake_case field names", () => {
+    expect(pickStableAudioUrl({ base_url: pcdn, backup_url: [upos2] })).toBe(upos2);
+  });
+
+  it("falls back to the baseUrl when every candidate is PCDN", () => {
+    expect(pickStableAudioUrl({ baseUrl: pcdn, backupUrl: [szbdyd] })).toBe(pcdn);
+  });
+
+  it("returns undefined when there is no url at all", () => {
+    expect(pickStableAudioUrl({})).toBeUndefined();
+  });
+
+  it("getSongUrl returns the stable mirror of the best stream", async () => {
+    const p = new BiliBiliProvider();
+    (p as any).cidCache.set("BV1abc", 42);
+    (p as any).api = {
+      get: vi.fn().mockResolvedValue({
+        data: { data: { dash: { audio: [
+          { bandwidth: 64000, baseUrl: "https://upos-sz-mirrorcos.bilivideo.com/low.m4s" },
+          { bandwidth: 320000, baseUrl: pcdn, backupUrl: [upos] },
+        ] } } },
+      }),
+    };
+    expect((await p.getSongUrl("BV1abc"))?.url).toBe(upos);
+  });
+});

src/music/bilibili.ts

@@ -27,6 +27,69 @@ const WBI_MIXIN_KEY_ENC_TAB = [
 
 const WBI_KEY_TTL_MS = 6 * 60 * 60 * 1000; // wbi keys rotate ~daily; refresh every 6h
 
+export interface BiliVideoPart {
+  part: number;
+  cid: number;
+  title: string;
+  duration: number;
+}
+
+export interface BiliVideoPartsResult {
+  bvid: string;
+  title: string;
+  coverUrl: string;
+  artist: string;
+  parts: BiliVideoPart[];
+}
+
+/**
+ * PCDN / P2P edge hosts (xy*.mcdn.bilivideo.cn:<port>, *.szbdyd.com). Their
+ * sessions get cut mid-file, which kills long streams partway (#89, #161),
+ * and a reconnect to the same host rarely recovers.
+ */
+const BILI_PCDN_HOST = /\.mcdn\.bilivideo\.cn$|\.szbdyd\.com$/i;
+
+/**
+ * Pick the audio URL least likely to die mid-stream: the first upos/cos
+ * mirror among baseUrl + backupUrl, else the baseUrl as before.
+ */
+export function pickStableAudioUrl(stream: {
+  baseUrl?: string;
+  base_url?: string;
+  backupUrl?: string[];
+  backup_url?: string[];
+}): string | undefined {
+  const primary = stream.baseUrl ?? stream.base_url;
+  const candidates = [primary, ...(stream.backupUrl ?? stream.backup_url ?? [])].filter(
+    (u): u is string => typeof u === "string" && u.length > 0,
+  );
+  const stable = candidates.find((u) => {
+    try {
+      return !BILI_PCDN_HOST.test(new URL(u).hostname);
+    } catch {
+      return false;
+    }
+  });
+  return stable ?? primary;
+}
+
+/**
+ * 解析带有分P信息的 B站 ID 或 URL。
+ * 支持形如 "BVxxxx", "BVxxxx?p=2", "BVxxxx:p2" 以及完整 URL 等格式，默认 page 为 1。
+ */
+export function parseBilibiliId(songId: string): { bvid: string; page: number } {
+  const str = (songId ?? "").trim();
+  const bvMatch = str.match(/BV[0-9A-Za-z]+/i);
+  if (!bvMatch) {
+    return { bvid: str, page: 1 };
+  }
+  const bvid = bvMatch[0];
+  const pageMatch = str.match(/[?&]p=(\d+)|:p?(\d+)/i);
+  const pageStr = pageMatch ? (pageMatch[1] ?? pageMatch[2]) : undefined;
+  const page = pageStr ? parseInt(pageStr, 10) : 1;
+  return { bvid, page: Math.max(1, page) };
+}
+
 export class BiliBiliProvider implements MusicProvider {
   readonly platform = "bilibili" as const;
   private api: AxiosInstance;
@@ -192,18 +255,41 @@ export class BiliBiliProvider implements MusicProvider {
   }
 
   async getSongDetail(songId: string): Promise<Song | null> {
+    const { bvid, page } = parseBilibiliId(songId);
     try {
       const res = await this.api.get("/x/web-interface/view", {
-        params: { bvid: songId },
+        params: { bvid },
         headers: this.cookieHeaders,
       });
 
       const data = res.data?.data;
       if (!data) return null;
 
-      // Cache cid for later audio URL fetching
+      const pages = data.pages ?? [];
-      if (data.pages?.[0]?.cid) {
+      // 缓存所有分P的 cid 映射
-        this.cidCache.set(songId, data.pages[0].cid);
+      for (const p of pages) {
+        this.cidCache.set(`${bvid}?p=${p.page}`, p.cid);
+      }
+      if (pages[0]?.cid) {
+        this.cidCache.set(bvid, pages[0].cid);
+      }
+
+      const targetPage = pages.find((p: any) => p.page === page) ?? pages[0];
+
+      // 若为多P视频，返回对应分P的名称与独立时长
+      if (pages.length > 1 && targetPage) {
+        const partTitle = targetPage.part && targetPage.part !== data.title
+          ? `${data.title} - P${targetPage.page} ${targetPage.part}`
+          : `${data.title} (P${targetPage.page})`;
+        return {
+          id: `${bvid}?p=${targetPage.page}`,
+          name: partTitle,
+          artist: data.owner?.name ?? "",
+          album: "",
+          duration: targetPage.duration ?? 0,
+          coverUrl: this.normalizeCover(data.pic ?? ""),
+          platform: "bilibili" as const,
+        };
       }
 
       return {
@@ -211,7 +297,7 @@ export class BiliBiliProvider implements MusicProvider {
         name: data.title ?? "",
         artist: data.owner?.name ?? "",
         album: "",
-        duration: data.duration ?? 0,
+        duration: targetPage?.duration ?? data.duration ?? 0,
         coverUrl: this.normalizeCover(data.pic ?? ""),
         platform: "bilibili" as const,
       };
@@ -220,9 +306,47 @@ export class BiliBiliProvider implements MusicProvider {
     }
   }
 
+  /** 获取视频所有分P列表 */
+  async getVideoParts(bvid: string): Promise<BiliVideoPartsResult | null> {
+    const { bvid: cleanBvid } = parseBilibiliId(bvid);
+    try {
+      const res = await this.api.get("/x/web-interface/view", {
+        params: { bvid: cleanBvid },
+        headers: this.cookieHeaders,
+      });
+
+      const data = res.data?.data;
+      if (!data) return null;
+
+      const pages = data.pages ?? [];
+      for (const p of pages) {
+        this.cidCache.set(`${cleanBvid}?p=${p.page}`, p.cid);
+      }
+      if (pages[0]?.cid) {
+        this.cidCache.set(cleanBvid, pages[0].cid);
+      }
+
+      return {
+        bvid: cleanBvid,
+        title: data.title ?? "",
+        coverUrl: this.normalizeCover(data.pic ?? ""),
+        artist: data.owner?.name ?? "",
+        parts: pages.map((p: any) => ({
+          part: p.page,
+          cid: p.cid,
+          title: p.part ?? `P${p.page}`,
+          duration: p.duration ?? 0,
+        })),
+      };
+    } catch {
+      return null;
+    }
+  }
+
   /** Get CID for a bvid, using cache when available */
-  private async getCid(bvid: string): Promise<number | null> {
+  private async getCid(bvid: string, page = 1): Promise<number | null> {
-    const cached = this.cidCache.get(bvid);
+    const key = page > 1 ? `${bvid}?p=${page}` : bvid;
+    const cached = this.cidCache.get(key) ?? (page === 1 ? this.cidCache.get(`${bvid}?p=1`) : undefined);
     if (cached) return cached;
 
     // Limit cache size to prevent unbounded growth
@@ -231,20 +355,22 @@ export class BiliBiliProvider implements MusicProvider {
       if (firstKey) this.cidCache.delete(firstKey);
     }
 
-    const detail = await this.getSongDetail(bvid);
+    const songId = page > 1 ? `${bvid}?p=${page}` : bvid;
+    const detail = await this.getSongDetail(songId);
     if (!detail) return null;
-    return this.cidCache.get(bvid) ?? null;
+    return this.cidCache.get(key) ?? this.cidCache.get(`${bvid}?p=${page}`) ?? this.cidCache.get(bvid) ?? null;
   }
 
   async getSongUrl(songId: string, _quality?: string): Promise<SongUrlResult | null> {
-    const cid = await this.getCid(songId);
+    const { bvid, page } = parseBilibiliId(songId);
+    const cid = await this.getCid(bvid, page);
     if (!cid) return null;
 
     try {
       const res = await this.api.get("/x/player/playurl", {
         params: {
           cid,
-          bvid: songId,
+          bvid,
           fnval: 16, // DASH format
         },
         headers: this.cookieHeaders,
@@ -258,7 +384,7 @@ export class BiliBiliProvider implements MusicProvider {
         (b.bandwidth ?? 0) > (a.bandwidth ?? 0) ? b : a
       );
 
-      const biliUrl = best.baseUrl ?? best.base_url;
+      const biliUrl = pickStableAudioUrl(best);
       return biliUrl ? { url: biliUrl } : null;
     } catch {
       return null;

src/web/api/music.test.ts

@@ -438,3 +438,68 @@ describe("music router POST /local/upload — content types and size cap (#149)"
     expect(uploadAudio).not.toHaveBeenCalled();
   });
 });
+
+describe("music router GET /bilibili/parts", () => {
+  it("returns 400 when bvid is missing", async () => {
+    const router = createMusicRouter(
+      fakeProvider("netease"),
+      fakeProvider("qq"),
+      fakeProvider("bilibili"),
+      pino({ level: "silent" })
+    );
+    const app = express();
+    app.use("/api/music", router);
+
+    const res = await request(app).get("/api/music/bilibili/parts");
+    expect(res.status).toBe(400);
+    expect(res.body.error).toBe("bvid is required");
+  });
+
+  it("returns parts from bilibili provider when available", async () => {
+    const mockBilibili = {
+      platform: "bilibili" as const,
+      search: vi.fn(),
+      getVideoParts: vi.fn().mockResolvedValue({
+        bvid: "BV1test",
+        title: "多P视频测试",
+        parts: [
+          { part: 1, cid: 101, title: "P1", duration: 100 },
+          { part: 2, cid: 102, title: "P2", duration: 200 },
+        ],
+      }),
+    };
+    const router = createMusicRouter(
+      fakeProvider("netease"),
+      fakeProvider("qq"),
+      mockBilibili as unknown as MusicProvider,
+      pino({ level: "silent" })
+    );
+    const app = express();
+    app.use("/api/music", router);
+
+    const res = await request(app).get("/api/music/bilibili/parts?bvid=BV1test");
+    expect(res.status).toBe(200);
+    expect(res.body.bvid).toBe("BV1test");
+    expect(res.body.parts).toHaveLength(2);
+    expect(mockBilibili.getVideoParts).toHaveBeenCalledWith("BV1test");
+  });
+
+  it("returns 404 when getVideoParts returns null", async () => {
+    const mockBilibili = {
+      platform: "bilibili" as const,
+      search: vi.fn(),
+      getVideoParts: vi.fn().mockResolvedValue(null),
+    };
+    const router = createMusicRouter(
+      fakeProvider("netease"),
+      fakeProvider("qq"),
+      mockBilibili as unknown as MusicProvider,
+      pino({ level: "silent" })
+    );
+    const app = express();
+    app.use("/api/music", router);
+
+    const res = await request(app).get("/api/music/bilibili/parts?bvid=BV1notfound");
+    expect(res.status).toBe(404);
+  });
+});

src/web/api/music.ts

@@ -382,6 +382,31 @@ export function createMusicRouter(
     }
   });
 
+  // B站分P列表查询
+  router.get("/bilibili/parts", async (req, res) => {
+    try {
+      const bvid = (req.query.bvid as string)?.trim();
+      if (!bvid) {
+        res.status(400).json({ error: "bvid is required" });
+        return;
+      }
+      const provider = bilibiliProvider as any;
+      if (typeof provider.getVideoParts === "function") {
+        const result = await provider.getVideoParts(bvid);
+        if (!result) {
+          res.status(404).json({ error: "Video not found" });
+          return;
+        }
+        res.json(result);
+      } else {
+        res.status(501).json({ error: "Not supported" });
+      }
+    } catch (err) {
+      logger.error({ err }, "Get bilibili parts failed");
+      res.status(500).json({ error: (err as Error).message });
+    }
+  });
+
   // Enabled sources + default platform, for the web UI (source tabs, default
   // search/playback source). Without a config (unit-test routers) everything
   // reports enabled with the legacy netease default.

web/src/App.vue

@@ -7,6 +7,7 @@
     <Player />
     <Toast />
     <Queue class="mobile-queue" :open="mobileQueueOpen" @close="mobileQueueOpen = false" />
+    <BilibiliPartModal />
 
     <!-- Mobile mini player -->
     <div v-if="currentSong" class="m-player" @click="onPlayerRowClick">
@@ -102,6 +103,7 @@ import Player from './components/Player.vue';
 import CoverArt from './components/CoverArt.vue';
 import Toast from './components/Toast.vue';
 import Queue from './components/Queue.vue';
+import BilibiliPartModal from './components/BilibiliPartModal.vue';
 
 const playerStore = usePlayerStore();
 const session = useSession();

web/src/components/BilibiliPartModal.vue

@@ -0,0 +1,293 @@
+<template>
+  <div v-if="modal.open" class="edit-modal-overlay" @click.self="store.closeBilibiliPartModal">
+    <div class="edit-modal">
+      <h3 class="modal-title">选择分P</h3>
+
+      <div class="form-group">
+        <label>视频名称</label>
+        <div class="video-info-box">
+          <CoverArt :url="modal.coverUrl" :size="44" :radius="8" />
+          <div class="video-meta">
+            <div class="video-title" :title="modal.title">{{ modal.title }}</div>
+            <div class="video-hint">共 {{ modal.parts.length }} 个分P · {{ actionHint }}</div>
+          </div>
+        </div>
+      </div>
+
+      <div class="form-group">
+        <label>分P列表</label>
+        <div class="parts-list">
+          <div
+            v-for="part in modal.parts"
+            :key="part.part"
+            class="part-item"
+            :class="{ active: selectedPart?.part === part.part }"
+            @click="selectedPart = part"
+            @dblclick="confirmSelect(part)"
+          >
+            <span class="part-badge">P{{ part.part }}</span>
+            <span class="part-name" :title="part.title">{{ part.title }}</span>
+            <span class="part-duration">{{ formatDuration(part.duration) }}</span>
+          </div>
+        </div>
+      </div>
+
+      <div class="modal-actions">
+        <button class="btn-secondary" @click="store.closeBilibiliPartModal">取消</button>
+        <button
+          class="btn-primary"
+          :disabled="!selectedPart"
+          @click="selectedPart && confirmSelect(selectedPart)"
+        >
+          {{ confirmBtnText }}
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, watch } from 'vue';
+import { usePlayerStore, type BiliPart } from '../stores/player.js';
+import CoverArt from './CoverArt.vue';
+
+const store = usePlayerStore();
+const modal = computed(() => store.biliPartModal);
+
+const selectedPart = ref<BiliPart | null>(null);
+
+// 弹窗打开时默认选中第 1 P
+watch(
+  () => modal.value.open,
+  (open) => {
+    if (open && modal.value.parts.length > 0) {
+      selectedPart.value = modal.value.parts[0];
+    } else {
+      selectedPart.value = null;
+    }
+  },
+  { immediate: true },
+);
+
+const actionHint = computed(() => {
+  if (modal.value.action === 'playNext') return '添加到下一首播放';
+  if (modal.value.action === 'add') return '添加到播放队列';
+  return '立即播放';
+});
+
+const confirmBtnText = computed(() => {
+  if (modal.value.action === 'playNext') return '下一首播放';
+  if (modal.value.action === 'add') return '添加到队列';
+  return '播放';
+});
+
+function confirmSelect(part: BiliPart) {
+  store.selectBilibiliPart(part);
+}
+
+function formatDuration(seconds: number): string {
+  if (!seconds || seconds <= 0) return '--:--';
+  const m = Math.floor(seconds / 60);
+  const s = seconds % 60;
+  return `${m}:${s.toString().padStart(2, '0')}`;
+}
+</script>
+
+<style lang="scss" scoped>
+.edit-modal-overlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.5);
+  z-index: 200;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.edit-modal {
+  background: var(--bg-secondary);
+  border-radius: var(--radius-lg);
+  padding: 28px;
+  width: 480px;
+  max-width: 90vw;
+  max-height: 80vh;
+  display: flex;
+  flex-direction: column;
+}
+
+.modal-title {
+  font-size: 20px;
+  font-weight: 700;
+  margin-bottom: 20px;
+  color: var(--text-primary);
+}
+
+.form-group {
+  margin-bottom: 16px;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+
+  label {
+    display: block;
+    font-size: 13px;
+    font-weight: 600;
+    margin-bottom: 6px;
+    opacity: 0.7;
+    color: var(--text-primary);
+  }
+}
+
+.video-info-box {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 10px 14px;
+  background: var(--hover-bg);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-sm);
+
+  .video-meta {
+    flex: 1;
+    min-width: 0;
+  }
+
+  .video-title {
+    font-size: 13px;
+    font-weight: 600;
+    color: var(--text-primary);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    margin-bottom: 2px;
+  }
+
+  .video-hint {
+    font-size: 12px;
+    color: var(--text-secondary);
+  }
+}
+
+.parts-list {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  max-height: 280px;
+  overflow-y: auto;
+  padding-right: 4px;
+
+  &::-webkit-scrollbar {
+    width: 6px;
+  }
+  &::-webkit-scrollbar-thumb {
+    background: var(--border-color);
+    border-radius: var(--radius-sm);
+  }
+}
+
+.part-item {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 10px 14px;
+  background: var(--hover-bg);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+
+  &:hover {
+    border-color: var(--color-primary);
+    background: var(--color-primary-10, rgba(0, 161, 214, 0.08));
+  }
+
+  &.active {
+    border-color: var(--color-primary);
+    background: var(--color-primary-15, rgba(0, 161, 214, 0.15));
+
+    .part-badge {
+      background: var(--color-primary);
+      color: white;
+    }
+
+    .part-name {
+      color: var(--color-primary);
+      font-weight: 600;
+    }
+  }
+
+  .part-badge {
+    font-size: 11px;
+    font-weight: 700;
+    padding: 2px 6px;
+    border-radius: var(--radius-xs);
+    background: var(--color-primary-10, rgba(0, 161, 214, 0.1));
+    color: var(--color-primary);
+    flex-shrink: 0;
+    transition: all var(--transition-fast);
+  }
+
+  .part-name {
+    flex: 1;
+    font-size: 13px;
+    color: var(--text-primary);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+
+  .part-duration {
+    font-size: 12px;
+    color: var(--text-secondary);
+    font-variant-numeric: tabular-nums;
+    flex-shrink: 0;
+  }
+}
+
+.modal-actions {
+  display: flex;
+  gap: 10px;
+  justify-content: flex-end;
+  margin-top: 10px;
+}
+
+.btn-primary {
+  padding: 10px 20px;
+  background: var(--color-primary);
+  color: white;
+  border-radius: var(--radius-sm);
+  font-size: 13px;
+  font-weight: 600;
+  white-space: nowrap;
+  border: none;
+  cursor: pointer;
+  transition: transform var(--transition-fast);
+
+  &:hover:not(:disabled) {
+    transform: scale(1.02);
+  }
+  &:active:not(:disabled) {
+    transform: scale(0.98);
+  }
+  &:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+}
+
+.btn-secondary {
+  padding: 10px 20px;
+  background: var(--hover-bg);
+  border-radius: var(--radius-sm);
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+  border: none;
+  cursor: pointer;
+  transition: opacity var(--transition-fast);
+
+  &:hover {
+    opacity: 0.8;
+  }
+}
+</style>

web/src/stores/player.ts

@@ -17,6 +17,24 @@ export interface Song {
 
 export type Source = 'jellyfin' | 'netease' | 'qq' | 'kugou' | 'spotify';
 
+export interface BiliPart {
+  part: number;
+  cid: number;
+  title: string;
+  duration: number;
+}
+
+export interface BiliPartModalState {
+  open: boolean;
+  song: Song | null;
+  action: 'play' | 'playNext' | 'add';
+  bvid: string;
+  title: string;
+  coverUrl: string;
+  artist: string;
+  parts: BiliPart[];
+}
+
 export interface AlbumItem {
   id: string;
   name: string;
@@ -138,6 +156,18 @@ export const usePlayerStore = defineStore('player', {
     // Transient notification for surfacing failures (e.g., "song not playable")
     // to a global Toast. Bumped `id` triggers re-render of the same message.
     notification: null as { id: number; message: string; type: 'error' | 'info' } | null,
+
+    // Bilibili 多P分P选择弹窗状态
+    biliPartModal: {
+      open: false,
+      song: null,
+      action: 'play',
+      bvid: '',
+      title: '',
+      coverUrl: '',
+      artist: '',
+      parts: [] as BiliPart[],
+    } as BiliPartModalState,
   }),
 
   getters: {
@@ -411,8 +441,74 @@ export const usePlayerStore = defineStore('player', {
       this.notification = { id: Date.now(), message, type };
     },
 
-    async playSong(song: Song) {
+    /**
+     * 检查 B站视频是否为多P，若为多P则弹窗询问，单P则直接修正时长并继续
+     */
+    async checkBilibiliMultiPart(song: Song, action: 'play' | 'playNext' | 'add'): Promise<boolean> {
+      try {
+        const cleanBvid = song.id.split('?')[0].split(':')[0];
+        const res = await axios.get('/api/music/bilibili/parts', { params: { bvid: cleanBvid } });
+        const parts: BiliPart[] = res.data?.parts ?? [];
+        if (parts.length > 1) {
+          this.biliPartModal = {
+            open: true,
+            song,
+            action,
+            bvid: cleanBvid,
+            title: res.data.title || song.name,
+            coverUrl: res.data.coverUrl || song.coverUrl,
+            artist: res.data.artist || song.artist,
+            parts,
+          };
+          return true; // 弹窗接管
+        }
+        if (parts.length === 1) {
+          song.duration = parts[0].duration;
+        }
+      } catch {
+        // 网络请求异常则降级为正常播放
+      }
+      return false;
+    },
+
+    selectBilibiliPart(part: BiliPart) {
+      if (!this.biliPartModal.open || !this.biliPartModal.song) return;
+      const { song, action, bvid, title, artist, coverUrl } = this.biliPartModal;
+      this.biliPartModal.open = false;
+
+      const partTitle = part.title && part.title !== title
+        ? `${title} - P${part.part} ${part.title}`
+        : `${title} (P${part.part})`;
+
+      const partSong: Song = {
+        ...song,
+        id: `${bvid}?p=${part.part}`,
+        name: partTitle,
+        artist: artist || song.artist,
+        coverUrl: coverUrl || song.coverUrl,
+        duration: part.duration,
+      };
+
+      if (action === 'play') {
+        this.playSong(partSong, true);
+      } else if (action === 'playNext') {
+        this.playNextSong(partSong, true);
+      } else if (action === 'add') {
+        this.addSong(partSong, true);
+      }
+    },
+
+    closeBilibiliPartModal() {
+      this.biliPartModal.open = false;
+      this.biliPartModal.song = null;
+    },
+
+    async playSong(song: Song, skipPartCheck = false) {
       if (!this.activeBotId) return;
+      if (!skipPartCheck && song.platform === 'bilibili' && !song.id.includes('?p=')) {
+        const handled = await this.checkBilibiliMultiPart(song, 'play');
+        if (handled) return;
+      }
       // Guests use the non-destructive "play now" (insert-next + skip) so they
       // can't wipe everyone else's queue; members/admins keep the normal behavior.
       const endpoint = useSession().isGuest.value ? 'play-now-song' : 'play-song';
@@ -424,8 +520,12 @@ export const usePlayerStore = defineStore('player', {
       this._syncAfterAction();
     },
 
-    async playNextSong(song: Song) {
+    async playNextSong(song: Song, skipPartCheck = false) {
       if (!this.activeBotId) return;
+      if (!skipPartCheck && song.platform === 'bilibili' && !song.id.includes('?p=')) {
+        const handled = await this.checkBilibiliMultiPart(song, 'playNext');
+        if (handled) return;
+      }
       const res = await axios.post(`/api/player/${this.activeBotId}/play-next-song`, { song });
       if (res.data?.message) {
         this.notify(res.data.message, res.data.ok === false ? 'error' : 'info');
@@ -444,8 +544,12 @@ export const usePlayerStore = defineStore('player', {
       await axios.post(`/api/player/${this.activeBotId}/add-by-id`, { songId, platform });
     },
 
-    async addSong(song: Song) {
+    async addSong(song: Song, skipPartCheck = false) {
       if (!this.activeBotId) return;
+      if (!skipPartCheck && song.platform === 'bilibili' && !song.id.includes('?p=')) {
+        const handled = await this.checkBilibiliMultiPart(song, 'add');
+        if (handled) return;
+      }
       await axios.post(`/api/player/${this.activeBotId}/add-song`, { song });
     },