Direct use of window.electron.ipcRenderer.send bypasses the abstraction layer. This should use the sendMprisVolume helper function defined in PlayerIpc.ts (line 295-297) for consistency with the rest of the codebase and proper error handling.

The setTimeout delay for sendMprisPlayState is hardcoded to 50ms, which is a magic number without explanation. This arbitrary delay suggests a race condition or timing issue that should be properly addressed rather than worked around with a fixed delay. Consider using proper synchronization or documenting why this delay is necessary.

When the user clicks "quit app" via the tray menu, the app immediately calls app.quit() without waiting for MPV cleanup. This is inconsistent with the before-quit handler which attempts async cleanup. This could result in the MPV process being left running as an orphan process. Consider using a consistent quit flow that ensures cleanup in both cases.

In the MPV engine path, playLoading is set to false on line 292 immediately after calling mpv.play(), but this is premature. The play operation is async and may fail, yet playLoading is cleared before awaiting the result or handling errors. This will show the UI as not loading even if the play operation fails, creating a confusing user experience.

The play method doesn't validate the URL format before passing it to MPV. MPV expects properly formatted URLs (http://, file://, etc.), but the validation is missing. Invalid URLs could cause MPV to fail in unexpected ways or expose the system to potential command injection if URL parsing is not properly handled by MPV.

When checking if MPV is installed, the function uses different commands (where vs which) but doesn't handle the case where the command might be installed in a non-standard location not in PATH. Additionally, there's no validation of the MPV version, which could lead to compatibility issues if an outdated MPV version is installed.

The MpvService maintains state (currentAudioDevice, playNonce, pendingFileLoaded, etc.) but doesn't properly handle cleanup when switching between MPV and other engines. If a user switches from MPV to web-audio engine while a play request is pending, the pendingFileLoaded promise may never resolve or reject, leading to memory leaks and hanging promises.

The title parameter is passed directly to MPV via the command line argument --force-media-title without sanitization. If the title contains special characters like quotes, backticks, or shell metacharacters, this could lead to command injection vulnerabilities. The title should be properly escaped or validated before being used in command arguments.

The error message "MPV 引擎不支持均衡器功能" is only in Chinese, but the codebase has messages in other languages. For consistency and internationalization, this message should use the i18n system if available, or at least have an English alternative for non-Chinese users.

The before-quit event handler prevents default quit behavior and uses event.preventDefault(), but the async cleanup logic doesn't properly allow the app to quit after cleanup completes. The app.exit(0) call inside the async callback will always execute asynchronously, potentially causing the quit to be delayed or fail. Consider removing preventDefault() and ensuring cleanup happens synchronously, or use a proper quit flow that doesn't prevent the event.

为了在 getAudioDevices 中使用异步的 exec，请在这里导入它以替代 execSync。

在主进程中使用 execSync 会阻塞事件循环，可能导致应用无响应，尤其是在 mpv 命令执行较慢时。建议改用异步的 exec 方法，并让 getAudioDevices 返回一个 Promise。调用方 ipc-mpv.ts 中的 ipcMain.handle 已经支持异步处理器，可以无缝对接。

此注释可能引起误解。对于所有引擎，audioManager 都是权威的数据源。statusStore 只是一个UI状态缓存。这里的逻辑实际上是使用 statusStore 作为 audioManager 在歌曲切换期间可能返回0时的后备值。建议修改注释以更准确地反映这一点，并对 getSeek 中的类似注释也进行修改。