🎼 MP4 转 WAVMP4 to WAV Converter
从 MP4（或 M4A、MOV 等）中提取音轨并解码为无压缩 WAV，可选采样率、位深、声道并截取片段；更改设置后旧结果会自动清除。本地处理。Extract the audio track from an MP4 (or M4A, MOV, etc.) and decode it to uncompressed WAV, with sample rate, bit depth, channels and optional trimming; changing a setting clears the old result. Processed locally.
使用说明与常见问题How-to & FAQ
「MP4 转 WAV」是什么？What is the MP4 to WAV Converter tool?
从 MP4（或 M4A、MOV 等）中提取音轨并解码为无压缩 WAV，可选采样率、位深、声道并截取片段；更改设置后旧结果会自动清除。本地处理。Extract the audio track from an MP4 (or M4A, MOV, etc.) and decode it to uncompressed WAV, with sample rate, bit depth, channels and optional trimming; changing a setting clears the old result. Processed locally.
如何使用「MP4 转 WAV」？How do I use the MP4 to WAV Converter tool?
在「MP4 转 WAV」中，选择或拖入文件，按需设置「采样率」、「位深」、「声道」、「开始（秒或 分:秒）」、「结束」等选项，然后点击「转换为 WAV」按钮即可。In the MP4 to WAV Converter: Choose or drop your files, set "Sample rate", "Bit depth", "Channels", "Start (s or m:ss)", "End", then click "Convert to WAV".
会上传吗？Is the file uploaded?
不会。文件只在浏览器本地解码和转换。No. The file is decoded and converted locally in your browser.
更改设置后需要重新转换吗？Do I need to convert again after changing a setting?
需要。改动采样率、位深、声道或开始 / 结束时间后，旧的结果和下载链接会立即清除，再点“转换为 WAV”即可按新设置生成。Yes. As soon as you change the sample rate, bit depth, channels or start / end time, the old result and download link are cleared; press Convert to WAV to make a new one with the new settings.
为什么提示没有音轨？Why does it say there is no audio track?
有些 MP4 只含视频画面（例如录屏或已静音的视频），没有声音可以提取。Some MP4 files contain only video (for example screen recordings or muted clips), so there is no sound to extract.
有哪些选项可以调整？What options can I adjust?
「MP4 转 WAV」的设置：「采样率」可选 保持原采样率、48 kHz、44.1 kHz、22.05 kHz、16 kHz（语音识别）、8 kHz（电话）（默认 保持原采样率）；「位深」可选 16 位 PCM（最通用）、24 位 PCM、32 位浮点（默认 16 位 PCM（最通用））；「声道」可选 保持声道、单声道（默认 保持声道）；「开始（秒或 分:秒）」可留空；「结束」可留空；可选文件：MP3、M4A、M4B、AAC、MP4、OGG、OGA、OPUS、FLAC、WAV。每次生成结果都按当前设置处理。Settings in the MP4 to WAV Converter — "Sample rate": Keep original, 48 kHz, 44.1 kHz, 22.05 kHz, 16 kHz (speech recognition), 8 kHz (telephone) (default Keep original); "Bit depth": 16-bit PCM (most compatible), 24-bit PCM, 32-bit float (default 16-bit PCM (most compatible)); "Channels": Keep channels, Mono (default Keep channels); "Start (s or m:ss)" optional; "End" optional; files: MP3, M4A, M4B, AAC, MP4, OGG, OGA, OPUS, FLAC, WAV. The result always uses the current settings.
「MP4 转 WAV」免费吗？需要注册吗？Is the MP4 to WAV Converter free? Do I need an account?
「MP4 转 WAV」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The MP4 to WAV Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.