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视频保存为可用的最高分辨率。当创作者以 2160p 或 4320p 上传视频时，你可以直接在浏览器中选择对应画质并下载文件——无需安装、无需注册，我们也不会添加任何水印。",{"type":408,"tag":416,"props":417,"children":419},"h2",{"id":418},"什么时候-4k-才真的值得下载",[420],{"type":413,"value":421},"什么时候 4K 才真的值得下载",{"type":408,"tag":409,"props":423,"children":424},{},[425],{"type":413,"value":426},"当源视频本身锐利、播放设备较大且你也有充足存储时，4K 才是合适的选择。一段用智能手机拍摄的 vlog 即便下载 4K，画质也不会比 1080p 明显更好，因为源本身就受限。但如果是用专业相机拍摄的电影短片、音乐视频或科技评测，4K 在 4K 电视或显示器上确实能看出差别。",{"type":408,"tag":409,"props":428,"children":429},{},[430],{"type":413,"value":431},"简单测试：打开 YouTube 视频，点击齿轮图标，查看清晰度菜单。如果列表里有 2160p，说明源支持 4K，Any4K 可以保存；如果最高只有 1080p HD，下载所谓\"4K\"也毫无意义——底层像素根本不存在。",{"type":408,"tag":416,"props":433,"children":435},{"id":434},"_4k-管线是如何工作的",[436],{"type":413,"value":437},"4K 管线是如何工作的",{"type":408,"tag":409,"props":439,"children":440},{},[441],{"type":413,"value":442},"YouTube 通过 VP9、AV1 等格式的视频流以及 Opus、AAC 等音频流来分别提供 4K 内容。浏览器端的下载器需要同时拉取两路流，再合并为可播放的 MP4 或 MKV。Any4K 会自动完成混流，让你拿到一个直接能播的文件。",{"type":408,"tag":409,"props":444,"children":445},{},[446],{"type":413,"value":447},"如果你在别处看到\"video-only\"的 2160p，那就是未合并的视频流。Any4K 默认提供合并后的结果。",{"type":408,"tag":416,"props":449,"children":451},{"id":450},"_4k-vs-1440p-vs-1080p如何选择",[452],{"type":413,"value":453},"4K vs 1440p vs 1080p——如何选择",{"type":408,"tag":455,"props":456,"children":457},"ul",{},[458,470,480],{"type":408,"tag":459,"props":460,"children":461},"li",{},[462,468],{"type":408,"tag":463,"props":464,"children":465},"strong",{},[466],{"type":413,"value":467},"2160p（4K UHD）",{"type":413,"value":469},"——最适合 4K 电视和外接显示器。10 分钟的视频文件大小可能在 1-5 GB。需要存档质量时选这个。",{"type":408,"tag":459,"props":471,"children":472},{},[473,478],{"type":408,"tag":463,"props":474,"children":475},{},[476],{"type":413,"value":477},"1440p（2K QHD）",{"type":413,"value":479},"——笔记本和高 PPI 手机屏幕的甜点位。文件大小大约是 4K 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下编码效率不是最高，但每个设备和剪辑软件都能播放。",{"type":408,"tag":459,"props":520,"children":521},{},[522,527],{"type":408,"tag":463,"props":523,"children":524},{},[525],{"type":413,"value":526},"WebM（VP9）",{"type":413,"value":528},"——Google 默认的高效率格式。同等画质下文件更小。Chrome、Firefox、新版 Android 可播放；旧版 iOS 和很多剪辑软件原生不支持。",{"type":408,"tag":459,"props":530,"children":531},{},[532,537],{"type":408,"tag":463,"props":533,"children":534},{},[535],{"type":413,"value":536},"MKV（AV1）",{"type":413,"value":538},"——最新且最高效的编码。在同等画质下比 VP9 小约 30%。除了 VLC 和较新的操作系统外，播放器支持较为有限。",{"type":408,"tag":409,"props":540,"children":541},{},[542],{"type":413,"value":543},"如果你打算剪辑视频，稳妥起见选 MP4 H.264。如果只是要观看且在乎磁盘空间，WebM 或 AV1 都没问题。",{"type":408,"tag":416,"props":545,"children":547},{"id":546},"合理使用",[548],{"type":413,"value":546},{"type":408,"tag":409,"props":550,"children":551},{},[552],{"type":413,"value":553},"只在你有权保留的内容上使用 4K 下载——你自己的上传、公有领域内容、采用知识共享许可的作品，或创作者明确允许下载的视频。请尊重 YouTube 的服务条款、版权法以及创作者权益。",{"title":349,"searchDepth":555,"depth":555,"links":556},2,[557,558,559,560,561],{"id":418,"depth":555,"text":421},{"id":434,"depth":555,"text":437},{"id":450,"depth":555,"text":453},{"id":497,"depth":555,"text":500},{"id":546,"depth":555,"text":546},"markdown","content:zh:4k-youtube-downloader.md","content","zh/4k-youtube-downloader.md","zh/4k-youtube-downloader","md",[5,9,40,73,104,143,176,209,241,277,315],null,1793415034952]