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下载结果里也找不到 HEVC、AV1、VP9 或任何更新的编码——Instagram 会在分发前把一切都转码为 H.264。",{"type":406,"tag":407,"props":612,"children":613},{},[614],{"type":411,"value":615},"分辨率上限实际上就是 1080p。Reels、信息流视频以及类 IGTV 的长视频，横屏最高 1920x1080，竖屏 9:16 Reels 最高 1080x1920，正方形帖子 1080x1080，信息流偏好的 4:5 竖图最高 1080x1350。偶尔你会遇到更低的档位（720p、长边 640px），那是 Instagram 判断源不值得走高比特率梯度，但你不会看到更高的档位。Instagram 没有 4K 输出，也没有 HDR 输出。即使创作者上传的是 4K HDR 母版，Instagram 也会在帖子发布之前完成 SDR 色调映射并降采样；高分辨率原片无法从公开 CDN 取回。",{"type":406,"tag":407,"props":617,"children":618},{},[619],{"type":411,"value":620},"音频通常以约 128 kbps AAC 编码，根据源决定是单声道还是立体声。这个码率足以保证语音清晰、音乐播放尚可，但远低于一个以音乐为核心的平台会提供的水准。如果你下载 Reel 主要是为了音频，请预期它就是 App 里听到的那个保真度——下面没有更高质量的流隐藏着。",{"type":406,"tag":407,"props":622,"children":623},{},[624],{"type":411,"value":625},"还有一个常常让人意外的画质点：Instagram 上的 1080p 看起来比 YouTube 上的 1080p 更软。两者标称分辨率相同，但 Instagram 在分发前的压缩力度更大。YouTube 会为每档分辨率预留比特率预算，并给长视频留呼吸空间；Instagram 则因为预期是小屏移动观看、常常静音，会用更紧的编码器挤压每个视频。像素数完全一样，但每像素的画质并不一样。这是平台属性，不是下载器的问题。",{"type":406,"tag":414,"props":627,"children":629},{"id":628},"轮播帖如何挑选某一项",[630],{"type":411,"value":631},"轮播帖：如何挑选某一项",{"type":406,"tag":407,"props":633,"children":634},{},[635,637,642],{"type":411,"value":636},"轮播帖（可以左右滑的相册）最多可以放十个条目，照片和视频可以自由混合。一个轮播可能是「图、图、视频、图、视频」，而分享链接指向的是整个轮播，而不是其中某一项。URL 形态和单帖完全一样：",{"type":406,"tag":469,"props":638,"children":640},{"className":639},[],[641],{"type":411,"value":474},{"type":411,"value":643},"。公开 URL 本身并不带条目索引；索引保存在页面状态里。",{"type":406,"tag":407,"props":645,"children":646},{},[647],{"type":411,"value":648},"这就解释了为什么一些粗糙的下载器看到轮播就只抓第一项。如果第一项是照片，你想要的视频却在第三位，那你拿到的就是一个 JPEG。Any4K 的 Instagram 解析器会遍历完整的轮播清单，列出它找到的每个视频条目，让你自己选。如果轮播里只有照片、没有视频子项，解析会返回空，页面会提示「没有可下载的视频」——这是正确的结果，即使帖子本身是真实存在的。",{"type":406,"tag":407,"props":650,"children":651},{},[652],{"type":411,"value":653},"如果你想要某个具体条目而工具给了你错的，那就在浏览器里打开帖子、滑到目标条目、目视确认轮播索引，然后再粘贴一次 URL。即便 URL 没变，位置信息会保留在页面会话里。",{"type":406,"tag":414,"props":655,"children":657},{"id":656},"在-24-小时窗口内保存-instagram-stories",[658],{"type":411,"value":659},"在 24 小时窗口内保存 Instagram Stories",{"type":406,"tag":407,"props":661,"children":662},{},[663,665,671],{"type":411,"value":664},"Stories 的公开寿命是 24 小时，到期后从公开界面消失。想保存就得在窗口内动手。Story 的 URL 形态是 ",{"type":406,"tag":469,"props":666,"children":668},{"className":667},[],[669],{"type":411,"value":670},"instagram.com/stories/{username}/{story_id}/",{"type":411,"value":672},"，与帖子和 Reel 的格式不同——Story ID 是数字串，不是 shortcode，而且用户名是路径的一部分。趁 Story 还在线时复制这个 URL，再像粘贴帖子链接一样粘进 Any4K。",{"type":406,"tag":407,"props":674,"children":675},{},[676],{"type":411,"value":677},"24 小时一过，Story 清单就会返回空响应，任何工具都没东西可抓。那时视频并不是被认证墙挡住，而是直接从公开 CDN 上消失了。从 Instagram 外部，没有任何下载器能找回过期的 Story。",{"type":406,"tag":407,"props":679,"children":680},{},[681,683,689],{"type":411,"value":682},"精选 Story（Highlights）是另一种情况。它们是账号主在过期后选择固定到主页的 Stories，URL 形态完全不同（",{"type":406,"tag":469,"props":684,"children":686},{"className":685},[],[687],{"type":411,"value":688},"instagram.com/stories/highlights/{highlight_id}/",{"type":411,"value":690},"）。Highlights 会一直保留，从解析角度看更像普通帖子。",{"type":406,"tag":407,"props":692,"children":693},{},[694],{"type":411,"value":695},"私密账号的 Stories 在粉丝关系之外无法获取。如果账号设为私密、你又没关注，自己浏览器都看不到，下载器同样看不到。同样的限制适用于「仅密友可见」的 Story——即便账号是公开的，这些 Story 的受众也被限定在一份特定名单内，永远不会进入公开清单。",{"type":406,"tag":414,"props":697,"children":699},{"id":698},"一次-instagram-下载为什么会失败分步诊断",[700],{"type":411,"value":701},"一次 Instagram 下载为什么会失败（分步诊断）",{"type":406,"tag":407,"props":703,"children":704},{},[705],{"type":411,"value":706},"解析失败时，几乎所有情况都能归到六类原因里。请按下面这个顺序排查：",{"type":406,"tag":521,"props":708,"children":709},{},[710,720,730,740,750,760],{"type":406,"tag":429,"props":711,"children":712},{},[713,718],{"type":406,"tag":528,"props":714,"children":715},{},[716],{"type":411,"value":717},"私密账号。",{"type":411,"value":719}," 在隐私浏览窗口里、不带 Instagram 会话打开 URL。如果出现登录墙，说明该帖子被门控了。Any4K 无法绕过这道门，任何公开工具都不行。",{"type":406,"tag":429,"props":721,"children":722},{},[723,728],{"type":406,"tag":528,"props":724,"children":725},{},[726],{"type":411,"value":727},"帖子已删除或被移除。",{"type":411,"value":729}," 当 shortcode 不再解析时，Instagram 会显示标题为「Sorry, this page isn't available」的页面。如果在隐私窗口里看到这条提示，说明源已经没了，URL 也不再有效。",{"type":406,"tag":429,"props":731,"children":732},{},[733,738],{"type":406,"tag":528,"props":734,"children":735},{},[736],{"type":411,"value":737},"Story 已过期。",{"type":411,"value":739}," 如果你能查到时间戳，请确认距离发布是否已超过 24 小时；若超过，清单就是空的，没有恢复路径。",{"type":406,"tag":429,"props":741,"children":742},{},[743,748],{"type":406,"tag":528,"props":744,"children":745},{},[746],{"type":411,"value":747},"轮播里没有视频。",{"type":411,"value":749}," 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