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钉钉云课堂实现自由控制播放速度方法

Social Companion

2020-03-10

导读：钉钉的云课堂为了保证教师对教学过程的强管控，有的操作不考虑学习者感受，对于视频教学如果还是按课堂教学那么呆板

钉钉的云课堂为了保证教师对教学过程的强管控，有的操作不考虑学习者感受，对于视频教学如果还是按课堂教学那么呆板是很反人性的，不仅有水印影响观看体验而且不支持倍速播放，看讲课比较慢的老师的视频，无疑是一种煎熬。过于慢的速度，反而会影响效率。本文仅限于技术交流，请勿用于其他不当用途。

思路参考：

https://solstice23.top/archives/1075
https://www.cnblogs.com/1024th/p/12317158.html
https://www.cnblogs.com/1024th/p/12330849.html

如果你是一个毫无基础的小白也没关系，按照步骤一步步走就可以。

思路

云课堂的本质是一个（套壳的）网页，限制特别多，例如不允许开控制台等等。我们可以从另一个角度入手，中间人注入 js 来实现目的。

暴力地把 js 脚本用 base64 编码后插入到<head>里。

提示

该方法仅 PC 端可用（其实手机也可以）。

实现倍速播放，学习记录会按实际播放时间记录。

一、安装 Fiddler

下载安装https://www.telerik.com/fiddler

二、设置 Fiddler 捕获HTTPS 流量

打开 Fiddler，点击顶栏 “Tools”，在弹出的菜单中点击“Options…”。

在弹出的窗口中切换到顶部的 “HTTPS” 菜单，勾选 “Capture HTTPS CONNECTs” 和 “Decrypt HTTPStraffic” 复选框，然后点击 OK。

勾选后会弹出安装证书的窗口，确认即可。

如果出现下面这样的黄条，点击黄条即可。

三、中间人注入

在 Fiddler 中按下 Ctrl+R。弹出一个代码编辑器窗口。

在代码编辑器窗口按下 Ctrl+F，在弹出的窗口中输入 OnBeforeResponse 并按下回车。找到 OnBeforeResponse 函数（下图所示）。

复制下面的代码，并粘贴到下图中的位置，然后按下 Ctrl+S 来保存。

以下代码部分来自 HTML5播放器增强插件，对原作者深表感谢！

注意：代码第一行特别长（耐心）。

var sToInsert = "

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>";

oSession.utilDecodeResponse();

oSession.utilReplaceOnceInResponse('</head>',sToInsert + '</head>', 0);

快捷键说明

播放速度调节

按键C：加速播放 +0.1

按键X：减速播放 -0.1

按键Z：正常速度播放

播放时间定位

方向键右→：快进3秒

方向键左←：后退3秒

按键F：下一帧

按键D：上一帧

音量调节

方向键上↑：音量升高 1%

方向键下↓：音量降低 1%

图像参数调节

按键E：亮度增加%
按键W：亮度减少%
按键T：对比度增加%
按键R：对比度减少%
按键U：饱和度增加%
按键Y：饱和度减少%
按键O：色相增加 1 度
按键I：色相减少 1 度
按键K：模糊增加 1 px
按键J：模糊减少 1 px
按键Q：图像复位

画面调节

按键S：画面旋转 90 度
按键回车：进入全屏（只支持部分网站 B站，油管），还想增加什么网站的话，和我反馈一下！

兼容性问题

可以使用组合键临时停用插件，例如播放/暂停默认为空格键，那么使用Ctrl+space(空格键)即可暂停使用一次插件。

如何一劳永逸，不再每次设置

每次打开钉钉云课堂之前先打开 Fiddler。

好看请点这里↓↓↓

【声明】内容源于网络

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