在YouTube学习
2022年9月初，YouTube官方博客写道 YouTube学习的下一章, announcing YouTube’s plans to interoperate better with schools via the “YouTube Player for Education.”
Many schools have avoided relying on YouTube as a video host for at least three good reasons. The first is that YouTube is frequently blocked by corporate and international firewalls, presenting a challenge to reliably delivering curricular content to off-campus students. Also, YouTube is designed as a social media platform rather than a video management system, so content cannot be updated within a video entry; if the teacher receives feedback about a video lecture that warrants a revision, a completely new video entry needs to be created and re-embedded in every instance of the course using the old version.
Finally, YouTube is a video platform embedded in a social media platform owned by Alphabet, 历史上最成功的广告公司, 并因此被设计为呈现广告, 收集用户特定的行为数据, and recommend potentially inappropriate videos to keep viewers engaged with the platform rather than course the video was embedded into.
The first feature announced in YouTube’s blog post addresses the third and most compelling problem listed above: an embedded YouTube Player for Education won’t show ads or recommend other videos that would distract students from the instruction. (The other new feature is in-video quizzes, which deserves—and has—a column of its own [go2sm.com/moreactive].)这个功能建立在谷歌课堂现有的功能之上, where additional GET parameters in the IFrame URL for the embedded video suppresses those distractions. 至少，必须添加这些参数(在撰写本文时):
?enablejsapi = 1&rel=0&showinfo = 0&modestbranding = 1&embed_config = % 3一7 b % 22 hideinfobar % 22% % 2 c % 22 disablerelatedvideos %一22% 3 % 7 d
Adding these parameters makes the embedded YouTube player better behaved when used in a course. 大多数参数使用透明的命名约定. embed_config参数是一个url编码的json字符串. The meaning of rel accepts ambiguity: leaving it out presents recommendations at the end; including it makes the video reload to the beginning. EnableJsApi tells YouTube that your page intends to interact via javascript with YouTube’s IFrame API (go2sm.com/iframeapi) that uses PostMessage methods and OnMessage events to facilitate cross-domain communication between the YouTube player and the page embedding it. This allows your educational website to circumvent CORS restrictions and provide a custom user interface and control set for the video. A good example can be seen by signing up with a YouTube Player for Education partner like EdPuzzle (www.edpuzzle.com).
I haven’t seen YouTube Player for Education’s video quiz implementation except in demonstration screencaps in their blog post, but I expect that they’ll extend that IFrame API to use PostMessage for reporting quiz performance data back to the parent page to be potentially included in a grade book or to route the student on an adaptive learning path based on their quiz answers. The alternative to using PostMessage for that—the usual technique adopted—would be for the YouTube Player for Education IFrame to be created via LTI launch instead of a vanilla IFrame embed. The PostMessage/OnMessage solution is simpler and more flexible for both YouTube and the platform embedding it in this use case.
YouTube Player for Education is something to keep an eye on as it matures in 2023. 我不认为它会成为一项特别具有颠覆性的技术, but it will prove a welcome way for teachers who are exceptionally on camera to augment their teaching salaries. 而他们课程中嵌入的视频不会有广告, 在YouTube上向公众提供的相同视频将会. School administrators would be wise to consider the consequences of this for both expanding and protecting their school’s reputation and brand to develop fair and sensible guidance that balances those priorities with academic freedom and professional development.
而YouTube在教育视频播放器上有引擎盖, 现在是他们兑现承诺的时候了 多音轨和描述性音频馈送 中演示的特性 刺客信条英灵殿的故事预告片 为盲人学生提供YouTube内容的音频描述. While a social media platform may not be ideal for hosting curricular content in an otherwise secure course, 它可以很好地与学校的学术团体进行沟通. Requiring community members who are blind to follow a link in the description to the video’s audio described version sends the unintended message that they are second-class citizens of the school community.
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