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为啥在 Youtube 上上传被水平翻转过的涉嫌侵权视频可以防止被站方删除

为了避过 Youtube 的 Content ID 系统 。Scott Smitelli 有一篇详细分析 Audio Content ID 如何工作的技术文章 ，他来自 Coding Horror 的评论 提到了这个翻转视频的技巧：Secondly, the audio and video detectors seem to work independently.……Assuming your content is being matched by the video portion of the detector, it was at one point possible to thwart the system by flipping the video horizontally -- such that text is mirror-imaged and people seem to drive their cars on the wrong side of the road. The YouTube employee I spoke with acknowledged that fact, and said that the rights holders had expressed concern about the loophole. Ultimately, the rationale was that it took too much effort for most users to modify videos in that way, and that "nobody wanted to watch a video that had been flipped," so the weakness stayed.Content ID 系统分为 Audio Content ID 和 Video Content ID 两部分，这样，即使视频部分能够欺骗系统，音频部分还是随时可能被检测出来。Youtube 说它有超过 50 万小时 的参考文件来进行匹配…… http://www.youtube.com/t/contentid Fun with YouTube\u0026#39;s Audio Content ID System：http://www.csh.rit.edu/~parallax/ YouTube vs. Fair Use：http://www.codinghorror.com/blog/2010/09/youtube-vs-fair-use.html http://youtube-global.blogspot.com/2012/10/improving-content-id.html
■网友
ContentID系统上线早期，确实有很多方法来绕过，比如上下翻转、左右翻转、速度调节等等。根据这些使用情况，算法也在不断优化。YouTube的版权库还不完善，如果版权方上传视频晚于用户，系统无法保证之前上传的视频能被快速发现。当然，版权方也有选择保留视频的权利。
■网友
记得官方解释过版权时顺道说是不可以的啊。。。大概就是公司比如索尼把MV原文件发给youtube，后者会把每一段上传的视频跟自己数据库里的正版版权进行对照（声音和图像都对照，）再把确认侵权的干掉。视频里还顺道说，对照下来，偷录的也难逃法眼，颠倒或者什么小变动的也会被发现。这就不好解释你的问题了，要么是youtube没收到版权，数据库没判断出来，或是我记错了。


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