机器先看的是结构。YouTube的内容长得都差不多：有标题、有简介、有标签，有时还有清晰的时间轴和章节。标题往往就是一个问题或主题，简介相当于摘要和补充说明，标签和分类是现成的语义标记，章节和时间点把一条长视频切成若干段。
So, the decision ended up being: give each party its own set of basic Android libraries, and make the dynamic linker ensure in runtime that programs associated with vendor, say, the camera provider services (a process run by init, which is allowed to open /dev/video0 and which services captured frames via a Binder service registered with the servicemanager) can only link dynamically and dlopen .so files from /vendor/lib64, even if it is given an LD_LIBRARY_PATH or LD_PRELOAD.
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