因为模型真正能稳定吃到的，一般还是是文本层。大部分短视频的问题就在于，画面大于文本：文本的作用是配合画面。
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，详情可参考safew官方下载
For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
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