什么是playback buffer

视频预加载的部分
Playback buffers
Horizontal distance:amount of delay
Vertical distance:Size of the buffer (how many bytes are in the path)
这个variable delay有upper bound和lower bound
Lower bound: No less than packtization delay + propagation delay
Upper bound: There is a maximum delay that a packet could experience ( Upper bound可能会很大 )

在 received by laptop曲线和playback rate两条线之间:
同一条水平线上的三个点分别是:when it was sent, received and playbacked
Horizontal line上的buffer部分指的是:how long a particular byte has been buffered
Vertical line上的距离指的是:how many byte in the playback buffer (Occupancy of the buffer)
当没有足够的buffer
就会进入到rebuffering的状态来获得更大的buffer
即视频停下加载

Conclusion

本文介绍了视频播放中的缓冲机制,包括水平距离(延迟量)和垂直距离(缓冲区大小)。文中探讨了缓冲区变量延迟的上下限,并解释了当缓冲不足时如何通过重新缓冲来增加缓冲区容量。


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