可变比特率（VBR）和恒定比特率（CBR）。
比特率可以近似不变以支持恒定比特率业务或者高度变化以支持可变比特率业务。
This bit rate can be approximately constant to support constant bit rate traffic or it can be highly variable to support variable bit-rate traffic.
针对异步视频对象编码，提出了一种速率控制算法，以达到恒定目标比特率。
This paper proposes a new rate control algorithm which can achieve a constant bit rate when coding asynchronous video objects.
ABR则是每个帧都有一个可变的比特率，但是其平均比特率是恒定的。
ABR has a variable bitrate for each frame, but its average bitrate is a constant.
ABR则是每个帧都有一个可变的比特率，但是其平均比特率是恒定的。
ABR has a variable bitrate for each frame, but its average bitrate is a constant.
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