数据基本码流 data elementary stream ; DES
基本码流时钟基准 ESCR ; elementary stream clock reference
打包的基本码流 Packetized Elementary Stream
的基本码流 Packetized Elementary Stream ; PES
基本码流包 Packetized Elementary Stream ; PES
复用的基本码流包 Packetized Elementary Stream
分组基本码流 Pa c k e t El e me n t a r y St ; PacketElementaryStream
包基本码流 PES ; PacketizedElementaryStream
该编码方法通常生成两种视频流：基本层码流和增强层码流。
FGS video streaming is to code a video sequence into a base layer and multiple enhancement layers.
基本思想是保持基本层码流不变的情况下，根据带宽的变化动态地改变传输中的码流来提高视频质量。
The basic idea is to change the enhancement bitstream transmitted to improve the performance while the base layer remains the same.
基本层码流是必须传输的，并且码率低；
The former has a lower code stream and it must be transmitted.
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