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parameters for setting the compression rate of the encoder. because encoders differ in how the compresion rate is set (most codecs allow you to set a bitrate, but some others recommend setting a quality value, for which some use a integer, while others use a fixed-point decimal value...) we abstract from these settings and offer compresion rate choices to the client. the server maps these to the respective codec configurations.
use a high compression rate, i.e. do not care about quality and try to get a high frame rate on messy connections.
use a low compression rate, i.e. provide excellent quality over very good connections.
use a medium compression rate, i.e. provide decent quality over decent connections.