2.2.1.12.1 Rate
This parameter contains a comma-separated list of possible acceleration rates, each of which MUST be expressed as a speed-up factor relative to the average bit rate of the content, multiplied by 10. For example, a value of 15 indicates that the rate equals 1.5 times the average bit rate of the content.
The syntax of the Rate parameter is defined as follows.
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rate-value = 1*10DIGIT XSP-Rate = "Rate=" #rate-value
The rate-value parameter MUST be an integer in the range from 1 through 4,294,967,295.