Streaming Perspective StreamQ
Simplify streaming measurement with our StreamQ rating system
Keynote’s StreamQ™is the de facto industry-standard metric for measuring the streaming media user experience. StreamQ is measured in letter grades from A+ to F that indicate the amount of time a user had to wait or experience interruptions ("Frustration Time") versus the time actually spent enjoying the content ("Play Time"). To determine the StreamQ for a particular check, Keynote adds up the connect time, buffer time and rebuffer time. Then, a one second penalty is added for each rebuffer event. If this final "adjusted frustration time" is less than 6 seconds, the grade is an A+; 6 to 9 seconds A, 9 to 12 seconds, B+, etc.
This time-profile diagram shows a stream that suffered from rebuffering during playback. Each rebuffer event adds a one second penalty to the overall frustration time, in addition to the actual length of the rebuffering.
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