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Step response metric for video encoder rate control characterisation

: Globisch, R.; Ferguson, K.L.; Sanchez, Y.; Schierl, T.


26th ACM Workshop on Network and Operating Systems Support for Digital Audio and Video, NOSSDAV 2016 : Klagenfurt, Austria, May 10 - 13, 2016
New York: ACM, 2016
ISBN: 978-1-4503-4356-5
International Workshop on Networking and Operating System Support for Digital Audio and Video (NOSSDAV) <26, 2016, Klagenfurt>
Fraunhofer HHI ()

Adaptive streaming is a widely-used solution to avoid playback interruptions and compensate for insufficient bandwidth or momentary congestion. A temporary reduction in bitrate results in less or no video break-up and rebuffering. The rate control mechanism of a codec implementation allows the selection of a target bitrate and tries to meet this target within certain constraints e.g. number of frames, with a certain percentage overshoot. However the target bitrate is not always instantaneously achievable, and the number of bits required to encode a frame are highly content-dependent. In this paper the Codec Step Response metric is proposed to measure the effectiveness of a codec rate control at responding to instantaneous rate variations. This metric allows the measurements of the suitability of a rate control implementation for an application or access network.