Traffic and Quality Characterization of the H.264/AVC Scalable Video Coding Extension

Table 1

Video traffic and quality metrics for encoding with given quantization scale.

Metric	Definition
Frame size metrics
𝑀	Number of frames in video sequence
𝑋𝑚	Size [bits] of encoded video frame 𝑚, 𝑚=1,…,𝑀
𝑋=(1/𝑀)∑^𝑀𝑚=1𝑋𝑚	Mean frame size of encoded video sequence
𝑆^2𝑋=(1/(𝑀−1))∑^𝑀𝑚=1(𝑋𝑚−𝑋)^2	Variance of frame sizes (𝑆𝑋 is the standard deviation [bits])
CoV𝑋=𝑆𝑋/𝑋	Coefficient of variation of frame sizes [unit free]
𝑋max=max𝑚=1,…,𝑀𝑋𝑚	Maximum frame size [bits]
PtM𝑋=𝑋max/𝑋	Peak-to-mean frame size ratio [unit free]
Bit rate metrics
𝑇	Frame period [s]
𝑅=𝑋/𝑇	Mean bit rate [bits/s]
𝑅max=𝑋max/𝑇	Peak bit rate [bits/s]
GoP size metrics
𝑁	Number of frames in GoP
𝑌𝑛	Size of GoP 𝑛, 𝑛=1,…,𝑀/𝑁 [bits]
𝑌=(𝑀/𝑁)∑^𝑀/𝑁𝑛=1𝑌𝑛	Mean GoP size [bits]
PtM𝑌=𝑌max/𝑌	Peak-to-mean GoP size ratio [unit free]
CoV𝑌=𝑆𝑌/𝑌	Coefficient of variation of GoP sizes [unit free]
Frame quality metrics
𝑄𝑚	PSNR quality of frame 𝑚 as defined in (2)
𝑄=(1/𝑀)∑^𝑀𝑚=1𝑄𝑚	Average PSNR quality of video sequence
CoQV=𝑆𝑄/𝑄	Coefficient of quality variation