  In video coding, compressed videos with certain and constant quality can
ensure quality of experience (QoE). To this end, we propose in this paper a
novel PID-based quality control (PQC) method for video coding. Specifically, a
formulation is modelled to control quality of video coding with two objectives:
minimizing control error and quality fluctuation. Then, we apply the Laplace
domain analysis to model the relationship between quantization parameter (QP)
and control error in this formulation. Given the relationship between QP and
control error, we propose a solution to the PQC formulation, such that videos
can be compressed at certain and constant quality. Finally, experimental
results show that our PQC method is effective in both control accuracy and
quality fluctuation.
