Ineluctability of oscillations in systems with digital implementation of derivative feedback

Gosline, Andrew H.; Hayward, Vincent; Michalska, H.

doi:10.1016/j.automatica.2011.08.017

Cited by 4 publications

(1 citation statement)

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“…This is due (i) to the discrepancy between the model and the actual RD characteristics and (ii) to the fact that the QPs provided by the optimization process have to be rounded before being used by the video encoders. This type of oscillatory behavior due to quantized inputs has been considered in [62] and [63]. Using scalable video coders, such as H.264/SVC, combined with layer filtering instead of transcoding or encoding at various QPs would probably enhance the oscillating behavior.…”

Section: ) Constant Channel Ratementioning

confidence: 98%

Predictive Encoder and Buffer Control for Statistical Multiplexing of Multimedia Contents

Changuel¹,

Sayadi²,

Kieffer³

2012

IEEE Trans. on Broadcast.

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International audienceStatistical multiplexing of video contents aims at transmitting several variable bit rate (VBR) encoded video streams over a band-limited channel. Rate-distortion (RD) models for the encoded streams are often used to control the video encoders. Buffering at the output of encoders is one of the several techniques used to smooth out the fluctuating bit rate of compressed video due to variations in the activity of video contents. In this paper, a statistical multiplexer is proposed where a closed-loop control of both video encoders and buffers is performed jointly. First, a predictive joint video encoder controller accounting for minimum quality, fairness, and smoothness constraints is considered. Second, all buffers are controlled simultaneously to regulate the buffering delays. This delay is adjusted according to a reference delay constraint. The main idea is to update the encoding rate for each video unit according to the average level of the buffers, to maximize the quality of each program and effectively use the available channel rate. Simulation results show that the proposed scheme yields a smooth and fair video quality among programs thanks to the predictive control. A similar buffering delay for all programs and an efficient use of the available channel rate are ensured thanks to the buffer management and to the predictive closed-loop control

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Section: ) Constant Channel Ratementioning

confidence: 98%