Variable Bit Rate MPEG-2 Research Articles

Impact of local coding efficiency on the modelling of flows derived from VBR MPEG2 video coding

AbstractThis Letter proposes a cell generation model based on a MMPP(2) process which aims to simulate the unsmoothed data output from a variable bit rate (VBR) MPEG‐2 video encoder. By taking into account the coding efficiency in some image zones, we have improved the modelling. This coding efficiency is directly related to the properties of the compression methods used and may lead to a periodic phenomena given the inter‐arrival times between data. The developed model integrates this periodicity in order to refine the modelling. Experimental simulations of VBR MPEG video transmission over ATM were performed to validate this approach. The results expressed in terms of the inter‐arrival time characteristics show the improvement brought by accounting for local coding efficiency. Copyright © 2004 AEI