Polyphase spatial subsampling multiple description coding of video streams with h264

Abstract

In this work. we propose a Multiple Description (MD) ciding system for video streams. In particular. our scheme originates four descriptions from the spatially downsampled polyphase components ofthe original frames. Each description is compressed independently with the recent H264lAVC video coding standard. it i s packetized and sent over an error prone network. In case of errors i n one or more descriptions. appropriate concealing i s applied at the receiver, before insertion of the corrected Crames into the corresponding receiver frame buffers. We propose and compare different concealment solutions and a post processing stage to attenuate visual effects related to MD coding. We analyze the trade off between robustness to channel errors and coding efficiency. comparing the proposed technique with Single Description (SD) video coding with H264lAVC. Experimental results validate the effectiveness ofthe proposed scheme.

Slice-level rate-distortion optimized multiple description coding for H.264/AVC

“…Considering other existing schemes, we also compare [7] with multiple description coding polyphase spatial subsampling using two sub-sequences (PSS-MDC, [9]). We refer to the curves in [8] with Ô ¼ ½ and Ô ¼ ¼½.…”

Adaptive block distance interpolation for MDC frame recovery

“…with R-D as a trade-off [1]. MDC can segment the video source into multiple descriptions from the temporal, spatial, and/or frequency domains, where the former two emphasize more on error resilience, and the latter more on R-D [2]- [4]. Hybrid-domains based MDC methods [5], [6] aiming for balancing between error resilience and R-D also exist.…”

TURINstream: A Totally pUsh, Robust, and effIcieNt P2P Video Streaming Architecture

“…3 shows the improvements in terms of CI obtained using 4 descriptions (see square markers); clearly this advantage is due to the fact that when D = 4 the reception of a single stripe guarantees service continuity, even if with proportionally reduced video quality. Nevertheless, such gain can be achieved at the expense of higher video coding and decoding computational costs and a higher bitrate overhead with respect to standard video coding [7], [16]. The observation that TURINstream achieves a good performance with D ≤ 4 is of paramount importance since most of the MDC video coding schemes available in the literature are designed for 2 or 4 descriptions [7], [16], [17], [18].…”