Abstract
The MPEG immersive video (MIV) has been designed to remove the redundancies of multi-view videos and merge the residuals into two textures and two geometry videos; therefore, four bitstreams and video decoders are required to provide six degrees of freedom (6DoF) in virtual reality (VR) in MIV. This letter proposes a sub-bitstream packing method and realisation in tiled streaming for MIV to provide a single bitstream for legacy systems that have a single decoder without an increase in the server-side storage. The proposed method divided the input videos into tiles in the compressed-domain to accomplish two goals: (i) generate a merged bitstream using the existing four bitstreams for legacy systems and (ii) improve the quality of an immersive video by disabling the deblocking filter. For a player with one or few numbers of decoders, the extracted tile sub-streams were merged by the proposed four specific mixed-quality tiling and packing methods using a motion-constrained tile set (MCTS), while complying with the high-efficiency video coding (HEVC) standard. Experimental results demonstrated that the proposed sub-stream packing method required a single decoder and exhibited 17.40% decoding time and 0.81% bjontegaard-delta rate (BD-rate) savings on Y-PSNR saving compared to the non-tiled streaming method.
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