Thursday, September 29, 2022

MPEG Scene Descriptions Adds Support for Immersive Media Codecs

At the 139th MPEG meeting, MPEG Systems (WG 3) issued the Committee Draft Amendment (CDAM) for ISO/IEC 23090-14 Scene Description support for immersive media codecs. CDAM is the first formal milestone of the amendment development approval process.

ISO/IEC 23090-14 specifies the coded representation of scene descriptions, and this new amendment facilitates the integration of Video-based Point Cloud Compression (V-PCC, specified in ISO/IEC 23090-5) and MPEG Immersive Video (MIV, ISO/IEC 23090-12) into a scene.

Immersive media codecs such as V-PCC and MIV encode immersive media data with multiple conventional 2D video codecs. The decoded bitstreams from each video decoder are combined to reconstruct the immersive media presentation. The scene description of ISO/IEC 23090-14 is based on the GL Transmission Format (glTF), which lacks support for integrating multiple video bitstreams into a single 3D object. This amendment enables the association of multiple buffers with a single mesh object.

Additionally, it enables these buffers to deliver decoded components of V-PCC or MIV objects to the rendering engine so that the rendering engine can reconstruct the 3D point cloud or immersive video content. As the components of Visual-based Volumetric Visual coded (V3C) objects are encoded as 2D videos, support for YCbCr formats is also added.

The amendment is planned to be completed, i.e., to reach the status of Final Draft Amendment (FDAM), by the end of 2023.

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