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Online Journal of Space Communication

Article Title

Distributed HDV Post-Production over Trans-Pacific ATM Satellites

Authors

E. ShuFollow

Abstract

http://acts.grc.nasa.gov/docs/SCAN_20010912124441.pdf

This paper describes a joint collaboration between government and industry teams in the United States and Japan to demonstrate distributed high definition video (HDV) post-production on a global scale using a combination of high data rate satellites and terrestrial fiber optic asynchronous transfer mode (ATM) networks. The experiment is one of the activities arising from the Japan-U.S Cooperation in Space Project, and links the U.S. mainland to Hawaii using the NASA Advanced Communications Technology Satellite (ACTS) and Hawaii to Japan using Intelsat.

A series of links was established, and on March 27, 1997, HDV source material was transmitted between Sony Pictures High Definition Center (SPHDC) in Los Angeles and Sony Visual Communication Center )VCC) in Shinagawa, Tokyo, demonstrating that satellites can deliver digital image traffic at OC-3 data rates and quality comparable to that of fiber optic cables. Post-production compositing peformed in Tokyo on a green-screen HDV clip transmitted from Los Angeles and comparison of an HDV clip to its original source after one trans-Pacific satellite round-trip demonstrated the success of this high data rate communications channel for rapid transfer of HDV between remote shooting locations and post-production facilities. Correlation of atmospheric effects with cell loss, coded drop-out, and picture quality were made.

The 1.2 Gbps high definition video stream was compressed using a proprietary Mitsubishi MPEG-2 codec that is ATM compatible. The peak data rate of the codec was 22 Mbps.

This same experiment will later provide quality high rate communication channels for the rapid transfer of HDV masters from remote shooting locations around the world to post production facilities for editing, dubbing, distribution, etc.

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