ISO 21077:2021

Overview

ISO 21077:2021 - Space data and information transfer systems: Digital motion imagery is an international (CCSDS-derived) recommended standard that provides a common reference and framework for capturing, encapsulating, transmitting and distributing digital motion video and imagery in space systems. It covers both real-time streaming (spacecraft-to-spacecraft and spacecraft-to-ground) and recorded video transfers, addressing how video should be represented, interfaced, and transported between spacecraft elements and ground systems. The document focuses on interoperability and practical interface requirements rather than prescribing video quality levels.

Key topics and technical requirements

• Video formats & characteristics: defines the kinds of parameters that must be specified for interoperability - frame rate, aspect ratio, compression choices, color sampling and bandwidth considerations.
• Interfaces and standards alignment: recommends use of existing interface standards (SMPTE, ITU-R, HDMI, LVDS, etc.) and specifies how camera systems should match spacecraft video interfaces.
• Encapsulation & transmission: covers encapsulation schemes (e.g., IP/CCSDS encapsulation), transport protocols and considerations for high-bandwidth video transport; annexes address bundle/DTN considerations for space delay-tolerant links.
• Recorded vs. real-time workflows: distinguishes continuous (real-time) streaming intended for immediate use from file-based transfers and provides guidance for both modes.
• Audio inclusion: addresses integration of associated audio streams with motion imagery.
• Interoperability & testing: emphasizes pre-launch system design reviews and ground-to-ground performance testing between agencies to ensure operability and video sharing.
• Scope exclusions: does not cover specialized high-speed scientific motion imagery or multi-spectral imaging, though such systems must conform to the specified spacecraft video interfaces if used in video mode.
• Notable updates (2021): second edition adds support for MPEG‑4 recording and JPEG 2000 transmission.

Applications and who uses it

ISO 21077:2021 is intended for any mission or organization that produces, consumes, transcodes or distributes motion imagery in space contexts:

• Space agencies and mission integrators establishing spacecraft and ground-segment video subsystems
• Payload and camera system engineers defining interface and compression choices
• Ground station and operations teams planning real-time monitoring, telemetry and distribution
• Aerospace systems architects ensuring cross-agency interoperability for collaborative missions
• Vendors of spacecraft video encoders, decoders and transmit/receive equipment

Practical benefits include reduced integration risk, clearer interface definitions, and a standard framework to enable HD or web-stream levels of video sharing across heterogeneous space networks.

Related standards

Relevant referenced standards include ISO/IEC 14496‑10 (H.264/MPEG‑4 AVC), ISO/IEC 15444‑3 (Motion JPEG 2000), CCSDS recommendations such as IP over CCSDS (CCSDS 702.1) and CFDP (CCSDS 727.0), and industry interface standards from SMPTE and ITU-R. These help implement encoding, transport and physical interface choices while maintaining interoperability.