Audio Visual Design Guidelines

Recording

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This chapter covers the primary components, ICT architecture considerations, and best practices for planning, designing, and deploying a lecture capture system.

A lecture capture system consists of three key components:

  • Ingest is the capture of audiovisual sources and the creation of encoded digital video content
  • Management is the data storage, library categorisation, and video delivery of encoded digital video content
  • Playback is the decoding of the stored video data for viewing

Lecture capture systems may be integrated with standard AV equipment and many of the standards and best practices for commercial AV installations apply equally to a commercial lecture capture deployments.

 

Scope of this Document

This chapter focuses on lecture capture as it relates to the digital recording of video, audio, and related metadata or annotations. Lecture capture is primarily used for reviewing a lecture session after the fact, distance learning, or other education-related use-cases.

Other specialised recording systems such as multi-track audio recording, or CCTV security camera management systems are outside the scope of this document.

Glossary of Terms

TermDefinition
ABR;

Smooth Streaming

Connection speed, quality, and device types may impact the ability to stream video at certain quality settings, ABR automatically adjusts the video quality as the video plays to match the connection quality
AnnotationAn image composition method for representing notes and markups of an image or video. Annotations are typically drawn freehand onto a touch interactive display, or using a stylus
Audiovisual (AV)Encompasses the processing of audio and video components for presentation or recording systems. May include interactive components such as touch displays. May be automated by a control system
Bitrate;

Data rate

In computing, and transmission of data streams, bitrate is the number of data bits that are transferred per second
CodecHardware or software designed to encode or decode a digital data stream. Codecs may be used to encode a video signal so it may be saved as a video file, and codecs may be used to decode a video file or incoming data stream so that it may be viewed
CDNContent Delivery Network (CDN) is a distributed network specifically designed for video streaming delivery for large audiences connected over the internet
Flipped ClassroomA blended learning strategy that reverses traditional learning environment where students watch recorded content and carry out discussions and  research during the class session
FTPFile Transfer Protocol is a communications standard for sending digital files over a network
HDBaseTA standard for the transmission of ultra-high-definition video & audio, ethernet, and control data over twisted pair cabling
HIDHuman Interface Device is a peripheral that connects to a computer to allow a user to interact and provide input. Examples include keyboard and mouse
HLSHTTP Live Streaming (HLS) is a web protocol for delivery of audio and video content to viewers via the internet
HTTP communicationHypertext Transfer Protocol (HTTP) is the foundation of data communication for the world-wide web
ICT ArchitectureInformation and communications technology architecture encompasses the computers, servers, phone systems, and network switching and routing for an organisation’s network
IP AddressAn Internet protocol address (IP Address) is used for network communication between computer devices. The IP address allows a device to be identified on the network
LANLocal Area Network (LAN) is a network of interconnected computers within a building or department
Multi-stream RecordingMulti-stream recording (aka multi-camera recording) is a lecture recording method whereby multiple individual video sources are captured in real time and saved as a single recording session. During playback, all streams are frame-synchronised and viewers may freely switch between or overlay (PiP) the available video content streams
Picture-in-Picture (PIP);

Windowing Processor

A combined video image composed of two or more video sources. Combined images may be side by side taking up half the viewable area, or one image may take up the entire viewable area with the other displayed on an inset window positioned in the corner
QoS;

Traffic Shaping

Quality of Service is a method of prioritising specific, time-sensitive network data traffic to ensure it reaches its destination with minimal delay
SamplerateIn digital audio, samplerate is a measure of audio samples per second. High samplerates produce a high fidelity sound
SD CardSecure Digital (SD) memory card digital storage media
WANWide Area Network (WAN) is a computer network that spans over large geographical distances
WebinarInteractive online seminar or lecture delivered to viewers via the internet

Stakeholders

Below is a list of stakeholders commonly involved in the planning, deployment, and maintenance of a lecture capture system:

  • AV and ICT Managers (design of integrated technology)
  • End Users (functionality, features, and user experience)

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