Live Televison in a Digital Library
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http://researchcommons.waikato.ac.nz/ Research Commons at the University of Waikato Copyright Statement: The digital copy of this thesis is protected by the Copyright Act 1994 (New Zealand). The thesis may be consulted by you, provided you comply with the provisions of the Act and the following conditions of use: Any use you make of these documents or images must be for research or private study purposes only, and you may not make them available to any other person. Authors control the copyright of their thesis. You will recognise the author’s right to be identified as the author of the thesis, and due acknowledgement will be made to the author where appropriate. You will obtain the author’s permission before publishing any material from the thesis. Live Television in a Digital Library Maxime Roüast This thesis is submitted in partial fulfillment of the requirements for the Degree of Master of Science at the University of Waikato. October 2011 © 2011 Maxime Roüast 2/124 Abstract Nowadays nearly everyone has access to digital television with a growing number of channels available for free. However due to the nature of broadcasting, this huge mass of information that reaches us is not, for the main part, organised—it is principally a succession of images and sound transmitted in a flow of data. Compare this with digital libraries which are powerful at organising a large but fixed set of documents. This project brings together these two concepts by concurrently capturing all the available live television channels, and segments them into files which are then imported into a digital video library. The system leverages off the information contained in the electronic program guide and the video recordings to generate metadata suitable for the digital library. By combining these two concepts together this way, the aim of this work is to look beyond what is currently available in the digital TV set top boxes on the market today and explore the full potential—unencumbered by commercial market constraints—to what the raw technology can provide. 3/124 Contents 1. Introduction ............................................................................................................................................. 6 1.1. In more details ................................................................................................................................ 7 1.2. Replay Me! simplified diagram ................................................................................................. 9 1.3. Synopsis .......................................................................................................................................... 11 2. Background ........................................................................................................................................... 13 2.1. Recent television trends ........................................................................................................... 13 2.2. Digital video analysis and retrieval ...................................................................................... 15 2.3. Existing commercial approaches .......................................................................................... 17 2.3.1. Solutions for enterprises ................................................................................................. 17 2.3.2. Products aiming at the residential market ............................................................... 23 2.4. Existing video digital libraries research projects ........................................................... 27 2.4.1. The Open Video Digital Library (OVDL) .................................................................... 28 2.4.2. Informedia Digital Video Library ................................................................................. 32 2.5. Missing parts ................................................................................................................................. 36 3. Broadcast Television ......................................................................................................................... 38 3.1. Compression ................................................................................................................................. 38 3.2. Transmission ................................................................................................................................ 42 3.3. Processing Input and Output .................................................................................................. 44 3.3.1. Multiple channels concurrently .................................................................................... 44 3.3.2. Real time operation and hardware limits ................................................................. 49 3.3.3. Streaming capabilities ...................................................................................................... 56 4. Television recording implementation details .......................................................................... 59 4.1. Media Portal TV Server Plugin ............................................................................................... 59 4.2. Listing the possible concurrent recorded channels ...................................................... 60 4.3. Getting access to the EPG off-the-air ................................................................................... 62 4/124 4.4. Automatic video segmentation .............................................................................................. 64 4.5. Exporting the finished recordings with metadata ......................................................... 66 4.6. Recordings queuing system .................................................................................................... 68 4.7. Recording schedules management and disk space optimisation ............................. 70 4.8. Advanced configuration and activity reporting .............................................................. 73 5. Digital Library design ........................................................................................................................ 75 5.1. Greenstone Digital Library ...................................................................................................... 75 5.2. Processing new television recordings ................................................................................ 76 5.3. Creating the searching index and the browsing structure .......................................... 80 5.4. Accessing and managing the digital video library .......................................................... 82 5.4.1. The browsing interface .................................................................................................... 83 5.4.2. The searching features ..................................................................................................... 86 5.4.3. The embedded video streaming player ..................................................................... 88 5.4.4. Adding user-edited metadata and extra features .................................................. 91 5.4.5. Content management functionalities ......................................................................... 93 6. HCI considerations and user study .............................................................................................. 95 6.1. Replay Me!’s interfaces and HCI ............................................................................................ 95 6.2. User study design and goals .................................................................................................102 6.3. Results summary of the user study ....................................................................................104 6.3.1. General and system satisfaction results ..................................................................104 6.3.2. Ideas and comments from the participants ...........................................................109 7. Conclusion ...........................................................................................................................................113 8. References ...........................................................................................................................................116 5/124 1. Introduction Watching television on demand is increasingly common in people’s homes (Elsweiler, Mandl, & Kirkegaard Lunn, 2010). Solutions range from Internet based catch-up TV services such as TVNZ On Demand or iSKY to more closely integrated TV solutions such as Tivo or MySKYHDi. Each of these solutions enrich the viewer experience, however there are also commercial factors involved that mean there are also deliberate limitations in what is provided. For example, the Tivo system does not allow the recorded content to be directly viewed (streamed) from another television or computer inside the same house. It also requires a broadband service to receive the 14 days “enriched version” of electronic program guide (EPG) to operate, even if this information is available for 7 days in a basic form directly from the TV signal. Moreover, the digital video recorder (DVR) MySKYHDi does not allow the subscriber to backup their recordings for later watching, nor does it allow them to add additional disk space to the system to extend the recording capabilities of the machine—something that is rather frustrating given the increase in the number of channels broadcasted in high definition