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Barwick video-trial

Barwick video-trial






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  • Big picture, down to local focus on field corpus tool - audiamus

Barwick video-trial Barwick video-trial Presentation Transcript

  • Media madness I: PARADISEC video trial 2006 Linda Barwick Sydney Conservatorium of Music University of Sydney DELAMAN IV, London 2 November 2006
    • Collaborative digital research resource set up by University of Sydney, University of Melbourne & Australian National University, 2003. (UNE joined 2004)
    PARADISEC 75% fund ing from Australian Research Council LIEF Scheme (3 successful applications)
  • Why video?
    • From 1980s, portable battery-powered video cameras increasingly used by fieldworkers
    • Primary data for ethnographic studies of gesture, dance, performance, signed language, social interaction
    • Highly valued by cultural heritage communities
  • Threats to video
    • Obsolescence of consumer video formats (VHS, super-8, Hi-8 etc)
    • Media deterioration much more advanced that audio media (estimate 15 years)
    • Kept in private research collections rather than deposited in archives (hence less than ideal storage conditions, lack of metadata)
  • Deterrents to digitisation
    • Lack of internationally agreed archival formats and standards for digital video, hence researcher fear of making wrong choice
    • Difficulties of storage and management once digitised - huge filesizes difficult to manage on desktop computer
    • Lack of user-friendly and robust tools to allow researchers to analyse video data and collaborate
    • Ethical and rights obligations - fears of compromising security and anonymity of consultants by outsourcing
  • Preservation and Digital Sustainability
    • the only way to guarantee sustainability of digital audiovisual media is secure mass storage with well-structured metadata and an ongoing digital migration strategy, using authenticated streaming for access .
      • Kevin Bradley, APSR Sustainability Issues Discussion Paper, National Library of Australia, 2005.
      • International Association of Sound and Audiovisual Archives (IASA) Guidelines on the Production and Preservation of Digital Audio Objects (IASA-TC04). Aarhus, Denmark: International Association of Sound and Audiovisual Archives (IASA), 2004.
  • Purposes of trial
    • Feasibility study for video ingestion
      • select appropriate standards
      • test impact on existing systems
      • design archival workflows
      • model costs for future funding applications
    • Preserve significant collections
    • Provide access copies for researchers and communities
    • Provide test data for EthnoER online annotation projects
  • Equipment and data
    • Outsourced ingestion to professional video-maker (Paul Cockram) using Final Cut Pro 4 on Mac computer, ingesting video data from professional decks over firewire 400 cable.
    • Video formats tested: VHS, Hi-8, miniDV
    • Video files saved on 500GB LaCie firewire drive for transport
  • Formats and standards adopted for trial
    • Master copy: .dv standard (maximum quality coming across firewire into Final Cut Pro) (saved inside Quicktime .mov wrapper) - approx 15GB per hour
      • 720x576 pixels, 25 fps, PAL
      • Titles: basic metadata plus test signal at beginning of file, “end file” title at end of file.
      • No chapter markers unless depositor provides list of timecodes for this purpose
  • Access copies
    • Also sent to archive because of time taken to process (will review later)
    • DVD copy (MPEG 2) - compress item to approx 4GB. Save as muxed .mpg file or disk image .img
      • Chapter markers inserted every 5 minutes
    • Web copy (.mov or .mp4)
      • frame size 320 x 240 (480 x 360)
      • 30 frames per second
      • keyframe every 300 frames
      • data rate 40 - 50 KB/sec (320 - 400 kbps) or 100 - 120 KB/sec (800 - 960 kbps) for larger frame sizes.
  • Issues (1)
    • Damage to videos (dropped frames) may cause stall in ingestion, need to set FCP to tolerate
    • Some VHS tapes (1980s) had too many tracking errors to digitise
    • Unstable picture (both hi8 and VHS) leads to higher filesize in mpeg-2 (image stabiliser needed?)
    • Communication issues with contractor led to wrong filenames being used in titles, hence requiring reprocessing
    • Compression to DVD and web copies very slow (8 hours to process a 3-hour file) , ties up machine - better done in-house by batch processing
  • Issues (2)
    • Data deluge at time of HD shuttle
      • 500GB needing to be copied onto system - took a day
      • swamped storage (ill-prepared)
      • server partitions 200GB - not large enough, hence loss of time in copying across partitions
      • Backup scripts at Sydney and APAC became out of sync, leading to data not being written to tape in Sydney, or being removed from server before APAC could mirror
      • timeconsuming diagnosis and repair, but systems now redesigned
  • Transcoding for web delivery
    • EthnoER project working with CSIRO’s Annodex platform to deliver streamed video
    • Uses Ogg Theora - best transcoded from full-resolution version (currently done by CSIRO)
    • Online delivery of annotations via EOPAS (EthnoER online annotation standard) - developed with University of Queensland Vannotea team building on Michel Jacobson’s ITE work (LACITO)
    • More details at our December conference!
  • Costing and feasibility
    • Final report on data trial in preparation - we will post on our website and blog
    • Costing only of production (staff time, consumables) - model at this stage does not take into account long-term storage and networking costs, equipment deterioriation
    • Funding application for equipment in 2007 unsuccessful - we will regroup
  • Video data in PARADISEC collection (30/10/06)
    • 0.5% of collection files account for 19% of the data volume
  • Further information: Thanks to: Participating Universities Australian Research Council Australian Partnership for Advanced Computing Australian Partnership for Sustainable Repositories GrangeNet http://paradisec.org.au http://blogs.usyd.edu.au/elac http://ethnoer.unimelb.edu.au http://conferences.arts.usyd.edu.au/index.php?cf=11