5 16-12 curated series #2 presentation
DESCRIPTION
Hot Topics: The DuraSpace Community Webinar SeriesSeries Two: All About Audio and Video Content in Repositories5-16-12 Webinar, Preserving Audio & Video Digital MediaTRANSCRIPT
Hot Topics: The DuraSpaceCommunity Webinar Series
Series Two: Managing and preserving audio and
video in your digital repository
Curated by Karen Cariani
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Using the Webinar Platform
• 2-way audio for all participants is muted
• We’ll utilize the Chat Window for the Q&A portion or you may use it if you are having technical difficulties
• You may type your question here & hit ‘enter’
Webinar 1: The Big Picture:Preserving Audio & Digital Media
Presented by: Karen Cariani,
Karen Colbron & Dave MacCarn
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
About our presenters
• Karen Cariani, Director, Media Library & Archives, WGBH Boston
• Karen Colbron, Digital Archives Manager, WGBH Boston
• Dave MacCarn, Chief Technologist, WGBH Boston
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Digital media preservation
Karen Colbron, Digital Archives Manager
Who we are: WGBH Media Library and Archives
The Analog to Digital Challenge
© 2012 WGBH
The Analog Challenge
Common (and some not so common) formats
© 2012 WGBH
• 16mm film (some 35mm)• 2” videotape• 1” videotape• 3/4” videotape• Betacam• BetamaxMII
• Digital betacam• D1, D2, D3, D4, D5• DVCam• DVCPro & DVCProHD• Mini DV & HDV
Analog migration choices
• 2” tape ------> digi-beta --------> digital file?
• 2” tape ------------------------------> digital file?
• Is the expense and capture the same?
• Capture time is double - extra pass/ step
© 2012 WGBH
Where do we go from here?
• TAPE- Condition- Machinery- Priorities
© 2012 WGBH
• BORN DIGITAL- Codecs/wrappers- Nested data- Playback- Storage
The shift from analog to digital content creation
• Before we had 1 shoot, 10 physical tapes, many shots per tape
• Now each time the camera is turned off, new file created
• Now 1 shoot, many many files for each shot
© 2012 WGBH
Who wants to be the sheriff in the wild west?
• Different formats being created all the time.• Different cameras generate different folder
structures• Creators may vary codecs within the same
camera/shoot• Keeping pace with plugins to play/capture
media
© 2012 WGBH
• Create folders by card– Assign unique
number– Continue numbers– Add description– Place ENTIRE
card contents into this folder!!
Folder Structure
Video, video, where for art thou video?
© 2012 WGBH
Finding both audio & video
© 2012 WGBH
Storage and retrieval
How do we:• Capture the audio and video generated by
myriad cameras• Store the project information to allow potential
re-edit• Store files with rich, meaningful metadata• Store born-digital materials• Display and retrieve born-digital materials
© 2012 WGBH
Open Text Artesia DAM
© 2012 WGBH
Open Text Artesia DAM
© 2012 WGBH
Video ingest tools
© 2012 WGBH
Original footage
© 2011 WGBH
Open Text Artesia DAM
© 2012 WGBH
How do we get here?
© 2012 WGBH
Proposed tapeless workflow• Create a mapping document between
filemaker and DAM• Used to generate an xml stylesheet• Video is ingested simultaneously with the
metadata from filemaker using the xml stylesheet
• Technical metadata is ingested simultaneously with the video and production data using the xml generated by the source digital files
© 2012 WGBH
That was easy, wasn’t it?
• Plug-ins to view files
• Depending on the file type we may have to re-wrap to a quicktime wrapper, or fully transcode the source file
• Redundant storage of raw and wrapped materials
• Quality of data© 2012 WGBH
We put things in. We take things out.
27 © LC-USE6-D-002716
Digital media preservation
Dave MacCarn, Chief Technoligist
From Analog to Digital to HD
• The Machine was the format.• Now the format is file containing a
codec and a wrapper.• Explosion of new formats with the
start of standard-definition digital video and an even broader array of options for high–definition recording.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
30
Lots of Data to Collect
• The Math:–1920 horizontal pixels x 1080 vertical
lines x 30fps x 3 samples/pixel x 8-10 bits/sample =
>1.2 billion bits per second.
31May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Techniques for Data Reduction:
• Resolution Sub-sampling• Video Encoding/Sampling• Video Compression
32May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
33
4:4:4
4:2:2
4:2:0
Chroma & Luma SampleNo Chroma Sample
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Video Compression
• DCT (discrete cosine transform)• Wavelet transform• MPEG• H.264 (AVC)• MPEG4 Studio Profile
34May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
35
36
37May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Containers
• AVI• DV-DIF• QuickTime• FLV• MP4• Motion JPEG2000• MXF
38May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
The Scrambling Problem
• Howard Besser – Digital Longevity–http://besser.tsoa.nyu.edu/howard/P
apers/sfs-longevity.html• Adds to the complexity of the archive.• MXF uses KLV
–The requirement of a library of Keys.
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Practice
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
• Store as few different wrappers as possible.–Rewrap if you can.
• Know your codecs.• If you need to transcode make the
product of equal or higher quality.• Watch out for encoding changes.• Know your licensing.
Questions?
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
Karen ColbronWGBH Boston
Dave MacCarnWGBH Boston
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
• DuraCloud is simple, flexible and cost effective
• DuraCloud offers expandable storage space as needed for your media files
• Streaming media services available
Solutions for Digital Media Preservation
May 16, 2012 Hot Topics: DuraSpace Community Webinar Series
• Sign up for a free 2 month trial account today www.duracloud.org
• Priced for every budget http://duracloud.org/pricing
Solutions for Digital Media Preservation