5 16-12 curated series #2 presentation

Hot Topics: The DuraSpace Community Webinar Series Series Two: Managing and preserving audio and video in your digital repository Curated by Karen CarianiMay 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 MacCarnMay 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 BostonMay 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 Challenge

Common (and some not so common) formats• 16mm film (some 35mm) • Digital betacam• 2” videotape • D1, D2, D3, D4, D5• 1” videotape • DVCam• 3/4” videotape • DVCPro & DVCProHD• Betacam • Mini DV & HDV• BetamaxMII© 2012 WGBH

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

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

Folder Structure • Create folders by card – Assign unique number – Continue numbers – Add description – Place ENTIRE card contents into this folder!!

Storage and retrievalHow 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

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 rewrap 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 preservationDave 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

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.May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 31

Techniques for Data Reduction:• Resolution Sub-sampling• Video Encoding/Sampling• Video CompressionMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series 32

Chroma & Luma Sample No Chroma Sample 4:4:4 4:2:2 4:2:0May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 33

Video Compression• DCT (discrete cosine transform)• Wavelet transform• MPEG• H.264 (AVC)• MPEG4 Studio ProfileMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series 34

May 16, 2012 Hot Topics: DuraSpace Community Webinar Series 37

Containers• AVI• DV-DIF• QuickTime• FLV• MP4• Motion JPEG2000• MXFMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series 38

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• 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.May 16, 2012 Hot Topics: DuraSpace Community Webinar Series

Questions? Karen Colbron WGBH Boston Karen_colbron@wgbh.org Dave MacCarn WGBH Boston Dave_maccarn@wgbh.orgMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series

Solutions for Digital Media Preservation• DuraCloud is simple, flexible and cost effective• DuraCloud offers expandable storage space as needed for your media files• Streaming media services availableMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series

Solutions for Digital Media Preservation • Sign up for a free 2 month trial account today www.duracloud.org • Priced for every budget http://duracloud.org/pricingMay 16, 2012 Hot Topics: DuraSpace Community Webinar Series

5 16-12 curated series #2 presentation

by DuraSpace on May 16, 2012

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