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DIGITAL PRESERVATIONFOR PUBLIC BROADCASTING
Rebecca FraimowNational Digital Stewardship Resident, WGBH
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Introduction
Risks
File identification
File fixity
Metadata
Format recommendations
Storage
Tools
NDSR
Q&A
WHY DIGITAL PRESERVATION?
RISKS TO DIGITAL FILES
LACK OF IDENTIFICATIONFILE CORRUPTION
STORAGE MEDIA FAILURESOFTWARE OBSOLESCENCEHARDWARE OBSOLESCENCE
FILE IDENTIFICATION
robot.movhigh quality master
robot.movlow-quality proxy
robot.movclip from Terminator
FILE IDENTIFICATION: OPTIONS
FILE NAMING CONVENTIONS
Sample: FR_05182015_robots_M_01(department + date + program + purpose + ID)
FILE IDENTIFICATION: OPTIONS
FILE NAMING:
Include recognizable and relevant identifiersInclude dates
Use sequential numbering for version controlUse leading zeros to make sure files sort in sequential order
FILE IDENTIFICATION: OPTIONS
FILE NAMING:
include characters other than letters, numbers and underscoresuse spaces in between sections of the identifier
make file names so long they become problematic for softwareuse the same name for two different versions of a file
FILE IDENTIFICATION: OPTIONS
Unique Identifier/GUID/UUID
Sample: 516b0360-b272-4005-b312-748542972f96
FILE IDENTIFICATION: OPTIONS
Checksum
VERIFYING FILES
METADATAExternal
sidecar file databasespreadsheet
METADATAEmbedded
METADATA MANAGEMENT
KEY METADATA
Unique IDChecksum/Fixity Information
Copyright InformationSource
ProgramDescription
Storage locationDate
LocationFormat/codec/wrapper
Technical specs
KEY METADATA
Technical specs
Aspect ratioFrame rate
Bit rateSample rate
Bit depthColor space
Progressive/Interlaced
TECHNICAL RECOMMENDATIONSAnalog-to-Digital
PRESERVATION FILEcodecs: 10-bit uncompressed v210, JPEG2000, FFV1
color space: YUVchroma subsampling: 4:2:2
aspect ratio: preserve original (for video, usually 4:3) wrappers: .mov, .avi
audio: 48 kHz/24-bit PCM
PRODUCTION MASTERScodecs: ProRes, DV50, high-quality H.264
check with production staff what they find easiest to work with
ACCESS FILEshould be suitable for web playback or streaming
can be digital or physical (DVD)codecs: low-quality H.264, MPEG-2
Born Digital
TECHNICAL CONSIDERATIONS
What formats can you support and play back?
What do your production teams use?
How much storage space do you have?
How confident do you feel mapping important characteristics between formats?
Can you preserve metadata when transcoding?
How much computer time/staff time will it take to transcode?
What do you really need to keep?
STORAGE
MORE OPEN-SOURCE TOOLS
YOUR QUESTIONS
How can you get producers onboard early in the workflow?
How do you create metadata for older media when proper documentation doesn’t exist?
How do you manage the volume with a very small staff?
NATIONAL DIGITALSTEWARDSHIP RESIDENCY
FOR
PUBLIC BROADCASTING
AAPB NDSR
TIMELINE
Applications: Summer 2016Residency: October 2016-July 2017
AAPB NDSR
POTENTIAL PROJECTS
Digitization and digital migration Workflow design
Standards developmentMetadata management
Tool/DAM research and testing
AAPB NDSR
ADVANTAGES FOR STATIONS
One year of additional archives-focused staffLink into professional PB /archival network
Final deliverable designed for long-term station benefit
