prospects and challenges of migrating to digital moving image archives r. justin davila co-inventor,...
TRANSCRIPT
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Prospects and Challenges of Migrating to Digital Moving Image ArchivesR. Justin DavilaCo-Inventor, SAMMA Systemand Consultant,Media Matters LLC
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Focus on Motion JPEG2000
PastDigital Video Preservation Format
PresentReal-Time Lossless-Compressed Audio-
Video Encoding Prototype Future
From Prototype to Production
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PAST: In Search of Real-Time Lossless Compression
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Goals of SAMMA
System for the Automated Migration of Media AssetsLarge Scale Media Migration Projects
Higher Productivity Lower Cost Higher Quality
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Missing Links
Custom Tape Inspector-Cleaner: Physical Tape
Custom TBC: Analog Signal
Archive File Format: Preservation and Access
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Digital Video Preservation Reformatting Project Researched for the Dance Heritage
CoalitionElizabeth Aldridge
Executive Director Jim Lindner,
Principal Investigator Justin Dávila
Senior Researcher
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Digital Format Requirements Quality Usability Preservation
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Digital Format Requirements Quality
Measurable Factors Resolution Luminanace Chrominance Loss of Data in Compression
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Digital Format Requirements Usability
Editable (Production-Friendly)Stills/Freeze FrameMetadata (Information about the Item)High Resolution (HDTV)
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Digital Format Requirements Preservation
Long Term SupportPermanent AccessNo Proprietary EquipmentOpen Standard
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All Paths Lead to Motion JPEG2000 Lossless Compression No Interframe Compression Access File Scalability Open Standard
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File Wrappers
Materials eXchange Format (MXF)Production-FriendlyDefines data structure for audio and
video material (essence) plus associated descriptive and structural Metadata
Workable subset of larger AAF wrapper format
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PRESENT: Demo of Motion JPEG2000 Real-Time Audio-Video Encoder Prototype
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Prototype Card
Prototype useful for demonstrating internally and to select customers.
Production card being farmed out to board manufacturers.
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Features
Uses Analog Devices ADV202 JPEG2000 Compression Chips
Encodes Standard SDI component video into compressed JPEG2000 Stream. Encodes AES digital audio into standard BWF file.
Decodes using a second chip for pass through into standard 525i/625i component video and AES audio out.
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Demo Limitations
Vertical Blanking in SDIADV202 requires long blanking for 525i
Audio SyncConstant A/V sync delay (approx .25
sec) requires adjustment Both issues exist only in this
prototype board and will be resolved in production model
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DEMO
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Overview
Hardware EncodeADV202(JP2) + BWF
Software DecodeBWF
Hardware DecodeADV202(JP2) + BWF
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FUTURE: From Prototype to Production and the Holistic View
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Video
ADV202 – “raw”JP2J2C
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Audio
BWF: 4 Gigabytes4 Ch @ 24bits/ch = 124 Minutes2 Ch @ 24bits/ch = 248 Minutes4 Ch @ 16bits/ch = 186 Minutes2 Ch @ 16bits/ch = 372 Minutes
Extended BWF, RF64No Limits
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Audio-Video
JP2(or J2C).bin + BWF.wav =
MJ2.avi(or MJ2.mj2c)
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Metadata
Media Matters Metadata (MMM.xml)(LoC METS-Friendly)Descriptive MetadataTechnical Metadata Digital Provenance Metadata
From SAMMA Reporting Devices: Tape Inspector-Cleaner Time Base Corrector Video Analyst Audio Analyst
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Wrapped Metadata
MJ2.avi + MMM.xml=
MXF.mxf
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MXF Storyboard