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Conch
Conformance checking for media files Jerome Martinez and David Rice MediaArea.net
Conch Conformance checking for media files Jerome Martinez and - - PowerPoint PPT Presentation
Conch Conformance checking for media files Jerome Martinez and - - PowerPoint PPT Presentation
Conch Conformance checking for media files Jerome Martinez and David Rice MediaArea.net About MediaArea As a National Library incorporating the National Screen and Sound Archive of Wales, we have to preserve digital audiovisual material in
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ʺAs a National Library incorporating the National Screen and Sound Archive of Wales, we have to preserve digital audiovisual material in perpetuity. Part of this work is characterising AV files and extracting technical metadata. We found no better tool at this job than MediaInfo, and the support and response from MediaArea SARL has always been excellent.ʺ
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Key players: Conch Team
Jerome Martinez, Lead/Developer Dave Rice, Lead/Project Management Guillaume Roques, Developer Tessa Fallon, Research & Development: Standarization Ashley Blewer, Research & Development: Design Erik Piil, Research & Development: File Formats
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Key players: Advisors
Format advisors Institutional advisors Standardization advisors
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The PREFORMA Challenge
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Conformance Checker
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Status of formats
MKV FFV1 LPCM
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Standardization
IETF
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Implementation
How to label and test a bitstream Several layers: transport, container, stream
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Implementation checker
MKV: EBMLMaxSizeLength limit, DocTypeVersion, CRC‑ 32... FFV1: Missing header, colorspace_type, bits_per_raw_sample, crc_parity... Container/Stream cross‑check: PCM block duration and bitrate, MKV/FFV1 width...
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Policy checker
Must be BWF: container format must be WAV, audio format must be PCM, sampleRate must be 48000 or 44100, ... Custom policy check, e.g. PREFORMA: container format must be MKV, video format must be FFV1, audio format must be PCM... Very detailed check: MKV version, FFV1 version and micro_version, color space, bit depth, CRC‑32 presence...
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Reporter
Input: analysis of the file, policies, options Computer readable Output: XML, JSON... Human readable Output: HTML, PDF...
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Metadata Fixer
Add CRC, coherency between container and stream Embed additional metadata Warning: not all is possible
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Standardization of expression format for policy checks
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MKV and Archives
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User Interface Coverage
Command Line ‑ Checker
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User Interface Coverage
Graphic User Interface ‑ Checker
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User Interface Coverage
Graphic User Interface ‑ Checker Debug
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User Interface Coverage
Graphic User Interface ‑ Fixer
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User Interface Coverage
Graphic User Interface ‑ Policy Checker
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User Interface Coverage
Web Interface
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Automation
Periodical checks Detection of new files
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Database side
Configuration Analysis of the files Policies
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The Core
Interaction between all other elements
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Optimization priorities
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Data Exchange
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OAIS
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OAIS workflows
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Outreach/Community
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Involvement, stakeholders, and the open source community
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Development Approach
Github Agile development Stipended collaboratives Community involvement
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Development Approach
Cross platform Multiple developer interfaces (bindings) Multiple end user interfaces
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Support, new feature requests
Future Plans
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Integration of other MediaAreaʹs products
MediaArea Plans
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Integration & Community
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