{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp06_four_proposal_generalization60_20260803","cell_id":"representation_independent_interface_contract__film_media_production","arm":"COMPLETE_PROPOSAL_PORTFOLIO","candidate_id":"ricc_fmp_04_media_essence_access_contract","proposal_index":4,"version":0,"title":"Frame-Accurate Media Essence Access Contract","problem":"A film-production pipeline may identify and access media through filesystem paths, container layouts, codec-specific libraries, filename frame numbers, storage URLs, database rows, or cache keys. Review, rendering, visual-effects, sound, and conform clients then depend on those representations. Relocating an asset, losslessly rewrapping it, changing storage backends, rechunking it, or replacing a decoder can consequently change frame addressing, audio-channel order, boundary behavior, errors, or returned content even when the underlying media essence is intended to remain unchanged.","actors":["Media manager","Assistant editor","Visual-effects I/O operator","Colorist","Sound editor","Rendering pipeline engineer","Media asset-management engineer","Storage administrator","Post-production supervisor","Information-security representative"],"observable_state":"On copied test media, client code opens concrete paths or URLs, parses filename numbers, selects container tracks by position, reads codec-library objects, or inspects cache manifests. Representation-only changes such as relocation, renaming, lossless rewrapping, internal chunk reordering, cache eviction, or backend substitution can change which frame or sample is returned, channel labeling, interval boundaries, retry behavior, or errors. Two backends can claim to hold the same asset version while producing different contract-level observations.","consequence":"Clients cannot determine through one shared oracle whether a storage, packaging, or decoding replacement preserves the intended media essence. Representation changes can require application-specific repair or deliver unintended frames, samples, or channels to downstream work.","affected_objective":"Provide immutable, frame- and sample-accurate access to approved media essence across storage, packaging, and decoding substitutions without requiring clients to understand those internal representations.","intervention":"Define an opaque MediaEssence component whose public meaning is an immutable, versioned sequence of audiovisual observations rather than a file. Its operations resolve a semantic asset and version, describe declared properties, read a picture frame by an abstract rational-time or frame coordinate, read an audio sample interval by sample coordinate, enumerate semantic channel roles, stream a bounded interval, request a declared rendition profile, verify returned provenance, report availability, and close a session. Model the abstract state as a semantic asset identity, immutable version, media kind, rational time domain, ordered picture frames or audio samples, channel roles, declared color or audio interpretation, approved rendition relations, availability state, and lineage. Require deterministic repeated reads of a frozen version; monotonic coordinates; exact declared interval boundaries; equivalence between a whole read and the ordered concatenation of valid subreads; stable semantic channel roles; explicit gaps; no state mutation after rejected reads; and source immutability when a rendition is requested. Define range, unavailable, pending, unsupported-profile, integrity, access-denied, and superseded-version errors. Hide paths, URLs, containers, codecs, chunk layouts, database records, cache keys, decoder objects, and storage topology. Admit a local-file, object-store, chunked-stream, cache-backed, or other implementation as substitutable only when it passes the same black-box oracle at the declared observation level. Treat latency, throughput, decoded precision, and rendition tolerance as contractual only when explicitly included in a named access profile.","structural_mapping":[{"archetype_element":"Abstract behavioral surface","domain_realization":"MediaEssence exposes semantic resolution, property description, frame and sample reads, interval streaming, channel-role enumeration, rendition requests, provenance verification, availability, and declared errors."},{"archetype_element":"Hidden representation","domain_realization":"Files, paths, URLs, container tracks, codecs, decoder objects, chunks, storage tiers, database rows, manifests, and caches remain implementation-private."},{"archetype_element":"Abstract state model","domain_realization":"An essence is an immutable versioned sequence of picture frames or audio samples in a declared rational-time domain, with semantic channel roles, interpretation metadata, rendition relations, availability, and lineage."},{"archetype_element":"Representation invariant","domain_realization":"Every valid concrete representation maps to one semantic asset version with ordered observations, valid coordinate bounds, declared channel roles, and no concealed gaps or contradictory lineage."},{"archetype_element":"Abstraction mapping","domain_realization":"Each backend maps concrete bytes, tracks, chunks, and decoder results to the same contract-level frames, samples, coordinates, roles, and errors."},{"archetype_element":"Behavioral laws","domain_realization":"Frozen-version reads are repeatable, coordinates are monotonic, partitioned interval reads concatenate to the whole observation, and representation-only relocation or lossless repackaging does not change public results."},{"archetype_element":"Error and side-effect limits","domain_realization":"Invalid ranges, unavailable data, integrity failures, unsupported profiles, and access denial have declared outcomes; reads do not mutate essence, and rendition work may create only implementation-private derivatives or caches."},{"archetype_element":"Conformance and substitution rule","domain_realization":"One implementation-independent oracle evaluates every backend through the public surface before clients may treat it as a replacement."}],"mechanism_mapping":[{"mechanism_slug":"abstract_data_type_specification","role":"Defines media essence as an ordered abstract observation sequence and supplies the invariants and abstraction mapping that tie files, containers, chunks, and decoded buffers to that meaning.","counterfactual_removal":"Without it, the interface would describe retrieval calls but could not determine whether differently stored or packaged assets denote the same essence."},{"mechanism_slug":"design_by_contract_clause","role":"Specifies preconditions, postconditions, unchanged-state guarantees, error allocation, and side-effect limits for resolution, reads, streaming, rendition requests, and provenance checks.","counterfactual_removal":"Without operation-level clauses, backends could disagree on boundaries, gaps, partial reads, unavailable states, and failures while satisfying the same signatures."},{"mechanism_slug":"interface_definition_language","role":"Generates client and backend bindings around opaque asset handles, rational coordinates, semantic channel roles, declared profiles, observations, and typed errors.","counterfactual_removal":"Without a compiled boundary, applications could continue exchanging concrete paths, decoder types, or container records even if a prose contract existed."},{"mechanism_slug":"opaque_type_or_module_boundary","role":"Prevents ordinary clients from inspecting storage locations, container tracks, decoder objects, chunk manifests, cache keys, and backend credentials.","counterfactual_removal":"Without opacity, clients could bypass semantic operations and preserve the representation coupling the intervention is meant to remove."},{"mechanism_slug":"black_box_contract_test_suite","role":"Runs exact frame, sample, channel, interval, lifecycle, error, provenance, and immutability fixtures against every backend through public operations only.","counterfactual_removal":"Without a reusable oracle, backend substitution would be judged through application-specific playback or successful file opening rather than declared behavior."},{"mechanism_slug":"property_based_conformance_test","role":"Generates coordinate ranges and read partitions to test monotonicity, repeatability, bounds, concatenation, gap disclosure, and unchanged-state laws.","counterfactual_removal":"Without generated ranges and partitions, boundary defects and inconsistent combinations of partial reads could remain outside the hand-authored fixtures."},{"mechanism_slug":"metamorphic_behavior_test","role":"Checks that relocation, renaming, lossless rewrapping, rechunking, registration reordering, and cache eviction preserve the same contract-level observations.","counterfactual_removal":"Without representation transformations, a backend could pass fixed examples while depending accidentally on the original path, package, chunk, or cache layout."},{"mechanism_slug":"reference_implementation_differential_test","role":"Uses a deliberately simple in-memory or uncompressed model to compare exact observations with a candidate backend on the same bounded fixture.","counterfactual_removal":"Without an independent concrete oracle, the suite would rely more heavily on laws that can hold even when both the requested and returned observations are semantically wrong."},{"mechanism_slug":"representation_leakage_probe","role":"Audits handles, results, errors, timing, metadata, and diagnostics for paths, URLs, codec names, track positions, chunk identities, cache state, or storage topology not promised by the contract.","counterfactual_removal":"Without leakage probing, clients could adopt useful backend details that remain observable despite the nominal opaque boundary."},{"mechanism_slug":"semantic_versioning_and_deprecation_gate","role":"Classifies changes to coordinates, observations, profiles, errors, and side-effect promises and stages incompatible removals through explicit contract versions.","counterfactual_removal":"Without governed evolution, a backend or contract update could silently redefine observable media-access behavior and invalidate existing clients."}],"causal_chain":["Review, rendering, conform, visual-effects, and sound clients replace concrete file and decoder dependencies with opaque MediaEssence handles and operations.","The abstract state defines asset identity through immutable time-indexed observations, semantic channel roles, interpretation, and lineage rather than storage representation.","Each backend maps its files, containers, chunks, decoders, and caches to that shared abstract state.","Generated bindings and opacity prevent ordinary clients from reaching through to paths, URLs, track positions, manifests, or decoder internals.","Contract clauses make boundaries, gaps, availability, provenance, errors, and side effects consistent across implementations.","Exact fixtures, an independent simple model, generated intervals, and representation transformations provide a common conformance oracle.","Leakage audits identify observable storage details that clients could convert into unofficial dependencies.","A conforming backend can be evaluated as a substitute without changing the media-access meaning used by downstream applications."],"baseline":"Expose mounted paths, storage URLs, container files, or asset-management records to each client. Every application selects tracks, interprets frame numbers, configures decoders, handles unavailable storage, and manages caches through its own integration logic. A storage or packaging change is validated separately in each consuming application.","nearest_rivals":["Mandate one canonical codec, container, filename convention, and directory structure; this freezes a representation without defining backend-independent read behavior, errors, or substitution.","Maintain stable mounted paths or redirect old paths with links and aliases; this preserves location-shaped dependencies rather than replacing them with semantic asset operations.","Use a media asset-management catalog that returns concrete file locations; this centralizes discovery but still exposes storage and packaging details to clients.","Copy every asset into each application's preferred local working format; this avoids some shared dependencies while multiplying conversions and leaving equivalence judgments application-specific.","Write a separate storage or codec adapter inside every consuming application; this distributes translation without one common behavioral oracle.","Standardize a transfer or streaming protocol; this governs transport while leaving frame addressing, channel meaning, rendition equivalence, errors, and immutable-version behavior under-specified."],"remaining_contrastive_claim":"The proposal is a representation-independent interface contract only if immutable frame and sample observations, coordinate laws, channel roles, errors, provenance, side-effect limits, and the shared conformance oracle define MediaEssence across multiple backends. If the intervention merely replaces one path scheme, container, codec, catalog, or transfer protocol with another, the contrastive claim fails.","authority_safety":{"decision_authority":"The post-production supervisor may authorize the sandbox. The media manager must approve asset identity and immutability semantics; representatives of picture, sound, and visual-effects consumers must approve observable coordinate and channel behavior; and the information-security representative must approve handle and access-control boundaries.","authorized_first_step":"Using only duplicated, non-production test media with known picture frames and audio samples, implement a simple in-memory reference and one file-backed adapter, then run the same contract fixtures and representation transformations without routing any active application through the component.","excluded_actions":["Do not move, rename, transcode, rewrite, delete, or change permissions on production media.","Do not replace a live render, review, conform, sound, visual-effects, backup, or archival access path.","Do not embed filesystem paths, storage credentials, signed URLs, or cache keys in public handles.","Do not classify a lossy rendition as source-equivalent during the initial test.","Do not conceal missing frames, samples, channels, or integrity failures by returning placeholders as valid observations.","Do not treat conformance on the bounded fixture as authorization for production migration."],"halt_rollback":"Stop if a source artifact is modified, a read reaches an unauthorized location, a public handle leaks credentials or backend topology, an unexplained frame or sample divergence occurs, or a failed request changes abstract state. Disable the sandbox adapter and continue existing file-based access; retain only duplicated fixtures, the reference model, contract draft, and test log."},"negative_tests":{"strongest_counterevidence":"Some clients may legitimately require representation-specific properties such as codec-native packets, GPU surfaces, container metadata, exact byte layout, or storage-performance behavior. If these are necessary production obligations rather than private implementation choices, the proposed abstract surface may be incomplete or may merely relocate the coupling into named profiles.","problem_falsifier":"The hypothesized problem would be falsified if bounded inspection shows that clients already depend only on explicit semantic asset operations, representation-only relocation and lossless repackaging preserve all observations, and failures instead arise from corrupted media, incorrect metadata, missing access authorization, or genuinely different essence.","intervention_falsifier":"The intervention would be falsified if two backends pass every contract test yet deliver different frames, samples, channel meanings, or approved interpretation to a downstream client, or if ordinary clients must routinely inspect paths, containers, codecs, chunks, or decoder objects to perform their authorized work.","risks":["The abstract observation model may omit codec-native or container-level behavior required by an authorized client.","Color, transfer-function, channel-layout, or sample-format interpretation may be underspecified even when raw values match.","A simple reference model may share mistaken coordinate or boundary assumptions with the contract author.","Lossless-looking transformations may change metadata that is semantically required.","Generated interval tests may miss long-duration drift, variable-rate behavior, corruption, or concurrency failures.","Opaque handles may hinder operational diagnosis unless sanctioned read-only introspection is narrowly defined.","Clients may convert coarse timing, error differences, or handle structure into storage-topology dependencies.","Rendition profiles may become an uncontrolled escape hatch that re-exposes implementation representations.","A backend may satisfy correctness obligations while failing undeclared resource constraints needed by a production workflow."]},"next_evidence_step":"Create one bounded copied fixture with distinctive known picture-frame values, multiple labeled audio channels, a rational time base, explicit start and end boundaries, and one declared gap or unavailable interval. Before implementing the adapter, write expected observations, typed errors, provenance results, and laws for repeated reads, bounds, partition-and-concatenate equivalence, immutability, and channel-role stability. Run them against an independent in-memory model and one file-backed adapter. Then relocate and rename the copy, losslessly rewrap it, vary internal chunk boundaries, reorder internal registration, and evict the adapter cache; rerun the unchanged suite. Classify each divergence as a contract defect, model defect, adapter defect, invalid equivalence assumption, necessary representation-specific obligation, or evidence that the proposed coupling problem is absent.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Proposal 1 defined a LockedCut abstraction for the editorial meaning of post-production sequences and turnovers. Proposal 2 defined a SynchronizedTake abstraction for grouping captured picture and sound and mapping their local clocks into common take time. Proposal 3 defined a LightingCueProgram abstraction for active on-set lighting trajectories and safety-bounded control. This proposal defines immutable media-essence access across storage, packaging, decoding, and cache representations. It neither determines editorial placement, establishes correspondence between separately recorded streams, nor commands physical lighting. Its causal path runs from storage-dependent media clients through opaque frame and sample operations to substitutable read backends. It can be adopted by render, review, visual-effects, sound, or conform clients without adopting any earlier proposal. Proposal 2 could refer to media handles if both were present, but its synchronization contract does not implement this access component, and this component does not group or synchronize takes.","revision_record":{"parent_version":null,"progress_targets_addressed":["Generated a fourth complete candidate for the same archetype-domain cell.","Selected an independently adoptable problem and causal path distinct from proposals 1, 2, and 3.","Specified the abstract component, operations, state, invariants, errors, hidden representation, side effects, oracle, substitution rule, authority, safeguards, rivals, falsifiers, and bounded evidence.","Explained diversity from every earlier sealed proposal."],"conceptual_changes":["Instantiated the archetype as an immutable frame- and sample-access contract rather than an editorial, synchronization, or physical-control abstraction.","Defined files, containers, codecs, chunks, caches, and storage locations as hidden representations of time-indexed media observations.","Separated source-equivalent observations from explicitly named rendition profiles."],"operational_changes":["Restricted the first step to duplicated non-production fixtures and one file-backed sandbox adapter.","Prohibited production-media mutation, live-client routing, credential-bearing handles, and initial lossy-equivalence claims.","Added immediate rollback for unauthorized access, representation leakage, state mutation, or unexplained observation divergence."],"evidence_changes":["Specified exact known frame and sample fixtures plus an independent in-memory reference.","Combined differential, property-based, and metamorphic checks across relocation, rewrapping, rechunking, registration order, and cache state.","Defined observations that distinguish representation coupling from corruption, bad metadata, authorization failures, and genuinely different essence.","Kept prior-art status unsearched."],"claim_changes":["Made no novelty, prevalence, demand, or effect-size claim.","Conditioned substitutability on contract-level frame, sample, channel, provenance, error, and side-effect equivalence.","Explicitly distinguished the proposal from every earlier sealed candidate and from codec, container, catalog, path, and transport standardization."]}}