ROUTING MULTIMEDIA OBJECTS BASED ON INPUT FEATURE COMPATIBILITY

Abstract

Identifying the format variant of a multimedia object affects the choice of processing procedure, although the filename, declared MIME type, and initial bytes may imply incompatible interpretations. This study examines the relationship between a model of format representation admissibility, a preliminary candidate identification method, and experimental responses to conflicting input features. The model represents the sources as separate sets of possible format variants and distinguishes missing information, an unrecognized value, an established contradiction, and an approximate byte match. The method selects the candidate solely from the bytes. Metadata constrains whether processing may continue and, for the ISO BMFF family, also determines the target class. A unique route is defined with a fixed target format variant, required level, procedures, and resource limits. Route uniqueness is established for a finite candidate set and well-defined procedures. For identical bytes and target class, the operational part of the route is shown to be invariant under admissible metadata changes. The candidate remains unconfirmed until the subsequent method completes a full read. The S3 test matrix contains 60 scenarios involving a changed suffix, a conflicting declared type, or a concealed prohibited suffix, with 20 scenarios per group. All 60 scenarios resulted in the expected blocking. This result corresponds to specific model constraints and algorithmic steps but does not establish format identification accuracy in a naturally occurring file population. The proposed approach separates the byte-based grounds for selection from permission to continue and preserves candidate status in the route passed between stages. This allows signature-based or statistical identification tools to be integrated while treating their output as a preliminary conclusion that requires confirmation of the object’s structural admissibility.