Motion Picture Film Maximum - Soundtrack Audio Data [MPD-P6]
|Record Type||Digital Moving Images from Film-based Source Material|
|Expected Use||Preservation Master|
|Product Name||Motion Picture Film Maximum - Soundtrack Audio Data [MPD-P6]|
The purpose of this product is to mitigate risk for loss of information. This file is at an appropriate information capture level to substitute for the original record if the original record copy is no longer viable.
|Nature of Source Material||
|File Properties||Data Format|
Typical file size: Mono: ~ 17.28 MB/minute or 1 GB/hour; Stereo: 134.5 MB/minute or 2 GB/hour
|Possible File Derivatives||
The audio data in this product is is integrated with DPX image data for reproduction masters and distribution copies.
Quality Control for Digital Audio Files
Using automated batch-processing software tools, test plans are developed for each format and/or each appropriate project. The test plan allows for some characteristics to be evaluated on an actionable basis (warning, fail or pass depending on the defined parameters). Others are logged for internal use but are not actionable as a warning, pass or fail. Aim points for these benchmarks are evaluated against NARA's product specifications as well as NARA defined aim points which may change depending on specific project goals. The following represents the quality test plan technical characteristics for WAV and MP3 products.
Item Level Evaluation: Automated Quality Analysis
Fixity: NARA is evaluating workflows to create and validate checksums for each digital file.
Terms used in the QC protocols are defined in the Glossary of Terms.
For digital products created from film-based source material, the specifications are dictated by the source material’s original characteristics including format and condition. A separate WAV file is created for all at risk stand alone sound elements as identified on the At Risk Assessment Guide.