Motion Picture Film Median Derivative - HD MP4 50Mbps [MPD-D4]
|Record Type||Digital Moving Images from Film-based Source Material|
|Expected Use||Distribution Copy|
|Product Name||Motion Picture Film Median Derivative - HD MP4 50Mbps [MPD-D4]|
The purpose of this product is to respond to reference and reproduction requests for exhibits, libraries and other special requests.
|Nature of Source Material||
This product is created from HD AVI or other reproduction master files.
|File Properties||Data Format||
Target Total Bitrate: ~50.4Mbps
Typical file size: ~350MB/minute or ~21GB/hour
|Possible File Derivatives||
This product is used to make distribution files.
Quality Assurance and Quality Control for Digital Imaging Products
The Digitization Services Branch’s Quality Assurance and Quality Control (QA/QA) program is evolving as new tools and resources are acquired and implemented. We are moving towards more automated and integrated systems to assure the products we make meet the specifications outlined. Digital products created by the Digitization Services Branch are validated against standardized format specifications and signature files when possible. We use a variety of format specific batch evaluation and validation tools both open source and vendor supplied, to assure technical quality level specifications are met. All files, but especially distribution system specific files, are inspected for successful playback in a variety of tools and environments. Additional quality control workflows are in development.
NARA is developing an in house job tracking order system to better coordinate work at the Branch level.
Item Level Evaluation: Automated File Characteristics Analysis