Online Delivery Video MP4 [VID-D1]
|Record Type||Digital Moving Images from Video Source Material|
|Expected Use||Distribution Copy|
|Product Name||Online Delivery Video MP4 [VID-D1]|
This option can be used when the file is expected to be used primarily in an online access capacity such as through ARC.
|Nature of Source Material||
Any digital reproduction master file from video source material.
|File Properties||Data Format||
Target Total Bitrate: ~2.1 Mbps
Typical file size: ~15.67 MB/minute or .940 GB/hour
|Possible File Derivatives||
Previously, the Video Preservation Lab created Windows Media (WMV) files for ARC/OPA.
Audio and video levels may be adjusted as appropriate during the initial capture process but otherwise, the preservation files are unaltered. Reproduction and distribution files may have additional image improvements such as minimal color correction if necessary.
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