Motion Picture Film HD MP4 (Custom Bitrate) [MPD-D4]
Record Type: Digital Output from Motion Picture Film Source
Expected Use: Distribution Copy
Product Name: Motion Picture Film HD MP4 (Custom Bitrate) [MPD-D4]
Product Purpose: The purpose of this product is to respond to reference and reproduction requests for exhibits, Presidential Libraries, and special projects. It is not retained after delivery.
Nature of Source Material: This product is created from any 4K ProRes 4444 MOV (QuickTime File Format), HD (High Definition) AVI (Audio Video Interleaved), or MP4 reproduction master video file from film-based source material.
Possible File Derivatives: Derivatives are not made from this product category.
File Properties
| Container Format |
|---|
|
MP4 File Format (MPEG-4 Part 14) |
| File Specifications |
|
Target Total Bitrate: Project dependent
Audio Data
Typical file size: Project dependent |
Quality Control
Quality Assurance and Quality Control for Distribution Copy Video Files
The National Archives and Records Administration (NARA) uses a commercially available, automated batch processing software tool to evaluate specific quality metrics for files created directly from film captures (see MPD-R1 and MPD-R2). The MP4 derivative described here is sourced from a4K MOV, HD AVI, or MP4 reproduction master file following the NARA Film Reference standard operating procedure (SOP). We rely on visual quality control (QC) and spot checks to confirm completeness and accuracy of slates, as well as technical characteristics of the files. If an MP4 does not meet specified requirements, a new file is created from the source.
Metadata
The MP4 filename contains metadata that associates the file with external sources of descriptive and technical metadata. Each filename is a unique identifier composed of the item’s record group, series, item number, and reel number. To distinguish this file from the 50Mbps HD MP4 distribution master, a suffix identifying the bit rate is appended to the filename (ex. 255-hq-199-r2_15Mbps.mp4).
Rationale
Sometimes internal customers require an HD MP4 product with a different bitrate from other described MP4 distribution copies. In such cases a derivative file with the needed bitrate may be created, though it is not retained after delivery.