Video Online Delivery - SD MP4 [VID-D1]

Record Type: Digital Moving Images from Video Source Material

Expected Use: Distribution Copy

Product Name: Video Online Delivery - SD MP4 [VID-D1]

Product Purpose: This product is primarily used for online delivery through the National Archives Catalog. Product is also served as a reference copy on site in National Archives and Records Administration  (NARA) research rooms.

Nature of Source Material: Any digital reproduction master file.

Possible File Derivatives: None

Other Information: Previously, the Audio-Video Preservation Lab created Windows Media (WMV) files for the National Archives Catalog.

File Properties

Container Format


File Specifications

Target Total Bitrate: ~2.1 Mbps

Video data:

  • Video frame size: 720 x 480 non-square pixels
  • Aspect ratio: 4:3
  • Video codec: Advanced Video Codec (avc1)
  • Video bitrate: ~2.0 Mbps
  • Video mode: VBR
  • Video frame rate: 60fps Main Profile @ Level 3.1
  • Progressive 
  • Single-pass encoding

Audio data:

  • Audio channels: 2 (stereo L R)
  • Audio bitrate: 192 Kbps
  • Audio mode: CBR
  • Audio codec: Advanced Audio Codec (AAC)
  • Audio sample rate: 48 kHz

Typical file size: ~15.67 MB/minute or .940 GB/hour

Quality Control

Quality Assurance and Quality Control for Distribution Copy Video Products

The Audio-Video Lab relies on visual and auditory quality control (QC) and spot checks to confirm completeness and technical characteristics of the files.


The file name contains metadata that associates the file with external sources of descriptive and technical metadata. Each file name is a unique identifier composed of the item’s record group, series, and item number.