Some research repositories use "21422" as a file ID for supplementary video material (e.g., in biological studies regarding ArcGIS data or zebrafish motility).
In the Opera Browser development changelogs, DNA-21422 refers to a specific task for creating internal browser tools ( opera:browserjs ). 21422mp4
While the multimedia systems paper is the primary match, the string "21422" also appears in unrelated technical contexts: Some research repositories use "21422" as a file
Structural basis of μ-opioid receptor targeting by a nanobody ... - PMC 21422mp4
A versatile digital multimedia container format primarily used to store video, audio, subtitles, and images.
In academic and technical databases, "21422" often serves as a unique paper ID or file reference: