If this is a file you are trying to create or optimize, here is what those specs usually represent: pixels (Standard HD).
Many sites offer "Low-Res" watermarked previews in this exact size range.
This is a common size for "Big Buck Bunny" or "Jellyfish" test files used to check if a media player is working correctly.
To give you the most helpful "feature" or breakdown, I need to know your goal. Are you trying to:
At a standard "web-friendly" bitrate of 2 Mbps, a 4.26 MB file would only be about 17 seconds long.
4.26 MB is well under the legacy 8 MB or 25 MB limits for many messaging platforms, making it an ideal "transfer-friendly" size.
If this is a technical requirement for a website or app upload, I can give you the exact bitrates needed to hit that target. Technical Breakdown (The "Feature" Specs)