If you are an OBS user, the OBS Project Forum has extensive posts on "remuxing" recordings so they don't break if your computer crashes.
FastPix has a detailed 2026 comparison on when to use each container for streaming versus storage. 9700.mkv.mp4
The specific filename doesn't point to a single viral meme or a specific "official" blog post. Instead, it looks like a technical byproduct of remuxing or converting a video file—likely a recording from OBS (Open Broadcaster Software) or a rip from a Blu-ray. If you are an OBS user, the OBS
Adobe's Guide to MKV explains why people use MKV for archiving and MP4 for sharing. Instead, it looks like a technical byproduct of
This typically happens when a user re-saves an MKV file (a high-quality "container" that holds multiple audio/subtitle tracks) as an MP4 (a more widely compatible format) without removing the original extension. Key Resources for Video Conversion