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
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. 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. This typically happens when a user re-saves an
Are you trying to with a file named 9700, or MKV vs MP4: Choosing the Right Streaming Format in 2026 Instead, it looks like a technical byproduct of
Adobe's Guide to MKV explains why people use MKV for archiving and MP4 for sharing.
FastPix has a detailed 2026 comparison on when to use each container for streaming versus storage.