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
Sites like CloudConvert or FreeConvert provide easy web-based tools to fix these files without needing to learn video editing. If you are an OBS user, the OBS
Are you trying to with a file named 9700, or MKV vs MP4: Choosing the Right Streaming Format in 2026 Are you trying to with a file named
Adobe's Guide to MKV explains why people use MKV for archiving and MP4 for sharing.
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.