Are you trying to with a file named 9700, or MKV vs MP4: Choosing the Right Streaming Format in 2026

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.

Sites like CloudConvert or FreeConvert provide easy web-based tools to fix these files without needing to learn video editing.

If you are looking for a "good blog post" on this topic, it is usually found in discussions about to make high-quality video files compatible with social media or mobile devices. Why you see "mkv.mp4"