: In video production—particularly when using software like OBS Studio—it is a common safety practice to record in .mkv format to prevent data loss during crashes. Once the recording is finished, the software "remuxes" (repackages) the video into an .mp4 container for better compatibility with editing software. Why Use These Formats?
: A user may have manually added .mp4 to the end of a .mkv file to force a media player or website to recognize it. This does not change the internal encoding of the file and can often cause playback errors if the player does not support the original MKV container. Ding Dong 5.mkv.mp4
: The most widely compatible format for web sharing, mobile devices, and professional video editors. and professional video editors.