The .mp4 container (using H.264 or H.265/HEVC codecs) is standard for sharing, though at 2000fps, the file bitrate must be very high to avoid "ghosting" or "smearing" artifacts caused by the resampling process.
In a "2000fps" context, resampling usually means the software has calculated new, "in-between" frames to make a standard clip look like it was filmed in ultra-slow motion.
If captured natively, this would require a specialized high-speed camera (like a Phantom).
The name suggests a high-end video processing workflow, likely involving high-speed photography or AI-driven frame interpolation.
To see the actual encoding settings, use a tool like MediaInfo or FFmpeg to verify if the file is truly 2000fps or if that is just the descriptive name.
This indicates the video has undergone . This is the process of changing the frame rate while attempting to maintain smooth motion.