If this is from a specific textbook, software, or scientific study, please share: The (e.g., Biology, Programming, Engineering).
Combine images and clips into an MP4 using tools like Adobe Express or Clideo . : 3b (113).mp4
If you are trying to create or extract a feature from a video file, here are the most likely methods: : Use Online-Convert to change formats. If this is from a specific textbook, software,
Use a shell script to generate thumbnails for a directory of MP4s. : or scientific study
: Supplement files for academic papers (e.g., Supplementary Video 3b or Fig 3B animations).