: Sites like Pexels or Pixabay might offer a "test kit" for creators to check if a specific camera's "look" fits their project.

: Developers or video editors use these files to see if their NVR (Network Video Recorder) or editing suite supports specific codecs like H.265 or HEVC .

: Brands like Reolink, Dahua, or Hikvision often provide these so customers can see "real-world" performance.