For modern systems, tools like ffprobe (from FFmpeg) can identify the FourCC or component type of a track. Example:
Because it is a container, a .mov file created on one computer may not play on another if the second computer lacks the specific codec used inside that container. quicktime extension
Another: . QuickTime 3.0 introduced sprites—interactive, vector-like graphics that could change over time, respond to mouse clicks, and play sounds. Entire games and interactive CD-ROMs were built using QuickTime’s sprite tracks, each managed by a dedicated extension. For modern systems, tools like ffprobe (from FFmpeg)