CTU

A CTU, or Coding Tree Unit, is a fundamental building block used in video compression standards like HEVC (High Efficiency Video Coding). Think of it as a small, flexible square section of a video frame that the encoder divides to efficiently analyze and compress. By adjusting the size and details within each CTU, the compression algorithm can better capture important visual information while reducing file size. This process helps deliver high-quality video streams at lower bitrates, making streaming, broadcasting, and storage more efficient without significantly sacrificing image clarity.