If you are actually referring to a generic , the most "useful features" include:
: It provides a specific set of procedures and test sequences to verify that bitstreams (video/audio data) and decoders meet official requirements. 38184mp4
: It defines "System Decoder" capabilities, ensuring the hardware or software can handle specific bit rates and sampling modes without crashing or lagging. If you are actually referring to a generic
: By using this standard, developers ensure that a video file created on one system will play correctly on another (e.g., a set-top box, a computer, or a smartphone). a set-top box
