: This is the video codec (High Efficiency Video Coding). It allows the file to be much smaller in size while keeping the quality high, but it requires more processing power to play.
: The audio format (Advanced Audio Coding), which provides clear, standard stereo or multi-channel sound.
: If the video laggy, your device’s processor might be struggling with the x265 compression. Try closing other apps or using "Hardware Acceleration" in your player settings.