MPEG-4
MPEG-4 is the successor to MPEG-2, which saw the introduction of the AVC (Advanced Video Codec)and enhancement of the AAC (Advanced Audio Codec), improvements which enable audio and video streams to be compressed into half the required bandwidth of MPEG-2 whilst maintaining the same level of quality. Like the improvements made between MPEG-1 and MPEG-2, this reduction in bandwidth is at the expense of increased CPU activity.