Video: MPEG-1 (1.5 Mbps), MPEG-2 (40 Mbps), MPEG-4 (Kbps)
Others: Real-Video, QuickTime
Audio: mp3: MPEG-1, Layer III, 44.1 kHz, 128 Kbps
DVD's: MPEG-2, high quality
3 related problems: Bandwidth, delay and packet loss
We need to compress, making the media more sensible to information loss
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