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Summary Which codec offers the best compression? This is a moveable feast codecs are improving all the time. Choosing a codec depends upon many factors. First there is the audience for your streams. What players do they have installed and what speed of connection do they use? You can make tests to see what codec gives the best quality at the required bit rate. There are commercial concerns: What is the cost of an end-to-end solution? Then the producer may have a view. Does the architecture support all the rich media content that he or she may want to use? Only you can answer these questions. To recommend a codec for a specific task depends upon many factors. Codecs are often compared to existing video formats for example, VHS quality. It is difficult to sensibly compare an analog tape format with DCT compression. We quite happily watch the poor quality of VHS (compared to broadcast television) because of the constant level of artifacts like noise. The brain ignores continuing distortions. DCT-based coding produces changing levels of artifacts. This means that stationary pictures with low levels of fine detail look better than fast-moving fine detail. So the picture quality changes as the picture content changes. This is visually disturbing as the blockiness comes and goes. So it is meaningless to compare DCT coding with VHS. To achieve a constant video quality you have to resort to variable bit rate encoding, as adopted with the DVD format. That way the fast-action sequences get a higher bit rate than the stationary scenes. This is now an option with some streaming codecs. Compression will always be a trade-off between bit rate and artifacts, but the use of perceptual coding now allows for compelling viewing over broadband circuits, DSL, and cable modems, using a fraction of the bandwidth of conventional television. Video compression 101

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