The various competitors are making a range of claims about audio quality and compression efficiency.

A codec listening test is a scientific study designed to compare two or more lossy audio codecs, usually with respect to perceived fidelity or compression efficiency.

When images can be accurately synthesised from previously transmitted/stored images, the compression efficiency can be improved.

The effect on compression efficiency was noticeable, but so was the effect on complexity of the engine.

Smart encoders can monitor the compression efficiency and clear the table whenever the existing table no longer matches the input well.

The O-mode aims to maximize compression efficiency and sparse usage of the feedback channel.

The LASeR requirements included compression efficiency, code and memory footprint.

While the best frame for this purpose is usually the previous frame, the extra reference frames can improve compression efficiency and/or video quality.

This significantly improved both the compression efficiency and visual quality of the resulting video.

The reasons are probably the comparingly high complexity of codec development, the loss of some compression efficiency as well as the caused transmission overhead.