Bjontegaard Delta-Rate Metric
Comparing video compression efficiency
A video encoder can be configured in many ways: different GOP (Group of Pictures) structure, different quantization parameters (QP) or target bitrate, motion compensation range, etc. Furthermore, different encoders likely produce different compressed streams. Depending on the encoder and the configuration the same source video is compressed differently, each having its own bitrate and distortion value. Bjontegaard Delta-Rate (BD Rate) metric can be used to compare and choose the encoder or configuration, that provides the best compression results.