H.26L is the next generation of video coding standard

it aims at higher coding efficiency and is developed by ITU-T and MPEG as a long-term standard. Some complicated techniques

such as spatial prediction in intra coding

integer cosine transformation (ICT)

adaptive block size motion compensation

Adaptive Motion Accuracy (AMA)

multiple reference frame prediction

universal variable length coding and content adaptive binary arithmetic coding (CABAC)

these coding modes all use the H.26L standard. In order to estimate each method' s contributes to the performance

detailed simulation and analysis are provided in this paper. Simulation results show that CABAC can provide a fairly consistent improvement in coding efficiency of between 5% and 10%. How much coding gains that can be achieved by using multiple reference frame prediction highly depend on source content. As for the benefit of eighth-pixel motion estimation accuracy

we find it is only beneficial at high resolutions and high bit rates

and also contain high spatial detail. Finally

the use of different block sizes also provides a consistent improvement

averaging 16% bit savings if all block types are used versus using the 16×16 mode only. However

using 8×8 and larger blocks can capture most of the benefit of the different block sizes

although the smaller blocks become more beneficial as the bit rate is increased. These results will help people to perform further improvements and optimization to the algorithm.