Video scalability is referred to that the encoded bitstream can be decoded partly and the reconstruction video quality is proportional to the amount of received information

and the spatial and temporal resolutions can be changed according to the decoder property.This paper presents a highly scalable video codec with wavelet domain motion compensation based on regular triangular mesh

which decomposes the reconstructed reference frame by RDWT

carries out motion compensation in wavelet domain by mesh-based motion model

so that the efficiency of motion compensation is improved.In order to keep not only PSNR scalability but also spatial and temporal resolution scalability

an amended SPIHT method with subbands-scan order is proposed.The experimental results prove that the codec can produce encoded stream with good PSNR and highly scalable functions.