Hi ^^ Maybe i'm wrong, but it seems that the YV12 chroma down/upsampling is only a progressive one. (no interleaved chroma down/upsampling feature) Right ?? if it's right, i'll do some tests on interlaced sources interleaved down/upsampling. maybe a way to have PSNR and size improvements with interlaced sources. (very little improvements, because it's only a chroma issue) Regards, MarcFD