h.261 is the first practical digital video coding standard designed by itu-t to develop conference tv and video telephony on isdn. it becomes the design framework of later international standard of video coding including mpeg-1, mpeg-2/h.262 and h.263. h.261. it only deals with cif and qcif image formats by dividing every frame into images layer, acer block group layer, acer block and block layer. h.261 output rate is constant, while the image quality is unsteady.

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H.261 is the first practical digital video coding standard designed by ITU-T to develop conference TV and video telephony on ISDN. It becomes the design framework of later International Standard of Video Coding including MPEG-1, MPEG-2/H.262 and H.263. H.261. It only deals with CIF and QCIF image formats by dividing every frame into images layer, Acer block group layer, Acer block and block layer. H.261 output rate is constant, while the image quality is unsteady.