# Extracting DCT coefficients from H.264/AVC bitstream

Is it possible to extract DCT coefficients from H.264/AVC bitstream without doing a full-decoding of the video?

There are a lot of papers on compressed domain video processing which are based on the assumption that DCT coefficients can be extracted through partial decoding and thus a lower computational complexity and faster than real time decoding can be achieved by using the DCT coefficients for various computer vision tasks (e.g. tracking, action recognition). However, nobody really describes the exact process of such partial decoding, and I seriously doubt it can be achieved with the recent video codecs such as H.264/AVC or H.265/HEVC. Does anybody have an insight on this one?