[PDF] H/MPEG-4 AVC Video Compression Tutorial to contain and isolate the motion as shown in the diagram “H.264 Motion Estimation – Superior Motion Estimation”. Then, motion vectors to previous and/or future pictures are used to predict a given block. H.264/MPEG-4 AVC introduces smaller block sizes, greater flexibility in block shapes, and greater precision in motion vectors. My Technical Articles . . .: H - Overview Sep 02, 2010The block diagram for H.264 codec is shown in Figure 1. The Encoder [Figure 1(a)] includes two dataflow paths, a "forward" path (left to right, shown in blue) and a "reconstruction" path (right to left, shown in magenta).