VIDEO PROCESSING FRAME SYNCHRONISATION
These markers are used to determine the frame drops, inserts and repeats, as well as the end of the group of frames at which point all necessary message bits are available for RA decoder. Therefore, we can detect the valid frames with higher probability. Using the sequential frame index information, the robustness increases. Furthermore, RA code spreads the output code words of the adjacent frame indices; hence, errors are less likely to occur when decoding adjacent frame indices.
A data structure of length is kept for channel observation probability values. The structure is initialized with erasures. At each frame, frame synchronization markers are decoded first. Message decoding is performed once the end of the Group of frames is detected.