VIDEO CODING AND DECODING DEVICES AND METHODS AND SYSTEMS THEREOF

Disclosed are Video coding and decoding devices, methods and system thereof, in which the video coding device comprises a video coder for performing video coding on a frame including a plurality of macroblocks by a predefined coding technique so as to output a normal coded stream and for outputting a prediction error value for each of the macroblocks obtained through inter-frame movement prediction, a grading means for grading the macroblocks based on the prediction error values and allocating redundant bit to macroblocks at respective grades, a redundant coder for generating redundant information indicated by corresponding redundant bit for each of the graded macroblock, and a merger means for merging said normal coded stream and said redundant information to generate a final coded stream. With the configuration of the present invention, bit rate will not be increased significantly with content transmission quality being guaranteed.