Video data decoding apparatus and method and video signal reproduction apparatus and method

A video data decoding method comprising:

• supplying video data which has been compressed by utilizing a time correlation over a plurality of frames, in units that each comprise video data of a plurality of frames;
• intermittently selecting the units supplied according to unit search information indicating time information between units from unit management information contained in said units;
• counting intermittence intervals of said supplied units so as to obtain an average time of said intermittence intervals;
• creating video data by spreading the first n I-pictures (Intra Coded Picture) or P-pictures (Predictive Coded Picture) within said units intermittently selected, n being an integer;
• and
• outputting video data of said n I-pictures or P-pictures which have been spread, on a frame by frame basis, at an interval of said average time multiplied by 1/n.

A video signal reproduction apparatus for reproducing video data which has been compressed by utilizing a time correlation over a plurality of frames, said apparatus comprising:

• decoding means supplied with said video data in units each comprising video data of a plurality of frames, for spreading said compressed video data to create video data which is outputted from said decoding means;
• and
• control means supplied with unit management information, contained within said units, containing unit search information indicating time information between units, for controlling the units supplied to said decoding means according to said unit search information,
• wherein said control means intermittently supplies the units to said decoding means and counts intermittence intervals between said intermittently supplied units to obtain an average time of said intermittence intervals, and said decoding means spreads data of the first n I-pictures (Intra Coded Picture) or P-pictures (Predictive Coded Picture) of each intermittently supplied unit, n being an integer so as to generate spread video data of said n I- or P-pictures and output the spread video data of said n I-pictures or P-pictures frame by frame at an interval of said average time multiplied by 1/n.

A video signal reproduction method for reproducing video data which has been compressed by utilizing a time correlation over a plurality of frames, said method comprising:

• supplying said video data in units each comprising video data of a plurality of frames;
• intermittently selecting the units supplied according to unit search information indicating time information between units from unit management information contained in said units;
• counting intermittence intervals of said supplied units to obtain an average time of the intermittence intervals;
• creating video data by spreading the first n I-pictures (Intra Coded Picture) or P-pictures (Predictive Coded Picture) within said units intermittently selected, n being an integer;
• and
• outputting video data of said n I-pictures or P-pictures which have been spread, on a frame by frame basis, at an interval of said average time multiplied by 1/n.