Method to encode moving picture data and apparatus therefor

A method to encode moving picture data in which the moving picture data having a plurality of frames is segmented into a group of pictures (GOP) comprising an I frame (intrapicture), a B frame (bi-directionally predicted picture), and a P frame (predicted picture) and is encoded, the method comprising:

• segmenting the moving picture data into the GOP and encoding the moving picture data;
• extracting a key frame from the moving picture data;
• determining whether a frame to be encoded is the key frame;
• terminating the GOP in a frame (previous frame) before the key frame;
• and
• starting a new GOP from the key frame when the frame to be encoded is the key frame.

A method to transcode a moving picture bit stream in units of a group of pictures (GOP) comprising an I frame (intrapicture), a B frame (bi-directionally predicted picture), and a P frame (predicted picture), the method comprising:

• decoding moving picture data from a bit stream;
• segmenting the moving picture data into the GOP and encoding the moving picture data;
• extracting a boundary between shots from the moving picture data;
• determining whether a frame to be encoded is a first frame (boundary frame) of a next shot;
• terminating GOP in a frame (previous frame) before a key frame;
• and
• starting a new GOP from the boundary frame when the frame to be encoded is the boundary frame.

A method to transcode a moving picture bit stream in units of group of pictures (GOP) comprising an I frame (intrapicture), a B frame (bi-directionally predicted picture), and a P frame (predicted picture), the method comprising:

• decoding moving picture data from a bit stream;
• segmenting the moving picture data into the GOP;
• encoding the moving picture data;
• extracting a key frame from the moving picture data;
• determining whether a frame to be encoded is the key frame;
• terminating the GOP in a frame (previous frame) before the key frame;
• and
• starting a new GOP from the key frame when the frame to be encoded is the key frame.

An apparatus to transcode a moving picture bit stream in units of a group of pictures (GOP) comprising an I frame (intrapicture), a B frame (bi-directionally predicted picture), and a P frame (predicted picture), the apparatus comprising:

• a decoder to decode moving picture data from a bit stream;
• a shot detector to detect a boundary between shots from the moving picture data and output a detection result indicative thereof;
• and
• an encoder to segment the moving picture data into the GOP, to encode the moving picture data, and to refer to the detection result to segment the GOP at the boundary between shots.