Information recording medium, and apparatus and method for recording information to information recording medium

An information recording apparatus for encoding video information and audio information into a system stream and recording the system stream to a computer-readable medium,

• the system stream being allowed to have a first format (TS) and a second format (PS),
• the information recording apparatus comprising:
• a first encoding section operable to encode video information and audio information in a predetermined encoding manner according to the first format (TS) to generate a video elementary stream and an audio elementary stream;
• a second encoding section operable to perform system-encoding by multiplexing the video elementary stream and the audio elementary stream to generate the system stream according to the first format (TS);
• and
• a control section operable to control the first encoding section and the second encoding section, wherein
• the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to the second format (PS),
• the control section controls the first and second encoding sections so that each encoding is done according to the constrained format, and
• according to the constrained format, a presentation of the video information of continuous complete data blocks always starts at a top field and ends at a bottom field, the continuous complete data blocks being included in a continuous reference presentation time for video information and audio information, and the continuous reference presentation time including at least one data block.