Recording medium, playback device, recording device, playback method and recording method for recording progressive pictures at high frame rate

A playback device comprising:

• a reading unit configured to read an index table from a recording medium;
• a current number register storing a current title number which is a title number of a current title;
• an execution unit configured to execute a control program which is indicated in the index table as corresponding to the current title;
• and
• a playback unit configured to play back a video stream selected from a plurality of video streams as instructed by the execution unit, in accordance with one of a plurality of playback paths defined in playlist information,
• wherein the plurality of video streams include a video stream composed of progressive pictures and a video stream composed of interlace pictures, and the video stream composed of the progressive pictures has a mandatory rate or an optional rate,
• the mandatory rate is a frame rate at which any playback device can decode and play back the progressive pictures, and the optional rate is a frame rate at which a limited types of playback devices can decode and play back the progressive pictures,
• the control program instructs the playback device to play back one of the plurality of video streams in accordance with one of a plurality of playback paths defined in a plurality of pieces of playlist information,
• the index table indicates one-to-one correspondence between a plurality of titles and the plurality of control programs, the plurality of titles including a first play title and a top menu title, and
• among the plurality of control programs, control programs corresponding to the first play title and the top menu title exclude a progressive-optional-rate playback path from a playback target, the progressive-optional-rate playback path being a playback path for playing back the progressive pictures in the video stream at the optional rate.

A recording device comprising:

• an encoder configured to obtain a plurality of digital streams respectively including a plurality of video streams by performing an encoding process;
• a generating unit configured to generate a plurality of pieces of playlist information corresponding to the plurality of digital streams, a plurality of control programs, and an index table;
• and
• a writing unit configured to write the plurality of digital streams, the plurality of pieces of playlist information, the plurality of control programs, and the index table onto a recording medium,
• wherein the plurality of video streams include a video stream composed of progressive pictures and a video stream composed of interlace pictures, and the video stream composed of the progressive pictures has a mandatory rate or an optional rate,
• the mandatory rate is a frame rate at which any playback device can decode and play back the progressive pictures, and the optional rate is a frame rate at which a limited types of playback devices can decode and play back the progressive pictures,
• each of a plurality of control programs instructs the playback device to play back one of the plurality of video streams in accordance with one of the plurality of playback paths defined in the plurality of pieces of playlist information,
• the index table indicates one-to-one correspondence between a plurality of titles and the plurality of control programs, the plurality of titles including a first play title and a top menu title, and
• among the plurality of control programs, control programs corresponding to the first play title and the top menu title exclude a progressive-optional-rate playback path from a playback target, the progressive-optional-rate playback path being a playback path for playing back the progressive pictures in the video stream at the optional rate.