Video decoding device and video decoding method

A decoding device for decoding an encoded bit stream which is generated by encoding video in units of pictures based on a predetermined encoding standard, the decoding device comprising:

• a processor;
• and
• a non-transitory memory having a program stored therein, which when executed, causes the processor to perform:
• acquiring video format information indicating whether the video is encoded with a video format among an interlace format of the predetermined encoding standard or a progressive format of the predetermined encoding standard, from a header of a sequence which is a unit of the video;
• (i) setting each of all frames or all fields which are included in the video, as a picture included in the video, regardless of whether the video format is the interlace format of the predetermined encoding standard or the progressive format of the predetermined encoding standard, and (ii) setting a Picture Order Count (POC) indicating display order to each of the pictures included in the video one by one, the POC being different each other;
• decoding a picture to be decoded, from among the pictures included in the video, with reference to a picture previously decoded before decoding the picture to be decoded, the picture to be decoded being a field or a frame;
• and
• outputting the picture to be decoded, wherein
• in the decoding, picture data of the picture to be decoded is always decoded with a syntax structure, which is a common syntax structure for decoding video format of the predetermined encoding standard regardless of whether the video format is the interlace format of the predetermined encoding standard or the progressive format of the predetermined encoding standard, and
• the decoding includes decoding a top field and a bottom field belonging to the same frame continually in the decoding order, when the video format is the interlace format of the predetermined encoding standard.