A data generation device comprising: a generating circuit configured to generate video data according to an Advanced Video Coding, AVC, standard and a second opto-electrical transfer function, OETF, which supports a second range of an input intensity of light; and a storage to store: video usability information, VUI, including a first value indicating a first OETF; and supplemental enhancement information, SEI, including a second value indicating the second OETF, wherein VUI and SEI are included in the video data; wherein the first OETF supports a first range of an input intensity of light and the second range is wider than the first range; the first value is to be referred to by a decoding device that does not support the second OETF, when the decoding device decodes the video data; and the second OETF has compatibility with the first OETF; wherein the first OETF is an OETF defined in one of BT. 709 and BT. 2020; and the SEI is in an IRAP NAL unit or an I-picture; wherein the first range and the second range correspond to a first luminance range and a second luminance range, respectively, and the second luminance range is wider than the first luminance range. a generating circuit configured to generate video data according to an Advanced Video Coding, AVC, standard and a second opto-electrical transfer function, OETF, which supports a second range of an input intensity of light; and a storage to store: video usability information, VUI, including a first value indicating a first OETF; and supplemental enhancement information, SEI, including a second value indicating the second OETF, wherein VUI and SEI are included in the video data; wherein the first OETF supports a first range of an input intensity of light and the second range is wider than the first range; the first value is to be referred to by a decoding device that does not support the second OETF, when the decoding device decodes the video data; and the second OETF has compatibility with the first OETF; wherein the first OETF is an OETF defined in one of BT. 709 and BT. 2020; and the SEI is in an IRAP NAL unit or an I-picture; wherein the first range and the second range correspond to a first luminance range and a second luminance range, respectively, and the second luminance range is wider than the first luminance range. video usability information, VUI, including a first value indicating a first OETF; and supplemental enhancement information, SEI, including a second value indicating the second OETF, wherein VUI and SEI are included in the video data; wherein the first OETF supports a first range of an input intensity of light and the second range is wider than the first range; the first value is to be referred to by a decoding device that does not support the second OETF, when the decoding device decodes the video data; and the second OETF has compatibility with the first OETF; wherein the first OETF is an OETF defined in one of BT. 709 and BT. 2020; and the SEI is in an IRAP NAL unit or an I-picture; wherein the first range and the second range correspond to a first luminance range and a second luminance range, respectively, and the second luminance range is wider than the first luminance range.