A video data processing method performed between a source device and a sink device, the method comprising: transmitting, by the sink device, display information indicating capabilities of the sink device to the source device via an interface, wherein the display information is carried in Consumer Electronics Association, CEA, data block with a specific tag code that indicates the CEA data block carries the display information, wherein the display information includes first electro optical transfer function, EOTF, type information for identifying an EOTF supported by the sink device; receiving, by the source device, the display information from the sink device; decoding and processing the video to be displayed using an EOTF into image information suitable for the sink device to optimally view the video content based on the display information received from the sink device, transmitting, by the source device, decoded video data and dynamic range mastering information including dynamic range related information of the decoded video data to the sink device via the interface, wherein the dynamic range mastering information includes second EOTF type information for identifying the EOTF used in the decoded video data, wherein the dynamic range mastering information includes information on container color gamut characteristics for displaying the decoded video data, wherein the EOTF identified by the first EOTF type information indicates a relationship between a digital signal value provided to the sink device and a brightness value of a display of the sink device, wherein the dynamic range mastering information is carried in a data structure for sending information from the source device to the sink device, wherein the data structure includes a type code identifying that the data structure carries the dynamic range mastering information; receiving, by the sink device, the decoded video data and the dynamic range mastering information; transforming, by the sink device, the digital signal value of the received video data to a brightness value according to the EOTF identified by the second EOTF type information; and playing, by the sink device, the received video data back, wherein the display is controlled according to the brightness value. transmitting, by the sink device, display information indicating capabilities of the sink device to the source device via an interface, wherein the display information is carried in Consumer Electronics Association, CEA, data block with a specific tag code that indicates the CEA data block carries the display information, wherein the display information includes first electro optical transfer function, EOTF, type information for identifying an EOTF supported by the sink device; receiving, by the source device, the display information from the sink device; decoding and processing the video to be displayed using an EOTF into image information suitable for the sink device to optimally view the video content based on the display information received from the sink device, transmitting, by the source device, decoded video data and dynamic range mastering information including dynamic range related information of the decoded video data to the sink device via the interface, wherein the dynamic range mastering information includes second EOTF type information for identifying the EOTF used in the decoded video data, wherein the dynamic range mastering information includes information on container color gamut characteristics for displaying the decoded video data, wherein the EOTF identified by the first EOTF type information indicates a relationship between a digital signal value provided to the sink device and a brightness value of a display of the sink device, wherein the dynamic range mastering information is carried in a data structure for sending information from the source device to the sink device, wherein the data structure includes a type code identifying that the data structure carries the dynamic range mastering information; receiving, by the sink device, the decoded video data and the dynamic range mastering information; transforming, by the sink device, the digital signal value of the received video data to a brightness value according to the EOTF identified by the second EOTF type information; and playing, by the sink device, the received video data back, wherein the display is controlled according to the brightness value.