A video data processing method and/device for display adaptive video playback are disclosed. The video data processing method includes receiving video data and dynamic range mastering information including dynamic range related information of the video data from a source device via an interface, and playing the received video data back. The dynamic range mastering information includes electro optical transfer function, EOTF, type information for identifying an EOTF used for the video data.

A video data processing method and/device for display adaptive video playback are disclosed. The video data processing method includes receiving video data and dynamic range mastering information including dynamic range related information of the video data from a source device via an interface, and playing the received video data back. The dynamic range mastering information includes electro optical transfer function, EOTF, type information for identifying an EOTF used for the video data.

A method, devices, and a non-transitory recording medium for providing contents are provided. The method includes reproducing at least one content, at a first device; transmitting information corresponding to the at least one content from the first device to a second device to reproduce content corresponding to the at least one content in the second device; receiving a message from an external device while reproducing the at least one content at the first device; providing the received message while reproducing the at least one content at the first device; and transmitting information corresponding to the received message from the first device to the second device, the information corresponding to the received message being used to enable the second device to provide a message corresponding to the received message while reproducing the content corresponding to the at least one content.