A method for transmitting a video signal from a video source system to a video sink system via a video signal communication path, comprising: the video source system receiving a source video signal comprising (a) reference code values and (b) a plurality of mapping function parameters for one or more mapping functions, the one or more mapping functions with the plurality of mapping function parameters to be applied by the video sink system to map the reference code values to device-specific pixel values; the video source system combining (a) one or more portions of the reference code values and (b) the plurality of mapping function parameters into one or more first video frames in a first video signal format, wherein at least a portion of display management, DM, metadata is embedded in the one or more first video frames in the first video signal format, the plurality of mapping function parameters representing said at least one portion of the DM metadata; the video source system signaling the video sink system which transmission mode among a first mode and a second mode is being used respectively corresponding to whether the video signal communication path does or does not support transportingthe video signal, in the first video signal format; if the video signal communication path does not support transporting the video signal in the first video signal format: the video source system mapping color channels of the first video signal in the first video signal format into a second video signal in a second video signal format different from the first video signal format based on a mapping between the first video signal format and the second video signal format, thereby generating one or more second video frames in the second video signal format based on the mapping and the one or more first video frames in the first video signal format in which said at least one portion of the DM metadata is embedded; and the video source system sending to the video sink system via the video signal communication path, the one or more second video frames in an encoded video signal of the second video signal format; if the video signal communication path does support transporting the video signal in the first video signal format: the video source system sending to the video sink system via the video signal communication path, the one or more first video frames in an encoded video signal of the first video signal format. the video source system receiving a source video signal comprising (a) reference code values and (b) a plurality of mapping function parameters for one or more mapping functions, the one or more mapping functions with the plurality of mapping function parameters to be applied by the video sink system to map the reference code values to device-specific pixel values; the video source system combining (a) one or more portions of the reference code values and (b) the plurality of mapping function parameters into one or more first video frames in a first video signal format, wherein at least a portion of display management, DM, metadata is embedded in the one or more first video frames in the first video signal format, the plurality of mapping function parameters representing said at least one portion of the DM metadata; the video source system signaling the video sink system which transmission mode among a first mode and a second mode is being used respectively corresponding to whether the video signal communication path does or does not support transportingthe video signal, in the first video signal format; if the video signal communication path does not support transporting the video signal in the first video signal format: the video source system mapping color channels of the first video signal in the first video signal format into a second video signal in a second video signal format different from the first video signal format based on a mapping between the first video signal format and the second video signal format, thereby generating one or more second video frames in the second video signal format based on the mapping and the one or more first video frames in the first video signal format in which said at least one portion of the DM metadata is embedded; and the video source system sending to the video sink system via the video signal communication path, the one or more second video frames in an encoded video signal of the second video signal format; the video source system mapping color channels of the first video signal in the first video signal format into a second video signal in a second video signal format different from the first video signal format based on a mapping between the first video signal format and the second video signal format, the video source system sending to the video sink system via the video signal communication path, the one or more second video frames in an encoded video signal of the second video signal format; if the video signal communication path does support transporting the video signal in the first video signal format: the video source system sending to the video sink system via the video signal communication path, the one or more first video frames in an encoded video signal of the first video signal format. the video source system sending to the video sink system via the video signal communication path, the one or more first video frames in an encoded video signal of the first video signal format.