Signal processing device, record/replay device, signal processing method, and program

A signal processing device that outputs a video signal to a display device, the signal processing device comprising:

• a converter that converts an input video signal into an output video signal for a low-brightness display device in which an upper limit value of a range of a displayable brightness is smaller than an upper limit value in a high-brightness display device;
• and
• a selector that receives the input video signal and the output video signal, selects one of the input video signal and the output video signal, and outputs the selected video signal to the display device,
• wherein the selector selects the output video signal in a case where a high-brightness flag indicating a video signal for the high-brightness display device is added to the input video signal, and where information indicating that the display device is the low-brightness display device is acquired or information indicating that the display device is the high-brightness display device is not acquired, and selects the input video signal in a case where the high-brightness flag is not added to the input video signal.