A digital video camera comprising: a first image sensor configured to capture image frames of a first video stream; a second image sensor configured to capture image frames of a second video stream; a first encoder configured to encode image data of the image frames of the first video stream, wherein each image frame of the first video stream is encoded into first encoded data comprising, as seen in an image frame representation, a plurality of rows (R11-R15) wherein each row has a height of a single coding unit and a width equal to a width of the image frame and is encoded as one or more slices; a second encoder configured to encode image data of the image frames of the second video stream, wherein each image frame of the second video stream is encoded into second encoded data comprising, as seen in an image frame representation, a plurality of rows (R21-R25) wherein each row has a height of a single coding unit and a width equal to a width of the image frame and is encoded as one or more slices; a data combining unit configured to combine first encoded data of an image frame of the first video stream and second encoded data of an image frame of the second video stream into combined encoded data corresponding to a single combined image frame by, as seen in a bit stream representation, interleaving rows of the first encoded data of the image frame of the first video stream and rows of the second encoded data of the image frame of the second video stream wherein each row of the single combined image frame has a height of a single coding unit and a width equal to a total width of the first and second image frames and comprises one single row of the first image frame and one single row of the second image frame, wherein the combined image frame is generated by decoding the combined encoded data by a single decoder; characterised in that the data combining unit is further configured to check if two or more directly subsequent slices in the combined encoded data comprises only skip encoded coding units, and if so replacing the two or more directly subsequent slices comprising only skip encoded coding units with a new slice comprising skip encoded coding units having a length of the two or more directly subsequent slices comprising only skip encoded coding units. a first image sensor configured to capture image frames of a first video stream; a second image sensor configured to capture image frames of a second video stream; a first encoder configured to encode image data of the image frames of the first video stream, wherein each image frame of the first video stream is encoded into first encoded data comprising, as seen in an image frame representation, a plurality of rows (R11-R15) wherein each row has a height of a single coding unit and a width equal to a width of the image frame and is encoded as one or more slices; a second encoder configured to encode image data of the image frames of the second video stream, wherein each image frame of the second video stream is encoded into second encoded data comprising, as seen in an image frame representation, a plurality of rows (R21-R25) wherein each row has a height of a single coding unit and a width equal to a width of the image frame and is encoded as one or more slices; a data combining unit configured to combine first encoded data of an image frame of the first video stream and second encoded data of an image frame of the second video stream into combined encoded data corresponding to a single combined image frame by, as seen in a bit stream representation, interleaving rows of the first encoded data of the image frame of the first video stream and rows of the second encoded data of the image frame of the second video stream wherein each row of the single combined image frame has a height of a single coding unit and a width equal to a total width of the first and second image frames and comprises one single row of the first image frame and one single row of the second image frame, wherein the combined image frame is generated by decoding the combined encoded data by a single decoder; characterised in that the data combining unit is further configured to check if two or more directly subsequent slices in the combined encoded data comprises only skip encoded coding units, and if so replacing the two or more directly subsequent slices comprising only skip encoded coding units with a new slice comprising skip encoded coding units having a length of the two or more directly subsequent slices comprising only skip encoded coding units.