A processor system configured for generating a composite video stream (365, 400) for transmission to a client device, the processor system comprising: - a network interface to a network; - an input interface for obtaining: - a non-volumetric video; and - a volumetric video at least part of which is to be displayed by the client device in front of the non-volumetric video; - characterised by a processor configured to: - determine a spatial subregion of the non-volumetric video which is partially or entirely occluded when the volumetric video is displayed by the client device in front of the non-volumetric video; and - generate a composite video for the client device by, for respective input frames of the non-volumetric video and the volumetric video: - obtaining a non-volumetric representation of the volumetric video which is generated using a conversion technique which allows the volumetric video to be reconstructed from the non-volumetric representation; - replacing data of the spatial subregion of the non-volumetric video by data of the non-volumetric representation of the volumetric video, thereby obtaining an output frame of the composite video; and via the network interface: - stream the composite video as a composite video stream, or stream select spatial segments of the composite video stream, to the client device; and - provide signaling data to the client device which is indicative of the composite video stream containing the non-volumetric representation of the volumetric video. - a network interface to a network; - an input interface for obtaining: - a non-volumetric video; and - a volumetric video at least part of which is to be displayed by the client device in front of the non-volumetric video; - a non-volumetric video; and - a volumetric video at least part of which is to be displayed by the client device in front of the non-volumetric video; - characterised by a processor configured to: - determine a spatial subregion of the non-volumetric video which is partially or entirely occluded when the volumetric video is displayed by the client device in front of the non-volumetric video; and - generate a composite video for the client device by, for respective input frames of the non-volumetric video and the volumetric video: - obtaining a non-volumetric representation of the volumetric video which is generated using a conversion technique which allows the volumetric video to be reconstructed from the non-volumetric representation; - replacing data of the spatial subregion of the non-volumetric video by data of the non-volumetric representation of the volumetric video, thereby obtaining an output frame of the composite video; and via the network interface: - stream the composite video as a composite video stream, or stream select spatial segments of the composite video stream, to the client device; and - provide signaling data to the client device which is indicative of the composite video stream containing the non-volumetric representation of the volumetric video. - determine a spatial subregion of the non-volumetric video which is partially or entirely occluded when the volumetric video is displayed by the client device in front of the non-volumetric video; and - generate a composite video for the client device by, for respective input frames of the non-volumetric video and the volumetric video: - obtaining a non-volumetric representation of the volumetric video which is generated using a conversion technique which allows the volumetric video to be reconstructed from the non-volumetric representation; - replacing data of the spatial subregion of the non-volumetric video by data of the non-volumetric representation of the volumetric video, thereby obtaining an output frame of the composite video; and via the network interface: - stream the composite video as a composite video stream, or stream select spatial segments of the composite video stream, to the client device; and - provide signaling data to the client device which is indicative of the composite video stream containing the non-volumetric representation of the volumetric video. - obtaining a non-volumetric representation of the volumetric video which is generated using a conversion technique which allows the volumetric video to be reconstructed from the non-volumetric representation; - replacing data of the spatial subregion of the non-volumetric video by data of the non-volumetric representation of the volumetric video, thereby obtaining an output frame of the composite video; - stream the composite video as a composite video stream, or stream select spatial segments of the composite video stream, to the client device; and - provide signaling data to the client device which is indicative of the composite video stream containing the non-volumetric representation of the volumetric video.