An encoder system for generating a video stream for a streaming client, the encoder system comprising: - a communication interface to the streaming client; - an input interface for accessing the video which is to be streamed to the streaming client; and - a processor configured to: via the communication interface, provide a video stream to the streaming client; characterized in that the processor is further configured to: via the communication interface, obtain signaling data from the streaming client which is indicative of a part of the video which is or would be occluded by another video or a computer-graphics based object during display of the video by the streaming client; determine the part of the video based on the signaling data, wherein the signaling data indicates at least one spatial segment of which the video data is or would be occluded during display; and generate the video stream as a spatially segmented encoding of the video comprising independently decodable segments by, before or as part of encoding of the video, omitting the part of the video by omitting to encode, and/or omitting to stream, and/or omitting to include in a manifest file, spatial segments which represent the part of the video to be omitted. - a communication interface to the streaming client; - an input interface for accessing the video which is to be streamed to the streaming client; and - a processor configured to: via the communication interface, provide a video stream to the streaming client; characterized in that the processor is further configured to: via the communication interface, obtain signaling data from the streaming client which is indicative of a part of the video which is or would be occluded by another video or a computer-graphics based object during display of the video by the streaming client; determine the part of the video based on the signaling data, wherein the signaling data indicates at least one spatial segment of which the video data is or would be occluded during display; and generate the video stream as a spatially segmented encoding of the video comprising independently decodable segments by, before or as part of encoding of the video, omitting the part of the video by omitting to encode, and/or omitting to stream, and/or omitting to include in a manifest file, spatial segments which represent the part of the video to be omitted. via the communication interface, obtain signaling data from the streaming client which is indicative of a part of the video which is or would be occluded by another video or a computer-graphics based object during display of the video by the streaming client; determine the part of the video based on the signaling data, wherein the signaling data indicates at least one spatial segment of which the video data is or would be occluded during display; and generate the video stream as a spatially segmented encoding of the video comprising independently decodable segments by, before or as part of encoding of the video, omitting the part of the video by omitting to encode, and/or omitting to stream, and/or omitting to include in a manifest file, spatial segments which represent the part of the video to be omitted.