A method for a server apparatus comprising: determining an intended behavior of a playback device by an apparatus, the intended behavior comprising the result of analysing a received indication associated with an intended behaviour of the playback device and a received indication associated with an observation setup that comprises one or both of an observation point and an observation orientation, wherein the observation point is indicative of a point or volume, in a three-dimensional space, of acquisition or playback of an audio and/or visual presentation, and the observation orientation is indicative of an orientation of a viewport to the audio and/or visual presentation, the viewport being a subset of the audio and/or visual presentation to be rendered on a playback device; causing a control signal to be generated for the playback device by the apparatus, wherein the control signal is associated with a rendering operation of the audio and/or visual presentation on the playback device and the control signal is indicative of the determined intended behavior of the playback device, and wherein the received indication associated with observation setup is associated with a playback mode condition in a video stream that comprises a condition indication configured to indicate for the playback device when the intended behavior is to be applied by the playback device, the condition indication is, configured to indicate that the initial observation setup applies unconditionally in a continuous playback mode of the playback device, or, as a response to a seek request from the playback device indicating a random access point, that the initial observation setup applies unconditionally in a random access mode of the playback device such that the playback device can start decoding the audiovisual presentation at the random access point, which is other than a beginning of the presentation and recover an exact or approximate reconstructed audiovisual signal, transmitting, by the apparatus, to the playback device the said control signal in the audio and/or video stream or included in a description of the audio and/or video stream. determining an intended behavior of a playback device by an apparatus, the intended behavior comprising the result of analysing a received indication associated with an intended behaviour of the playback device and a received indication associated with an observation setup that comprises one or both of an observation point and an observation orientation, wherein the observation point is indicative of a point or volume, in a three-dimensional space, of acquisition or playback of an audio and/or visual presentation, and the observation orientation is indicative of an orientation of a viewport to the audio and/or visual presentation, the viewport being a subset of the audio and/or visual presentation to be rendered on a playback device; causing a control signal to be generated for the playback device by the apparatus, wherein the control signal is associated with a rendering operation of the audio and/or visual presentation on the playback device and the control signal is indicative of the determined intended behavior of the playback device, and wherein the received indication associated with observation setup is associated with a playback mode condition in a video stream that comprises a condition indication configured to indicate for the playback device when the intended behavior is to be applied by the playback device, the condition indication is, configured to indicate that the initial observation setup applies unconditionally in a continuous playback mode of the playback device, or, as a response to a seek request from the playback device indicating a random access point, that the initial observation setup applies unconditionally in a random access mode of the playback device such that the playback device can start decoding the audiovisual presentation at the random access point, which is other than a beginning of the presentation and recover an exact or approximate reconstructed audiovisual signal, transmitting, by the apparatus, to the playback device the said control signal in the audio and/or video stream or included in a description of the audio and/or video stream.