Method for output layer set mode in multilayered video stream

A non-transitory computer-readable storage medium storing instructions that, when executed, cause a system or device comprising one or more processors to:

• receive a bitstream comprising compressed video/image data, wherein the bitstream has multiple layers;
• parse or derive, from the bitstream, an output layer set mode indicator in a video parameter set (VPS);
• identify output layer set signaling based on the output layer set mode indicator;
• identify one or more picture output layers based on the identified output layer set signaling;
• and
• decode the identified one or more picture output layers, the decoding including:
• setting, based on each layer being an output layer set, a picture output flag of the VPS equal to a picture output flag signaled in a picture header, regardless of the value of the output layer set mode indicator, or
• setting the picture output flag of the VPS equal to 0 based on a sequence parameter set (SPS) identifier of the VPS being greater than 0, the each layer is an output layer set flag being equal to 0, and the output layer set mode indicator being equal to 2.

An apparatus comprising:

• at least one memory configured to store computer program code;
• and
• at least one processor configured to access the at least one memory and operate according to the computer program code, the computer program code comprising:
• receiving code configured to cause the at least one processor to receive a bitstream comprising compressed video/image data, wherein the bitstream has multiple layers;
• parsing or deriving code configured to cause the at least one processor to parse or derive, from the bitstream, an output layer set mode indicator in a video parameter set (VPS);
• output layer signaling identifying code configured to cause the at least one processor to identify output layer set signaling based on the output layer set mode indicator;
• picture output layer identifying code configured to cause the at least one processor to identify one or more picture output layers based on the identified output layer set signaling;
• and
• decoding code configured to cause the at least one processor to:
• decode the identified one or more picture output layers,
• wherein the decoding code is configured to cause the at least one processor to:
• set, based on each layer being an output layer set, a picture output flag of the VPS equal to a picture output flag signaled in a picture header, regardless of the value of the output layer set mode indicator, or
• set the picture output flag of the VPS equal to 0 based on a sequence parameter set (SPS) identifier of the VPS being greater than 0, the each layer is an output layer set flag being equal to 0, and the output layer set mode indicator being equal to 2.