High-level syntax for signaling neural networks within a media bitstream

A method comprising:

• receiving one or more prefix indications for a bitstream;
• parsing, from the one or more prefix indications, an initial part of an information message, wherein the information message describes one or more post-filtering operations or related information, and wherein the initial part describes one or more post-filter properties, wherein the one or more prefix indications declare the one or more post-filter properties of the bitstream so as to enable selection of the bitstream to be received or decoded;
• parsing through a media description describing the bitstream to access the one or more prefix indications, wherein the one or more prefix indications are contained in at least one of the following:
• one or more media parameters in the media description;
• or
• one or more syntax elements or one or more syntax structures in a file encapsulating the bitstream, wherein the file is accessible via the media description;
• determining, based on the declared one or more post-filter properties, one or more of the following:
• whether to fetch the bitstream;
• whether to fetch the information message;
• or
• whether to fetch a neural network referenced by the one or more post-filter properties.

An apparatus comprising at least one processor;

• and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform:
• creating one or more prefix indications in or along a bitstream;
• including, in the one or more prefix indications, an initial part of an information message, wherein the information message describes one or more post-filtering operations or related information, and wherein the initial part describes one or more post-filter properties;
• using the one or more prefix indications to declare the one or more post-filter properties of the bitstream so as to enable selection of the bitstream to be received or decoded;
• making the one or more prefix indications accessible through a media description describing the bitstream, wherein the one or more prefix indications are contained in at least one of the following:
• one or more media parameters in the media description;
• or
• one or more syntax elements or one or more syntax structures in a file encapsulating the bitstream, wherein the file is accessible via the media description.

An apparatus comprising at least one processor;

• and at least one non-transitory memory storing instructions that, with when executed by the at least one processor, cause the apparatus at least to perform:
• receiving one or more prefix indications for a bitstream;
• parsing, from the one or more prefix indications, an initial part of an information message, wherein the information message describes one or more post-filtering operations or related information, and wherein the initial part describes one or more post-filter properties, wherein the one or more prefix indications declare the one or more post-filter properties of the bitstream so as to enable selection of the bitstream to be received or decoded;
• parsing through a media description describing the bitstream to access the one or more prefix indications, wherein the one or more prefix indications are contained in at least one of the following:
• one or more media parameters in the media description;
• or
• one or more syntax elements or one or more syntax structures in a file encapsulating the bitstream, wherein the file is accessible via the media description;
• determining, based on the declared one or more post-filter properties, one or more of the following:
• whether to fetch the bitstream;
• whether to fetch the information message;
• or, or
• whether to fetch a neural network referenced by the one or more post-filter properties.