High level syntax for video coding and decoding

A method of decoding video data from a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein each slice may include one or more tiles,

• wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, and the decoding comprises:
• parsing one or more syntax elements, and
• in a case where a picture includes multiple tiles, omitting the parsing of a syntax element indicating a number of tiles in the slice if a syntax element is parsed that indicates that the picture header is signalled in the slice header;
• and
• decoding said bitstream using said syntax elements.

A method of encoding video data into a bitstream, the bitstream comprising the video data corresponding to one or more slices, wherein each slice may include one or more tiles,

• wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding one or more slices, and a slice header comprising syntax elements to be used when encoding a slice, and the encoding comprises:
• determining one or more syntax elements for encoding the video data, and
• in a case where a picture includes multiple tiles, omitting the encoding of a syntax element indicating an address of a slice if a syntax element indicates that a picture header is signalled in the slice header;
• and
• encoding said video data using said syntax elements.

A method of encoding video data into a bitstream, the bitstream comprising video data corresponding to one or more slices, wherein each slice may include one or more tiles,

• wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding one or more slices, and a slice header comprising syntax elements to be used when decoding a slice, and the encoding comprises:
• determining one or more syntax elements for encoding the video data, and
• in a case where a picture includes multiple tiles, omitting the encoding of a syntax element indicating a number of tiles in the slice if a syntax element is determined for encoding that indicates that the picture header is signalled in the slice header;
• and
• encoding said video data using said syntax elements.

A method of encoding video data into a bitstream, the bitstream comprising the video data corresponding to one or more slices, wherein each slice may include one or more tiles,

• wherein the bitstream comprises a picture header comprising syntax elements to be used when decoding one or more slices, and a slice header comprising syntax elements to be used when encoding a slice, said bitstream being constrained so that
• in a case where the bitstream includes a syntax element having a value indicating that a picture includes multiple tiles and the bitstream includes a syntax element indicates that a picture header is signalled in the slice header, the bitstream also includes a syntax element indicating that a syntax element indicating an address
• of a slice is not to be parsed;
• the method comprising encoding said video data using said syntax elements.