Configurable nal and slice code point mechanism for stream merging

A method of video decoding comprising:

• receiving, from a video data stream, a sequence parameter set (SPS);
• parsing, from the SPS, an extra slice header bit map;
• mapping one or more bits in the extra slice header bit map to one or more flags that indicate presence or non-presence corresponding to a syntax element in a slice header;
• determining a number of extra slice header bits based on an amount of the one or more flags that indicate presence;
• and
• parsing, from the video data stream, the syntax element in the slice header based on the determined number of extra slice header bits.

A method of video encoding comprising:

• providing, via a video data stream, a sequence parameter set (SPS);
• encoding, in the SPS, an extra slice header bit map that maps one or more bits in the extra slice header bit map to one or more flags that indicate presence or non-presence corresponding to a syntax element in a slice header;
• determining a number of extra slice header bits based on an amount of the one or more flags that indicate presence;
• and
• providing, via the video data stream, the syntax element in the slice header based on the determined number of extra slice header bits.