Signaling general constraints information in method for decoding video, method: for encoding video, and non-transitory computer-readable medium

A non-transitory computer-readable medium having program code that is stored thereon, the program code executable by one or more processing devices for performing operations comprising:

• extracting a general constraints information (GCI) flag from a bitstream of the video;
• determining that one or more general constraints are imposed for the video based on a value of the GCI flag;
• in response to determining that one or more general constraints are imposed for the video, extracting, from the bitstream of the video, a value indicating a quantity of additional bits included in the bitstream of the video, the additional bits comprising flag bits indicating respective additional coding tools to be constrained for the video;
• determining that the value is no greater than 5;
• and
• in response to determining that the value is no greater than 5,
• extracting one or more bits from the bitstream, wherein a number of the one or more bits equals to the value, and
• decoding a remaining portion of the bitstream of the video into images independent of the one or more bits.

A method for encoding a video, performed by a video encoder, the method comprising:

• determining a general constraints information (GCI) flag;
• determining that one or more general constraints are imposed for the video based on a value of the GCI flag;
• in response to determining that one or more general constraints are imposed for the video, determining a value indicating a quantity of additional bits, the additional bits comprising flag bits indicating respective additional coding tools to be constrained for the video;
• determining that the value is no greater than 5;
• and
• in response to determining that the value is no greater than 5,
• determining one or more bits, wherein a number of the one or more bits equals to the value, and
• encoding the GCI flag, the value, and the one or more bits into a bitstream of the video, wherein a remaining portion of the bitstream of the video is independent of the one or more bits.