A video picture decoding method, comprising: parsing a first indicator from a bitstream; parsing a second indicator from the bitstream if the first indicator indicates that a skip mode is used for inter prediction of a current picture block; and parsing a third indicator from the bitstream if the second indicator indicates that a merge mode with motion vector difference MMVD is not used for inter prediction of the current picture block, wherein if the third indicator is a first value, it indicates that a triangle prediction unit mode is allowed to be used for inter prediction of the current picture block; and if the third indicator is a second value, it indicates that a triangle prediction unit mode is not allowed to be used for inter prediction of the current picture block; and performing inter prediction on the current picture block based on an inter prediction mode indicated by indicator information in the bitstream, wherein the indicator information comprises the first indicator, the second indicator, and the third indicator; wherein the performing inter prediction on the current picture block based on an inter prediction mode indicated by indicator information in the bitstream comprises: if the third indicator is the first value, allowing to perform inter prediction on the current picture block based on the triangle prediction unit mode; and if the third indicator is the second value, allowing to perform inter prediction on the current picture block based on the skip mode. parsing a first indicator from a bitstream; parsing a second indicator from the bitstream if the first indicator indicates that a skip mode is used for inter prediction of a current picture block; and parsing a third indicator from the bitstream if the second indicator indicates that a merge mode with motion vector difference MMVD is not used for inter prediction of the current picture block, wherein if the third indicator is a first value, it indicates that a triangle prediction unit mode is allowed to be used for inter prediction of the current picture block; and if the third indicator is a second value, it indicates that a triangle prediction unit mode is not allowed to be used for inter prediction of the current picture block; and performing inter prediction on the current picture block based on an inter prediction mode indicated by indicator information in the bitstream, wherein the indicator information comprises the first indicator, the second indicator, and the third indicator; wherein the performing inter prediction on the current picture block based on an inter prediction mode indicated by indicator information in the bitstream comprises: if the third indicator is the first value, allowing to perform inter prediction on the current picture block based on the triangle prediction unit mode; and if the third indicator is the second value, allowing to perform inter prediction on the current picture block based on the skip mode. if the third indicator is the first value, allowing to perform inter prediction on the current picture block based on the triangle prediction unit mode; and if the third indicator is the second value, allowing to perform inter prediction on the current picture block based on the skip mode.