Abstract: Amendment to the Abstract: Disclosed are an in-place supervision method and apparatus suitable for overhead transmission line maintenance operation, the method includes: geographic coordinate information of an overhead transmission line is, written into a risk management and control master station system of the whole electric power operation process, and an in-place supervision algorithm is written into the risk management and control master station system of the whole electric power operation process; geodetic coordinates A of a maintenance operation site and geodetic coordinates B of a supervisor are read; a distance is solved based on an elliptic spherical arc length approximate chord length algorithm; whether the distance S exceeds a threshold value of out of supervision or not is judged.

Abstract: A decoding method includes obtaining an identifier from a bitstream, where the identifier indicates a minimum decoding time interval k between library pictures that is allowed in the bitstream, obtaining, when parsing the bitstream, a decoding moment ti of a current decoded picture and a decoding moment tj of a first decoded picture that is closest to the current decoded picture and that references a new library picture when the current decoded picture is decoded by referencing a library picture, where the new library picture is a library picture that is not decoded or needs to be re-decoded when the first decoded picture is decoded, and determining a preset quantity of library pictures as candidate reference pictures of the current decoded picture based on a relationship between k and a difference between ti and tj.

Abstract: A decoding method includes obtaining an identifier from a bitstream, where the identifier indicates a minimum decoding time interval k between library pictures that is allowed in the bitstream, obtaining, when parsing the bitstream, a decoding moment ti of a current decoded picture and a decoding moment tj of a first decoded picture that is closest to the current decoded picture and that references a new library picture when the current decoded picture is decoded by referencing a library picture, where the new library picture is a library picture that is not decoded or needs to be re-decoded when the first decoded picture is decoded, and determining a preset quantity of library pictures as candidate reference pictures of the current decoded picture based on a relationship between k and a difference between ti and tj.