Decoding method, encoding method, and related device

Abstract

Embodiments of this application provide a decoding method. The method includes: obtaining a bitstream of a first coding unit, where the first coding unit is at least one coding unit in a plurality of coding units; determining an end decrease step, wherein the end decrease step is used to update a virtual padding amount of the plurality of coding units; determining the virtual padding amount of the plurality of coding units based on the end decrease step, where the virtual padding amount is used to reduce storage space of a buffer in a decoding device; determining that an encoding mode of the first coding unit in the plurality of coding units is a fallback mode; and decoding the bitstream of the first coding unit based on the virtual padding amount and the fallback mode, to obtain first data. In an encoding/decoding process, the virtual padding amount is considered in the fallback mode, in other words, encoding/decoding is performed based on the virtual padding amount and the fallback mode, and the virtual padding amount may be used to reduce the storage space of the buffer. This reduces buffer overflow in the encoding/decoding process in the fallback mode.