avformat_alloc_output_context2

avformat_alloc_output_context2 is a function in the FFmpeg library that is used to allocate and initialize an output format context for a given output format. This function takes two arguments: a pointer to the output format context that will be allocated and initialized, and a pointer to the output format that will be used.

The output format context is a structure that holds information about the output format, such as the codec, bitrate, and other settings. The output format is a structure that defines the format of the output data, such as MP4, AVI, or MPEG.

This function is typically used when creating a new output file or stream. It allocates and initializes the output format context based on the specified output format, and returns a pointer to the context. Once the context is allocated, the application can set various encoding parameters and then call avformat_write_header() to begin writing data to the output file or stream.

Overall, avformat_alloc_output_context2 is an important function in the FFmpeg library that allows developers to create and initialize an output format context for various multimedia applications.