libavformat avio_open() Function: Opening an Output URL for RTSP Streaming in C/C++

This code snippet is attempting to open an output URL using the libavformat library in C/C++. The function "avio_open" is used to open the output URL and create an "AVIOContext" for it. \n\nThe parameters passed to "avio_open" are:\n- "&rtspFormatContext->pb": A pointer to the "AVIOContext" pointer that will be created.\n- "outUrl": The output URL to open.\n- "AVIO_FLAG_WRITE": A flag indicating that the URL should be opened in write mode.\n\nThe result of the "avio_open" function is checked against "< 0" to see if it was successful. If the result is less than 0, it means there was an error opening the URL and further error handling or cleanup may be required.\n\nNote that "rtspFormatContext" is assumed to be a valid "AVFormatContext" pointer that has been initialized before this code snippet.