c++rtsp转flv ffmpeg

C++ RTSP转FLV FFMpeg是一个可以将RTSP流转换为FLV格式的工具，它使用FFmpeg库来实现。FFmpeg是一个开源的多媒体处理库，支持多种音视频编解码器，可以用于处理音频、视频和流媒体数据。

使用C++ RTSP转FLV FFMpeg可以将RTSP流转换为FLV格式，这对于在互联网上流式传输视频非常有用。通过使用FFmpeg，您可以轻松地将RTSP流转换为适合在Web浏览器中播放的FLV格式，从而轻松地在网络上分发视频内容。

要使用C++ RTSP转FLV FFMpeg，您需要安装FFmpeg库并将其包含在您的项目中。您可以使用CMake等构建工具来管理您的项目并链接FFmpeg库。

下面是一个简单的示例代码，演示如何使用C++ RTSP转FLV FFMpeg将RTSP流转换为FLV文件：

#include <iostream>
#include <string>
#include <vector>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cerrno>
#include <sys/stat.h>
#include <fcntl.h>

extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswresample/swresample.h>
}

int main(int argc, char* argv[]) {
    if (argc != 3) {
        std::cerr << "Usage: " << argv << " <input_rtsp_url> <output_file>" << std::endl;
        return 1;
    }

    std::string input_rtsp_url = argv;
    std::string output_file = argv;

    // Open input file for reading
    int input_fd = open(input_rtsp_url.c_str(), O_RDONLY);
    if (input_fd == -1) {
        std::cerr << "Failed to open input file: " << input_rtsp_url << std::endl;
        return 1;
    }

    // Open output file for writing
    int output_fd = open(output_file.c_str(), O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
    if (output_fd == -1) {
        std::cerr << "Failed to open output file: " << output_file << std::endl;
        close(input_fd);
        return 1;
    }

    // Create an AVFormatContext for the output file
    AVFormatContext* format_context = NULL;
    avformat_alloc_output_context2(&format_context, NULL, "flv", output_file.c_str());
    if (!format_context) {
        std::cerr << "Failed to create AVFormatContext" << std::endl;
        close(input_fd);
        close(output_fd);
        return 1;
    }

    // Open a demuxer for the input file and parse the stream information
    AVFormatContext* input_format_context = NULL;
    int ret = avformat_open_input(&input_format_context, input_rtsp_url.c_str(), NULL, NULL);
    if (ret < 0) {
        std::cerr << "Failed to open input RTSP stream" << std::endl;
        avformat_free_context(format_context);
        close(input_fd);
        close(output_fd);
        return 1;
    }
    avformat_close_input(&input_format_context);

    // Set the output stream parameters and open the output file for writing the stream data to it. Also create a media writer object for writing the actual stream data to the file. This can be done in multiple threads if needed. For simplicity, we'll just use a single thread here. We also need to make sure to close the output file when we're done writing the stream data. We'll use avformat to handle this for us. This can be done by calling avformat_free() on the format context and then close() on the output file descriptor. This will also free any memory allocated for the format context and close any open files or sockets. We also need to call exit() to clean up any resources allocated by the program. For simplicity, we'll just call exit() here as well. We'll also use exit() to clean up any