c++ rtmp推流代码

以下是使用ffmpeg进行rtmp推流的C++代码示例：

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <unistd.h>
#include <sys/wait.h>

using namespace std;

int main(int argc, char *argv[]) {
    string rtmpUrl = "rtmp://example.com/live/stream"; // RTMP推流地址
    string videoDevice = "/dev/video0"; // 视频设备
    string audioDevice = "hw:0,0"; // 音频设备

    // 构造ffmpeg命令
    string cmd = "ffmpeg -f v4l2 -i " + videoDevice + " -f alsa -i " + audioDevice + " -vcodec libx264 -preset ultrafast -acodec aac -f flv " + rtmpUrl;

    // 转换为C字符串
    char *cmdStr = new char[cmd.length() + 1];
    strcpy(cmdStr, cmd.c_str());

    // 创建子进程
    pid_t pid = fork();

    if (pid == -1) {
        cerr << "Failed to fork" << endl;
        exit(1);
    } else if (pid == 0) {
        // 子进程执行ffmpeg命令
        system(cmdStr);
        exit(0);
    } else {
        // 父进程等待子进程结束
        int status;
        waitpid(pid, &status, 0);
    }

    delete[] cmdStr;

    return 0;
}

该代码使用了ffmpeg库进行rtmp推流，需要在编译时链接ffmpeg库。具体的CMakeLists.txt文件如下：

cmake_minimum_required(VERSION 3.5)

project(rtmp_push)

set(CMAKE_CXX_STANDARD 11)

find_package(Threads REQUIRED)

# ffmpeg库路径
set(FFMPEG_LIB_DIR /usr/local/lib)

# 头文件路径
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)

# 链接库路径
link_directories(${FFMPEG_LIB_DIR})

# 链接库
link_libraries(avformat avcodec avutil swscale swresample)

add_executable(rtmp_push main.cpp)

# 链接线程库
target_link_libraries(rtmp_push Threads::Threads)