[windows][C++]opencv读取rtsp图像处理后使用ffmpeg推流rtmp

[python][ubuntu]opencv读取rtsp图像处理后推流rtmp

Windows10下搭建nginx-rtmp流媒体服务器

参考上述链接解决环境等问题
自行替换代码中的rtsp、rtmp地址和ffmpeg位置
样例代码设置流的分辨率为1280x720、30帧，亦可执行替换
推流之后可使用potplayer等播放器打开rtmpUrl来获取流，也可通过opencv获取流并播放

#include 
#include 
#include 
#include 
#include 

using namespace std;
using namespace cv;

const char* rtspUrl = "rtsp://admin:[email protected]:554/h264/ch1/main/av_stream";
const char* rtmpUrl = "rtmp://localhost:1900/live/test";
const char* ffmpegPath = R"(D:\dependency\ffmpeg-4.4.1-full_build\bin\ffmpeg.exe)";

Size streamSize = { 1280,720 };

string join(const vector<string>& sequence, const string& separator)
{
	std::string result;
	for (size_t i = 0; i < sequence.size(); ++i)
		result += sequence[i] + ((i != sequence.size() - 1) ? separator : "");
	return result;
}

void videoTest() {
	VideoCapture cap(rtspUrl);
	vector<string> arguments = {
		ffmpegPath,
		"-y", "-an",
		"-f", "rawvideo",
		"-vcodec", "rawvideo",
		"-pix_fmt", "bgr24",
		"-s", "1280x720",
		"-r", "30",
		"-i", "-",
		"-c:v", "libx264",
		"-pix_fmt", "yuv420p",
		"-preset", "ultrafast",
		"-f", "flv",
		rtmpUrl };
	string cmd = join(arguments, " ");
	cout << cmd << endl;
	SECURITY_ATTRIBUTES sa;
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
	sa.lpSecurityDescriptor = NULL;
	sa.bInheritHandle = TRUE;

	//管道创建
	HANDLE hwrite, hread;
	if (CreatePipe(&hread, &hwrite, &sa, 0) == NULL)
	{
		cout << "pPipe Create error!" << endl;
		return;
	}

	//进程创建
	STARTUPINFO si;
	ZeroMemory(&si, sizeof(STARTUPINFO));
	si.cb = sizeof(STARTUPINFO);
	si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
	si.wShowWindow = SW_SHOW;
	si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
	si.hStdOutput = hwrite;
	si.hStdInput = hread;

	PROCESS_INFORMATION pi;
	//创建子进程
	if (!CreateProcess(NULL, cmd.data(), NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi)) {
		cout << "进程创建错误" << endl;
		CloseHandle(hread);
		CloseHandle(hwrite);
		hread = NULL;
		hwrite = NULL;
		return;
	}

	CloseHandle(pi.hThread);
	CloseHandle(pi.hProcess);

	Mat frame;
	while (cap.isOpened()) {
		cap >> frame;
		cv::resize(frame, frame, streamSize);
		imshow("rtsp", frame);
		if (waitKey(1) == 27)
			break;
		DWORD txcount = 0;
		if (!WriteFile(hwrite, frame.data, frame.step[0] * frame.rows, &txcount, nullptr)) {
			cout << "WriteFile failed\n";
			continue;
		}
	}
}

int main() {
	videoTest();
}