RK3588板子上利用OpenCV打开摄像头，并用MPP硬件编码后保存视频文件，C++代码示例

好的，下面是在RK3588板子上利用OpenCV打开摄像头，并用MPP硬件编码后保存视频文件的C++代码示例：

#include <opencv2/opencv.hpp>
#include <rockchip/rockchip_mpp.h>

int main(int argc, char** argv) {
    // 打开摄像头
    cv::VideoCapture cap(0);
    if (!cap.isOpened()) {
        std::cerr << "Failed to open camera!" << std::endl;
        return -1;
    }

    // 创建MPP编码器
    MPP_CTX mpp_ctx = mpp_create(MPP_CTX_ENC_VCODEC);
    if (!mpp_ctx) {
        std::cerr << "Failed to create MPP context!" << std::endl;
        return -1;
    }

    // 配置MPP编码器
    MPP_ENC_CONFIG mpp_enc_cfg;
    memset(&mpp_enc_cfg, 0, sizeof(mpp_enc_cfg));
    mpp_enc_cfg.format = MPP_FMT_YUV420P;
    mpp_enc_cfg.width = cap.get(CV_CAP_PROP_FRAME_WIDTH);
    mpp_enc_cfg.height = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
    mpp_enc_cfg.fps_in = 30;
    mpp_enc_cfg.fps_out = 30;
    mpp_enc_cfg.bitrate = 5000000;
    mpp_enc_cfg.gop = 30;
    mpp_enc_cfg.level = MPP_ENC_LEVEL_H264_MAIN;
    mpp_enc_cfg.profile = MPP_ENC_PROFILE_H264_MAIN;
    mpp_enc_cfg.rc_mode = MPP_ENC_RC_MODE_CBR;
    mpp_enc_cfg.qp = 18;
    mpp_enc_cfg.bps_target = mpp_enc_cfg.bitrate;
    mpp_enc_cfg.bps_max = mpp_enc_cfg.bitrate;
    mpp_enc_cfg.bps_min = mpp_enc_cfg.bitrate;
    mpp_enc_cfg.qp_max = 50;
    mpp_enc_cfg.qp_min = 10;
    mpp_enc_cfg.qp_step = 2;
    mpp_enc_cfg.vbv_size = mpp_enc_cfg.bitrate / 30;
    mpp_enc_cfg.vbv_time = 1;
    mpp_enc_cfg.vbv_delay = 0;
    int ret = mpp_init(mpp_ctx, MPP_CTX_ENC_VCODEC, &mpp_enc_cfg);
    if (ret) {
        std::cerr << "Failed to initialize MPP encoder!" << std::endl;
        return -1;
    }

    // 创建视频文件
    cv::VideoWriter writer("output.mp4",
        cv::VideoWriter::fourcc('a', 'v', 'c', '1'),
        cap.get(CV_CAP_PROP_FPS),
        cv::Size(cap.get(CV_CAP_PROP_FRAME_WIDTH), cap.get(CV_CAP_PROP_FRAME_HEIGHT)));
    if (!writer.isOpened()) {
        std::cerr << "Failed to create video file!" << std::endl;
        return -1;
    }

    // 循环读取摄像头帧并进行编码
    cv::Mat frame;
    MPP_FRAME mpp_frame;
    while (cap.read(frame)) {
        mpp_frame = mpp_frame_create_from_stdfb(frame.ptr(0), frame.step[0],
            frame.ptr(1), frame.step[1],
            frame.ptr(2), frame.step[2],
            frame.cols, frame.rows);
        ret = mpp_encode(mpp_ctx, mpp_frame);
        if (ret) {
            std::cerr << "Failed to encode frame!" << std::endl;
            return -1;
        }
        MPP_PACKET mpp_packet = mpp_packet_get(mpp_ctx);
        if (mpp_packet) {
            writer.write(frame);
            mpp_packet_put(mpp_packet);
        }
        mpp_frame_deinit(&mpp_frame);
    }

    // 释放资源
    cv::destroyAllWindows();
    mpp_destroy(mpp_ctx);
    writer.release();

    return 0;
}

请注意，这只是一个简单的示例，您可能需要根据实际情况对其进行修改。如果您有任何问题或疑问，请随时问我。