使用opencv + ffmpeg 开发视频播放器Demo

#include <opencv2/opencv.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio.hpp>extern "C" {
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
}int main() {// 初始化 FFmpegav_register_all();// 打开视频文件AVFormatContext* formatContext = avformat_alloc_context();if (avformat_open_input(&formatContext, "video.mp4", NULL, NULL) != 0) {std::cout << "无法打开视频文件" << std::endl;return -1;}// 获取视频流信息if (avformat_find_stream_info(formatContext, NULL) < 0) {std::cout << "无法获取视频流信息" << std::endl;return -1;}// 寻找视频流索引int videoStreamIndex = -1;for (int i = 0; i < formatContext->nb_streams; i++) {if (formatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {videoStreamIndex = i;break;}}if (videoStreamIndex == -1) {std::cout << "无法找到视频流" << std::endl;return -1;}// 获取视频解码器AVCodecParameters* codecParameters = formatContext->streams[videoStreamIndex]->codecpar;AVCodec* codec = avcodec_find_decoder(codecParameters->codec_id);AVCodecContext* codecContext = avcodec_alloc_context3(codec);avcodec_parameters_to_context(codecContext, codecParameters);avcodec_open2(codecContext, codec, NULL);// 创建窗口cv::namedWindow("Video Player", cv::WINDOW_NORMAL);// 读取视频帧AVPacket packet;AVFrame* frame = av_frame_alloc();while (av_read_frame(formatContext, &packet) >= 0) {if (packet.stream_index == videoStreamIndex) {avcodec_send_packet(codecContext, &packet);avcodec_receive_frame(codecContext, frame);// 转换 AVFrame 到 OpenCV Matcv::Mat image(cv::Size(frame->width, frame->height), CV_8UC3, frame->data[0], frame->linesize[0]);// 显示图像cv::imshow("Video Player", image);cv::waitKey(25);}av_packet_unref(&packet);}// 清理av_frame_free(&frame);avcodec_close(codecContext);avformat_close_input(&formatContext);return 0;
}