ffmpeg opencv 打开视频文件,并且播放

// FFMpeg + OpenCV demo #include #include #include #ifdef __cplusplus extern "C" { #endif#include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __cplusplus } #endif#include static void CopyDate(AVFrame *pFrame, int width, int height, int time); static void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame); using namespace cv; using namespace std; int main(int argc, char* argv[]) { int result = 0; av_register_all(); // 注册所有FFmpeg库所支持的文件格式和codec AVFormatContext* pFormatCtx; char* filename = "up.mp4"; //输入文件名 // step1: 打开媒体文件,最后2个参数是用来指定文件格式,buffer大小和格式参数,设置成NULL的话,libavformat库会自动去探测它们 result = avformat_open_input(&pFormatCtx, filename, NULL, NULL); if (result != 0) { cout << "open file fail" << endl; return -1; } cout << "open file succ" << endl; // step2: 查找信息流的信息 result = avformat_find_stream_info(pFormatCtx, NULL); if (result != 0) { cout << "find stream fail" << endl; return -1; } cout << "find stream succ" << endl; // step3: 打印信息 //av_dump_format(pFormatCtx, 0, filename, 0); // step4:找到video流数据 int i = 0; int videoStream = -1; AVCodecContext* pCodecCtx = NULL; for (i = 0; i < pFormatCtx->nb_streams; i++) { if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { videoStream = i; break; } } if (videoStream == -1) { cout << "find stream video fail" << endl; return -1; } cout << "find stream video succ." << endl; // 得到video编码格式 pCodecCtx = pFormatCtx->streams[videoStream]->codec; // step5: 得到解码器 AVCodec* pCodec = NULL; pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL) { cout << "find decoder fail" << endl; return -1; } cout << "find decoder succ" << endl; result = avcodec_open2(pCodecCtx, pCodec, NULL); if (result != 0) { cout << "open codec fail" << endl; return -1; } cout << "open codec succ" << endl; // step6: 申请原始数据帧 和 RGB帧内存 AVFrame* pFrame = NULL; AVFrame* pFrameRGB = NULL; pFrame = av_frame_alloc(); pFrameRGB = av_frame_alloc(); if (pFrame == NULL || pFrameRGB == NULL) { return -1; } int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); uint8_t* buffer = (uint8_t*)av_malloc(numBytes * sizeof(uint8_t)); avpicture_fill((AVPicture*)pFrameRGB, buffer, AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); int frameFinishsed = 0; AVPacket packet; i = 0; // step7: 创建格式转化文本 SwsContext * pSwxCtx = sws_getContext( pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_RGB24, SWS_BILINEAR, 0, 0, 0); cv::Mat image(pCodecCtx->height, pCodecCtx->width, CV_8UC3); int b = 0; int g = 1; int r = 2; while (true) { // 得到数据包 result = av_read_frame(pFormatCtx, &packet); if (result != 0) { break; }if (packet.stream_index == videoStream) { // 解码 avcodec_decode_video2(pCodecCtx, pFrame, &frameFinishsed, &packet); if (frameFinishsed) { // 转换 sws_scale(pSwxCtx, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize); for (int m = 0; m < pCodecCtx->height; m++) { for (int n = 0; n < pCodecCtx->width; n++) { image.at(m, n)[r] = pFrameRGB->data[0][3 * (m*pCodecCtx->width + n) + 0]; image.at(m, n)[g] = pFrameRGB->data[0][3 * (m*pCodecCtx->width + n) + 1]; image.at(m, n)[b] = pFrameRGB->data[0][3 * (m*pCodecCtx->width + n) + 2]; } } cv::imshow("pic", image); cv::waitKey(30); } }av_free_packet(&packet); } avformat_close_input(&pFormatCtx); system("pause"); return 0; }





【ffmpeg opencv 打开视频文件,并且播放】ffmpeg opencv 打开视频文件,并且播放
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