qt ffmpeg拉取桌面推流录制视频

要在Qt中使用FFmpeg拉取桌面并进行推流录制视频，你可以按照以下步骤进行操作： 1. 首先，你需要在Qt项目中集成FFmpeg库。你可以从FFmpeg的官方网站（https://ffmpeg.org）下载最新的静态库或使用包管理工具（如Homebrew）进行安装。 2. 在Qt项目的.pro文件中，添加FFmpeg库的路径和链接信息。例如： ``` INCLUDEPATH += /path/to/ffmpeg/include LIBS += -L/path/to/ffmpeg/lib -lavformat -lavcodec -lswscale ``` 请确保将上面的路径替换为你实际安装FFmpeg的路径。 3. 创建一个Qt窗口应用程序，并添加一个QPushButton按钮和一个QLabel标签。 4. 在按钮的点击事件中，编写代码以开始屏幕捕获、推流和录制视频。你可以使用Qt的QScreen类来捕获屏幕内容，并使用FFmpeg进行编码、推流和录制。 以下是一个简单的示例代码： ```cpp #include <QApplication> #include <QPushButton> #include <QLabel> #include <QScreen> extern "C" { #include <libavformat/avformat.h> #include <libavcodec/avcodec.h> #include <libswscale/swscale.h> } int main(int argc, char *argv[]) { QApplication app(argc, argv); QPushButton button("Start Recording"); QLabel label; label.setAlignment(Qt::AlignCenter); QObject::connect(&button, &QPushButton::clicked, [&]() { QScreen *screen = QGuiApplication::primaryScreen(); QDesktopWidget *desktop = QApplication::desktop(); QRect screenGeometry = desktop->screenGeometry(screen); AVFormatContext *formatContext = nullptr; AVOutputFormat *outputFormat = nullptr; AVCodecContext *codecContext = nullptr; AVCodec *codec = nullptr; AVFrame *frame = nullptr; AVPacket packet; av_register_all();＊＊＊format_network_init(); QString url = "rtmp://your-streaming-server-url"; QString outputFile = "output_file.mp4"; avformat_alloc_output_context2(&formatContext, nullptr, "flv", url.toStdString().c_str()); outputFormat = formatContext->oformat; AVDictionary *options = nullptr; av_dict_set(&options, "framerate", "25", 0); av_dict_set(&options, "video_size", QString::number(screenGeometry.width()).toStdString().c_str(), 0); if (outputFormat->video_codec != AV_CODEC_ID_NONE) { codec = avcodec_find_encoder(outputFormat->video_codec); codecContext = avcodec_alloc_context3(codec); codecContext->width = screenGeometry.width(); codecContext->height = screenGeometry.height(); codecContext->time_base = {1, 25}; codecContext->gop_size = 10; codecContext->pix_fmt = AV_PIX_FMT_YUV420P; if (formatContext->oformat->flags & AVFMT_GLOBALHEADER) codecContext->flags |= AV_CODEC_FLAG_GLOBAL_HEADER; avcodec_open2(codecContext, codec, nullptr); frame = av_frame_alloc(); frame->format = codecContext->pix_fmt; frame->width = codecContext->width; frame->height = codecContext->height; av_frame_get_buffer(frame, 32); avio_open2(&formatContext->pb, url.toStdString().c_str(), AVIO_FLAG_WRITE, nullptr, &options); avformat_write_header(formatContext, nullptr); AVFormatContext *outputFormatContext = nullptr; avformat_alloc_output_context2(&outputFormatContext, nullptr, nullptr, outputFile.toStdString().c_str()); if (outputFormatContext != nullptr) { AVStream *outputStream = avformat_new_stream(outputFormatContext, nullptr); if (outputStream != nullptr) { avcodec_parameters_from_context(outputStream->codecpar, codecContext); outputStream->codecpar->codec_tag = 0; avio_open(&outputFormatContext->pb, outputFile.toStdString().c_str(), AVIO_FLAG_WRITE); avformat_write_header(outputFormatContext, nullptr); while (true) { QImage image = screen->grabWindow(0).toImage().convertToFormat(QImage::Format_RGB888); if (image.isNull()) break; AVFrame *rgbFrame = av_frame_alloc(); rgbFrame->format = AV_PIX_FMT_RGB24; rgbFrame->width = image.width(); rgbFrame->height = image.height(); av_frame_get_buffer(rgbFrame, 32); QImageToAVFrame(image, rgbFrame); sws_scale(sws_getContext(rgbFrame->width, rgbFrame->height, AV_PIX_FMT_RGB24, codecContext->width, codecContext->height, codecContext->pix_fmt, SWS_BILINEAR, nullptr, nullptr, nullptr), rgbFrame->data, rgbFrame->linesize, 0, rgbFrame->height, frame->data, frame->linesize); av_init_packet(&packet); packet.data = nullptr; packet.size = 0; avcodec_send_frame(codecContext, frame); avcodec_receive_packet(codecContext, &packet); av_interleaved_write_frame(formatContext, &packet); av_interleaved_write_frame(outputFormatContext, &packet); av_packet_unref(&packet); av_frame_unref(rgbFrame); av_frame_free(&rgbFrame); } av_write_trailer(formatContext); av_write_trailer(outputFormatContext); av_frame_free(&frame); avcodec_close(codecContext); avcodec_free_context