一、基本介绍
该软件里推流和视频保存使用FFMPEG库完成，界面框架采用QT，视频和音频可以同步推流和录制，FFMPEG本身支持跨平台编译开发，QT也支持跨平台，在Android、Linux、windows都运行良好，只需要在不同平台编译对应的ffmpeg库即可，逻辑代码部分通用。
该源码在2021年完成了新版本的更新,支持桌面推流和视频录制，效果图在文章的第四章可以查看。
二、windows下软件运行效果
（1）主界面效果
（2）保存视频到本地，设置录制间隔为10秒一个视频
（3）推流视频到B站，必须保证RTMP地址是有效的，如果地址无效软件会自动退出
三、核心代码
代码里除了FFMEG代码之外，主要的核心代码是摄像头颜色转换代码，因为不同的摄像头输出的原始格式不一样，代码里还需要做颜色转换。
void VideoReadThread_0::slotOnProbeFrame(const QVideoFrame &frame) { QVideoFrame cloneFrame(frame); cloneFrame.map(QAbstractVideoBuffer::ReadOnly); // qDebug()<<"height:"<<cloneFrame.height(); // qDebug()<<"width:"<<cloneFrame.width(); //qDebug()<<"bytesPerLine:"<<cloneFrame.bytesPerLine(); //qDebug()<<"mappedBytes:"<<cloneFrame.mappedBytes(); //qDebug()<<"pixelFormat:"<<cloneFrame.pixelFormat(); unsigned char rgb_buffer[VIDEO_WIDTH*VIDEO_HEIGHT*3]; if(cloneFrame.pixelFormat()==QVideoFrame::Format_NV21) { NV21_TO_RGB24(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height()); } else if(cloneFrame.pixelFormat()==QVideoFrame::Format_YUYV) { yuyv_to_rgb(cloneFrame.bits(),rgb_buffer,cloneFrame.width(),cloneFrame.height()); } else if(cloneFrame.pixelFormat()==QVideoFrame::Format_RGB24) { memcpy(rgb_buffer,cloneFrame.bits(),sizeof(rgb_buffer)); } else if(cloneFrame.pixelFormat()==QVideoFrame::Format_BGR24) { memcpy(rgb_buffer,cloneFrame.bits(),sizeof(rgb_buffer)); } else if(cloneFrame.pixelFormat()==QVideoFrame::Format_Jpeg) { } else { qDebug("当前格式编码为%1,暂时不支持转换.\n"); } //加载图片数据 QImage image(rgb_buffer, cloneFrame.width(), cloneFrame.height(), QImage::Format_RGB888); if(cloneFrame.pixelFormat()==QVideoFrame::Format_BGR24) { image=image.rgbSwapped(); //BGR格式转RGB image=image.mirrored(false, true); } if(cloneFrame.pixelFormat()==QVideoFrame::Format_Jpeg) { image.loadFromData((const uchar *)cloneFrame.bits(),cloneFrame.mappedBytes()); } //绘制图片水印 QDateTime dateTime(QDateTime::currentDateTime()); //时间效果: 2020-03-05 16:25::04 周一 QString qStr=""; qStr+=dateTime.toString("yyyy-MM-dd hh:mm:ss ddd"); QPainter pp(&image); QPen pen = QPen(Qt::white); pp.setPen(pen); pp.drawText(QPointF(0,20),qStr); //提取RGB数据 unsigned char *p=rgb_buffer; for(int i=0;i<image.height();i++) { for(int j=0;j<image.width();j++) { QRgb rgb=image.pixel(j,i); *p++=qRed(rgb); *p++=qGreen(rgb); *p++=qBlue(rgb); } } videoaudioencode_0.video_encode_mutex.lock(); RGB24_TO_YUV420(rgb_buffer,image.width(),image.height(),video_yuv420p_buff); videoaudioencode_0.video_encode_mutex.unlock(); videoaudioencode_0.video_WaitConditon.wakeAll(); emit VideoDataOutput(image); //发送信号 cloneFrame.unmap(); }
xxx.pro工程文件代码：
QT += core gui QT += multimediawidgets QT += xml QT += multimedia QT += network QT += widgets QT += serialport greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += c++11 # The following define makes your compiler emit warnings if you use # any Qt feature that has been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ Color_conversion.cpp \ audio_video_encode_0.cpp \ ffmpeg_code.cpp \ main.cpp \ widget.cpp HEADERS += \ Color_conversion.h \ audio_video_encode_0.h \ config.h \ ffmpeg_code.h \ widget.h FORMS += \ widget.ui # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target RC_ICONS=log.ico win32 { message('运行win32版本') INCLUDEPATH+=$$PWD/ffmpeg-win32-shared-dll/include LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/av* LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/sw* LIBS+=$$PWD/ffmpeg-win32-shared-dll/bin/pos* } RESOURCES += \ image.qrc
四、更新版本界面
