windows下使用camera （ffmpeg dshow方式）

最新推荐文章于 2025-05-28 14:33:51 发布

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最新推荐文章于 2025-05-28 14:33:51 发布

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分类专栏： ffmpeg

本文链接：https://blog.youkuaiyun.com/lixiaowei16/article/details/106091697

本文档介绍了如何在Windows操作系统下利用ffmpeg的dshow接口打开和解码摄像头流。首先，通过OpenCV枚举本地可用的camera，并展示其支持的模式。然后，使用ffmpeg库设置摄像头参数，通过dshow打开指定分辨率和帧率的视频流，并进行解码处理。整个过程包括了avformat_open_input、avformat_find_stream_info、avcodec_open2等关键步骤。

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方法概要：先读取camera支持的mode，然后用ffmpeg dshow打开camera并解码压缩流

一. 用相关代码读取本地camera当前支持的输出mode，方便后续选择mode来打开camera：

bool EnumerateCameras(vector<int>& camIdx)
{
   camIdx.clear();
   struct CapDriver {
       int enumValue; string enumName; string comment;
   };
   // list of all CAP drivers (see highgui_c.h)
   vector<CapDriver> drivers;
   drivers.push_back({ CV_CAP_MIL, "CV_CAP_MIL", "MIL proprietary drivers" });
   drivers.push_back({ CV_CAP_VFW, "CV_CAP_VFW", "platform native" });
   drivers.push_back({ CV_CAP_FIREWARE, "CV_CAP_FIREWARE", "IEEE 1394 drivers" });
   drivers.push_back({ CV_CAP_STEREO, "CV_CAP_STEREO", "TYZX proprietary drivers" });
   drivers.push_back({ CV_CAP_QT, "CV_CAP_QT", "QuickTime" });
   drivers.push_back({ CV_CAP_UNICAP, "CV_CAP_UNICAP", "Unicap drivers" });
   drivers.push_back({ CV_CAP_DSHOW, "CV_CAP_DSHOW", "DirectShow (via videoInput)" });
   drivers.push_back({ CV_CAP_MSMF, "CV_CAP_MSMF", "Microsoft Media Foundation (via videoInput)" });
   drivers.push_back({ CV_CAP_PVAPI, "CV_CAP_PVAPI", "PvAPI, Prosilica GigE SDK" });
   drivers.push_back({ CV_CAP_OPENNI, "CV_CAP_OPENNI", "OpenNI (for Kinect)" });
   drivers.push_back({ CV_CAP_OPENNI_ASUS, "CV_CAP_OPENNI_ASUS", "OpenNI (for Asus Xtion)" });
   drivers.push_back({ CV_CAP_ANDROID, "CV_CAP_ANDROID", "Android" });
   drivers.push_back({ CV_CAP_ANDROID_BACK, "CV_CAP_ANDROID_BACK", "Android back camera" }),
   drivers.push_back({ CV_CAP_ANDROID_FRONT, "CV_CAP_ANDROID_FRONT", "Android front camera" }),
   drivers.push_back({ CV_CAP_XIAPI, "CV_CAP_XIAPI", "XIMEA Camera API" });
   drivers.push_back({ CV_CAP_AVFOUNDATION, "CV_CAP_AVFOUNDATION", "AVFoundation framework for iOS" });
   drivers.push_back({ CV_CAP_GIGANETIX, "CV_CAP_GIGANETIX", "Smartek Giganetix GigEVisionSDK" });
   drivers.push_back({ CV_CAP_INTELPERC, "CV_CAP_INTELPERC", "Intel Perceptual Computing SDK" });

   std::string winName, driverName, driverComment;
   int driverEnum;
   Mat frame;
   bool found;
   qDebug() << "Searching for cameras IDs..." << endl << endl;
   for (int drv = 0; drv < drivers.size(); drv++)
   {
       driverName = drivers[drv].enumName;
       driverEnum = drivers[drv].enumValue;
       driverComment = drivers[drv].comment;
       qDebug() << "Testing driver " << QString(driverName.c_str()) << "...";
       found = false;

       int maxID = 100; //100 IDs between drivers
       if (driverEnum == CV_CAP_VFW)
       &nbs