c++ - openh264-bEnableFrameSkip = 0，无法控制比特率

关于opencv + H.264有很多问题，但是
他们都没有给出详细的解释。
我在视觉工作室中使用openh264(openh264-1.4.0-win32msvc.dll)以及opencv 3.1(启用了ffmpeg的cmake的自定义版本)，我想将来自网络摄像头的视频保存为H.264压缩的mp4格式



在使用openh264之前，在控制台窗口中我看到一条警告消息
“无法加载openh264库:openh264-1.4.0-win32msvc.dll
请检查您的环境和/或从此处下载:
https://github.com/cisco/openh264/releases“
(视频也未保存)

所以我下载了dll并保存在我的程序文件(exe)的文件夹中
现在，当我运行程序时，我看到了不同的错误
“[OpenH264]此= 0x0DE312C0，警告:bEnabledFrameSkip = 0，如果不启用跳过帧就无法控制RC_QUALITY_MODE和RC_TIMESTAMP_MODE的比特率”
(现在保存了视频，但是大小非常高!比特率约为1200 Kbps)

对我来说，使用h264的唯一目的是减小文件大小。.我想我可能必须自己进行一些更改才能构建openh264以消除此错误，有人可以指导我如何做吗？还是告诉我是否有办法通过代码以某种方式降低比特率？

P.S:我尝试给-1而不是CV_FOURCC()，系统中显示“已安装的编解码器”窗口，即使我从here安装了各种编解码器包和h264，我也找不到h264或x264或h264vfw

感谢和问候

最佳答案

如果要控制比特率，则必须同时使用

encoderParemeters.iRCMode = RC_OFF_MODE;
encoderParemeters.bEnableFrameSkip = true;

在这里，我以示例显示所有Openh264编码参数:

long nReturnedValueFromEncoder = WelsCreateSVCEncoder(&m_pSVCVideoEncoder);


    m_nVideoWidth = 352;
    m_nVideoHeight = 288;

    SEncParamExt encoderParemeters;

    memset(&encoderParemeters, 0, sizeof(SEncParamExt));

    m_pSVCVideoEncoder->GetDefaultParams(&encoderParemeters);

    encoderParemeters.iUsageType = CAMERA_VIDEO_REAL_TIME;
    encoderParemeters.iTemporalLayerNum = 0;
    encoderParemeters.uiIntraPeriod = 15;
    encoderParemeters.eSpsPpsIdStrategy = INCREASING_ID;
    encoderParemeters.bEnableSSEI = false;
    encoderParemeters.bEnableFrameCroppingFlag = true;
    encoderParemeters.iLoopFilterDisableIdc = 0;
    encoderParemeters.iLoopFilterAlphaC0Offset = 0;
    encoderParemeters.iLoopFilterBetaOffset = 0;
    encoderParemeters.iMultipleThreadIdc = 0;

    encoderParemeters.iRCMode = RC_BITRATE_MODE;
    encoderParemeters.iMinQp = 0;
    encoderParemeters.iMaxQp = 52;



    encoderParemeters.bEnableDenoise = false;
    encoderParemeters.bEnableSceneChangeDetect = false;
    encoderParemeters.bEnableBackgroundDetection = true;
    encoderParemeters.bEnableAdaptiveQuant = false;
    encoderParemeters.bEnableFrameSkip = true;
    encoderParemeters.bEnableLongTermReference = true;
    encoderParemeters.iLtrMarkPeriod = 20;
    encoderParemeters.bPrefixNalAddingCtrl = false;
    encoderParemeters.iSpatialLayerNum = 1;


    SSpatialLayerConfig *spartialLayerConfiguration = &encoderParemeters.sSpatialLayers[0];

    spartialLayerConfiguration->uiProfileIdc = PRO_BASELINE;//;

    encoderParemeters.iPicWidth = spartialLayerConfiguration->iVideoWidth = m_nVideoWidth;
    encoderParemeters.iPicHeight = spartialLayerConfiguration->iVideoHeight = m_nVideoHeight;
    encoderParemeters.fMaxFrameRate = spartialLayerConfiguration->fFrameRate = (float)30;

    encoderParemeters.iTargetBitrate = spartialLayerConfiguration->iSpatialBitrate = 500000;
    encoderParemeters.iTargetBitrate = spartialLayerConfiguration->iMaxSpatialBitrate = 500000;


    spartialLayerConfiguration->iDLayerQp = 24;
    //spartialLayerConfiguration->sSliceCfg.uiSliceMode = SM_SINGLE_SLICE;
    spartialLayerConfiguration->sSliceArgument.uiSliceMode = SM_SINGLE_SLICE;


    nReturnedValueFromEncoder = m_pSVCVideoEncoder->InitializeExt(&encoderParemeters);

希望对您有帮助。