[Libav-user] gdigrab grab not working with c++ code.

[Neural Net]

I am using  build from https://github.com/BtbN/FFmpeg-Builds/releases for
Windows 64 with MSVC compiler, I need to capture screen using c++ code
using gdigrab, but  gdigrab not working



So I check the ffmpeg exe with formats arg

     .\ffmpeg.exe -formats
Give the result

D d gdigrab GDI API Windows frame grabber

Which says gdigrab is there with ffmpeg exe. And I can screen capture with
this exe too. I am linking the same lib coming with this exe, so the below
code should expected to work with gdigrab



avformat_network_init();

    AVFormatContext *formatCtx = nullptr;
    AVDictionary *options = nullptr;

    const char *inputSource = "desktop";
    const char *inputFormat = "gdigrab";

    // Initialize options
    av_dict_set(&options, "video_size", "800x600", 0);
    av_dict_set(&options, "offset_x", "100", 0);
    av_dict_set(&options, "offset_y", "100", 0);
    av_dict_set(&options, "framerate", "30", 0);

    // Debug options
    char *dump = nullptr;
    av_dict_get_string(options, &dump, '=', ',');
    qDebug() << "Options: " << dump;
    av_free(dump);


    const AVInputFormat *fmt = nullptr;
    void *opaque = nullptr;

    while ((fmt = av_demuxer_iterate(&opaque))) {
        qDebug() << fmt->name;
    }


    // Find input format
   const  AVInputFormat *inputFmt = av_find_input_format(inputFormat);
    if (!inputFmt) {
        qDebug() << "Error: Input format not found:" << inputFormat;
    }

    // Open input
    int ret = avformat_open_input(&formatCtx, inputSource, inputFmt,
&options);
    if (ret < 0) {
        char errbuf[AV_ERROR_MAX_STRING_SIZE];
        av_strerror(ret, errbuf, sizeof(errbuf));
        qDebug() << "Error: Unable to open input source:" << inputSource <<
", " << errbuf;
        return;
    }

It always print

Error: Input format not found: gdigrab
Error: Unable to open input source: desktop ,  No such file or directory
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