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• Covert opengl framebuffer into ffmpeg encoded mp4 c++ [closed]

  14 mai 2022, par user19068953

  I want to make a program that takes an mp4 file as an input and draws something on top of it then gives the new video as an output. So far I have a program that takes a file name, have ffmpeg decode it and draw whatever i want with opengl (I have followed this tutorial that draws on top of the video separately : https://gist.github.com/hradec/a8b8ae0bf82891a5d853b06619839d9d) and have an opengl framebuffer. My question is how do put opengl's framebuffer on top of ffmpeg frames and generate a new video with it then give a new file as an output ? The framebuffer is allocated in fbo, so i want to encode it to ffmpeg, something like

  


   av_write_frame(state->fmt_ctx, &fbo) 


  


  is there a function like this that allows me to write frame data into a newly created video ?

  


  Here is my encoder :

  


      int VideoDecoder::write_frame()
{
    // Find a way to write OpenGL Frames here.
    av_packet_rescale_ts(&state->packet, VideoSt.Ctx->time_base, VideoSt.Stream->time_base);
    state->packet.stream_index = VideoSt.Stream->index;
    return av_interleaved_write_frame(state->fmt_ctx, &state->packet);
}


bool VideoDecoder::encode_video()
{

    // TODO: This is horrible fix this function.

    state->packet = { nullptr };
    av_init_packet(&state->packet);

    fflush(stdout);

    IMG_Buffer.SetNum(ColorBuffer.Num() * 4);
    uint8* DestPtr = nullptr;
    for (auto i = 0; i < ColorBuffer.Num(); i++)
    {
        DestPtr = &IMG_Buffer[i * 4];
        auto SrcPtr = ColorBuffer[i];
        *DestPtr++ = SrcPtr.R;
        *DestPtr++ = SrcPtr.G;
        *DestPtr++ = SrcPtr.B;
        *DestPtr++ = SrcPtr.A;
    }

    uint8* inData[1] = { IMG_Buffer.GetData() };


    sws_scale(SwsCtx, inData, InLineSize, 0, VideoSt.Ctx->height, VideoSt.Frame->data, VideoSt.Frame->linesize);

    VideoSt.Frame->pts = VideoSt.NextPts++;
    if (FFmpegEncode(VideoSt.Frame) < 0)
        return false;

    auto ret = WriteFrame();

    if (ret < 0)
    {
        auto errstr = FString(av_err2str(ret));
    }
    av_packet_unref(&state->packet);


    GotOutput = 0;
    auto ret = avcodec_send_frame(VideoSt.Ctx, frame);
    if (ret < 0 && ret != AVERROR_EOF) {
        auto errstr = FString(av_err2str(ret));
        return -1;
    }

    ret = avcodec_receive_packet(VideoSt.Ctx, &Pkt);
    if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
        return 0;

    if (ret < 0)
    {
        auto errstr = FString(av_make_error_string(ret).c_str());
        av_packet_unref(&Pkt);
        return -1;
    }

    GotOutput = 1;
    return 0;


    for (GotOutput = 1; GotOutput; count++)
    {
        fflush(stdout);

        FFmpegEncode(nullptr);

        if (GotOutput)
        {
            auto ret = WriteFrame(false);
            if (ret < 0)
            {
                auto errstr = FString(av_err2str(ret));
            }
            av_packet_unref(&Pkt);
        }
    }

    auto ret = av_write_trailer(FmtCtx);
    if (ret < 0)
    {
        auto errstr = FString(av_err2str(ret));
    }
}


  


  and here is my simple frame buffer :

  


  bool OpenGLRenderer::alloc_frame_buffer()
{
    unsigned int fbo;
    glGenFramebuffers(1, &fbo);

    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) return false;

    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    unsigned int texture;
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 800, 600, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
}


  


• Using Windows named pipes with ffmpeg pipes (Doesnt work)

  25 octobre 2019, par Estr

  I’m trying to send audio and video RAW through c# pipes to FFMPEG, I’ve been reading and trying to follow what’s shown here : https://docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeserverstream?view=netframework-4.8

  This a fragment of the code...

          NamedPipeServerStream p_1;
  
          NamedPipeServerStream p_2;
  
          p_1 = new NamedPipeServerStream("p_1", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
          p_2 = new NamedPipeServerStream("p_2", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
          p_1.WaitForConnection();
  
  
  
          p_2.WaitForConnection();

  .......

  I run this command in FFMPEG : ffmpeg.exe -i \.\pipe\p_1 -vcodec hevc -r 8 -f alaw -ar:a 16000 -ac:a 1 -i \.\pipe\p_2 o.mp4

  But the program stays on the line : p_2.WaitForConnection() ;

  How can I solve it ?

• Encode h264 automatically on nginx server

  18 février 2017, par Thinh Pham

  I have installed and configured my own streaming server using Nginx with rtmp module base on this tutorial https://www.vultr.com/docs/setup-nginx-on-ubuntu-to-stream-live-hls-video. I only use live application and record stream into flv file. And now I want to encode any new flv files in my VOD directory automatically to play it on my website. Is it possible to config it in my nginx.conf ? I have tried set record_suffix .mp4; in order to play it without encode but failed.
  Additional, exec ffmpeg -i is not work for me when I want to restream into mobile application.