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• Every 27 seconds immediately appear around 3 seconds black

  23 juin 2018, par Monso

  I want every 27 seconds. appears a black space of 3 seconds and it repeats to the end. Example 0:27 0:54 1:21 until the end of the video .... here are 2 code I used but the second code does not work. The 1st code it automatically blurs the population, I want it not to fade itself. that i want it immediately black
  .please help me finish it

   Code 1
  
         ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:24,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1" output.mp4
  
  
  
   Code 2
  
         ffmpeg -i input.mp4 -vf "select='lt(mod(t,30),27)',setpts=N/FRAME_RATE/TB" output.mp4

• Suppress black margins on the sides of an animation

  26 avril 2018, par Clinton Winant

  I need to make an animation out of a collection of jpeg images. The image size, as given by display, is 1200x900. I can control the size of the jpg images with convert, but not sure what a good size would be. I use the following ffmpeg call :

  ffmpeg -f image2 -i img%04d.jpg -r 24  sound.avi

  In spite of a long string of warnings like

  Past duration 0.879997 too large

  sound.avi is produced, however the animation includes black right and left margins (see attached screen shot of the first frame)

  

  that I need to suppress. I am under the impression that the 4x3 format of the jpg images is standard ? I view the animation with

  mplayer sound.avi

  The OS is Debian buster

  Further experiments suggest that the black margins disappear if the jpg files have an aspect ratio 16:9. Is that the only AR possible ?

  The output of

  ffmpeg -f image2 -i img%04d.jpg -vf cropdetect -vframes 5 -f null

  requested by @Gyan is

  ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Debian 7.3.0-15)
  
    configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Trailing options were found on the commandline.
  
  Input #0, image2, from 'img%04d.jpg':
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1200x900 [SAR 150:150 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc

• Black video when using ffplay of received data over upd [closed]

  4 février 2023, par Alexandru-Marian Buza

  I'm encoding frames from a id3d11texture2d, and the receive packet size is around 70-80.
When i'm sending over udp, and use ffplay to show the video, i get a black screen.
Resolution and fps are well determined by ffplay.

  


  AcquiredBuffer.Attach(Buffer.MetaData.pSurface);

            ID3D11Texture2D* texture;
            ID3D11Texture2D* stagingTexture;
            AcquiredBuffer->QueryInterface(IID_PPV_ARGS(&texture));
            
            texture->GetDesc(&desc);
            desc.Usage = D3D11_USAGE_STAGING;
            desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
            desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
            desc.BindFlags = 0;
            desc.MiscFlags = 0;
            hr = m_Device->Device->CreateTexture2D(&desc, NULL, &stagingTexture);
            if (stagingTexture != 0) {
                m_Device->DeviceContext->CopyResource(stagingTexture, texture);
                D3D11_MAPPED_SUBRESOURCE mappedData;
                m_Device->DeviceContext->Map(stagingTexture, 0, D3D11_MAP_READ, 0, &mappedData);
                
                memcpy(frame->data[0], mappedData.pData, mappedData.DepthPitch);
                auto ret = avcodec_send_frame(codec, frame);
                if (ret < 0) {
                    writeText("Send frame failed");
                }
                else {
                    while (ret >= 0) {
                        ret = avcodec_receive_packet(codec, packet);
                        for (int i = 0; i < packet->size; i++) {
                            if (packet->data[i] != 0) {
                            }
                        }
                        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
                            break;
                        }
                        else if (ret < 0) {
                            writeText("Error durring encoding");
                        }
                        if (sendto(s, (char*)packet->data, packet->size * sizeof(uint8_t), 0, (sockaddr*)&dest, sizeof(dest)) == SOCKET_ERROR) {
                            writeText("Failed to send frame");
                        }
                        av_packet_unref(packet);
                    }
                }
                
                m_Device->DeviceContext->Unmap(stagingTexture, 0);
                stagingTexture->Release();