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• ffmpeg overlay video with semi transparent video

  20 janvier 2018, par endryha

  I am trying to overlay background video with another semi transparent video using ffmpeg.

  Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

  The problem is that I don’t know how to make overlay video semitransparent.

  So far I am using following commands :

  ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

  I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

  UPDATE #1

  It looks like blend filter is exactly what I need but another issue came out :

  ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  [Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
  
  [Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

  So probably if I can resolve issue with different resolutions I am done with my task.
  Please advice what is the direction to go.

  UPDATE#2

  To solve different resolution problem I decided to crop video and then proceed with blending filter

  ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
  
  
  
  ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
  
  -filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

• ffmpeg overlay video with semi transparent video

  25 octobre 2015, par endryha

  I am trying to overlay background video with another semi transparent video using ffmpeg.

  Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

  The problem is that I don’t know how to make overlay video semitransparent.

  So far I am using following commands :

  ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

  I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

  UPDATE #1

  It looks like blend filter is exactly what I need but another issue came out :

  ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  [Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
  
  [Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

  So probably if I can resolve issue with different resolutions I am done with my task.
  Please advice what is the direction to go.

  UPDATE#2

  To solve different resolution problem I decided to crop video and then proceed with blending filter

  ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
  
  
  
  ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
  
  -filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

• Why is the character in video is blurry when rending video by d3d9

  16 août 2021, par TONY

  I use the following code to render video :

  


  IDirect3DSurface9* surface = (IDirect3DSurface9*)frame->data[3];&#xA;        IDirect3DDevice9* pDevice = (IDirect3DDevice9*)(((DXVA2DevicePriv*)((AVHWDeviceContext*)hw_device_ctx->data)->user_opaque)->d3d9device);&#xA;        pDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);&#xA;        pDevice->BeginScene();&#xA;        CComPtr<idirect3dsurface9> back_buffer;&#xA;&#xA;        HRESULT hr = pDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &amp;back_buffer);&#xA;        if (FAILED(hr)) {&#xA;            //RTC_LOG(LS_ERROR) &lt;&lt; "Failed to get back buffer" &lt;&lt; (int)hr;&#xA;            return -1;&#xA;        }&#xA;&#xA;        if (surface != nullptr) {&#xA;            hr = pDevice->StretchRect(surface, nullptr, back_buffer, nullptr, D3DTEXF_POINT);&#xA;            if (FAILED(hr)) {&#xA;                &#xA;                return -1;&#xA;            }&#xA;        }&#xA;&#xA;        pDevice->EndScene();&#xA;        &#xA;        hr = pDevice->Present(nullptr, nullptr, hWnd, nullptr);&#xA;</idirect3dsurface9>

  


  I don't know why the character in the video is blurry, but the image seems be better.
Is there any settings to set to solve it ?