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• 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 ?

  


• How to play mp4 video file with HTML5 video tag on iOS (iPhone and iPad) ?

  22 avril 2015, par Mokielas

  I want to display HTML5 video to my users using the video tag. For Firefox, Chrome and Opera WEBM works as expected. In Safari on Windows and Mac my MP4 version works, too. The only problem I’m experiencing is, that it won’t play on iPad and iPhone (Safari of course).

  Create video

  The MP4 (h.264 + acc-lc) is converted like this (with profile : baseline and level 3.0 for maximum compatibility with iOS) :

  • Stream #0:0(eng) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x352, 198 kb/s, 17 fps, 17 tbr, 17408 tbn, 34 tbc (default)
  • Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 56 kb/s (default)

  Edit : Whole ffprobe output (slight changes in bitrate etc. to the above mentioned) :

  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf56.30.100
  
  Duration: 00:01:00.05, start: 0.046440, bitrate: 289 kb/s
  
  Stream #0:0(eng): Video: h264 (Constrained Baseline) 
  
  (avc1 /0x31637661), yuv420p, 640x352, 198 kb/s, 25 fps, 25 tbr, 
  
  12800 tbn, 50 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, 
  
  stereo, fltp, 85 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  I found various requirements for iOS devices like this and this, also someone mentioned to add the yuv420p pixel format when converting.

  In fact the ffmpeg cmd looks like this :

  ffmpeg -i __inputfile__ -vcodec libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -b:v 200K -r 17 -bt 800K -c:a libfdk_aac -b:a 85k -ar 44100 -y __outputfile_lowversion__.mp4

  Display video

  With Modernizr I detect which format is "supported" and add it to the src or the video tag. Last thing is adding the right MIME type. For mp4 I add type="video/mp4". The full code for the video tag is :

  <video class="p-video" preload="auto" autoplay="" type="video/mp4" src="http://full.url/to/video_low.mp4"></video>

  I tried various ways : own implementation with own interface, controls and stuff from browser vendors and video.js just to check whether i’m too studip for this. All work in the environments listed above except for iPhone and iPad.

  I read this article on Video on the web, especially this part and only serve the "right" file with the "right" type without a posterattribute set.

  My Apache has

  AddType video/mp4                      mp4 m4v f4v f4p
  
  AddType video/ogg                      ogv
  
  AddType video/webm                     webm

  And byte-ranges are enabled. This is needed to get partial content from the server.

  Has anyone a clue what’s going on there ? Thanks in advance !

  Edit : Safari and Chrome both throw MEDIA_ERR_SRC_NOT_SUPPORTED Error on iPad. There must be an issue with the encoding.