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• ffmpeg - How to auto crop Harry Potter moving newspaper style video ?

  18 mai 2019, par hahahhhhhha

  The Harry Potter moving newspaper is like a video overlay on a static background. Here is an example youtube video :
  https://youtu.be/qQUUNmd3aco?t=1m17s the video starting from 1min, 17sec.

  HOWTO crop only the video part ? I have an image to show what i mean by the moving newspaper and what area does the video locate and what is the static background part. Please refer to the image. The area I draw by pink is where i mean by real video and any area except the video, is the static part.

  here is an illustration image :
  https://imgur.com/s6vRqek

  I understand if the frame size of the video does not change, I can specify the w, h, x, y to crop. But what if the frame size changes ? ie. w, h, x, y changes.(w, h : width, height of the video. x, y： Coordinate system starting point ) Is there a way to autodetect the static part and only crop the real video part ? like ffmpeg cropdetect for letterboxing. I tried cropdetect but failed. Any suggestion is welcome and I prefer using ffmpeg but any other softwares are welcome !

• Debugging the canvas texture code in A-Frame (FFmpeg stream as canvas source)

  1er janvier 2018, par MrDiago

  I am attempting to display a canvas as a texture in A-Frame. The canvas image is a video stream fed in from FFmpeg. This feed displays fine on the regular 2d canvas example from https://github.com/sbidolach/video-live-streaming , but I’m just getting a blank browser window when attempting to bring the code for reading FFmpeg to Canvas into the A-frame page structure.

  Please find below my current revision, any help debugging it would be greatly appreciated :

    
  
      <code class="echappe-js">&lt;script src=&quot;https://aframe.io/releases/0.7.0/aframe.min.js&quot;&gt;&lt;/script&gt;
      
  &lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/js/jsmpg.js'&gt;&lt;/script&gt;
  &lt;script&gt;<br />
  
  <br />
  
                  // Setup the WebSocket connection and start the player<br />
  
                  var client = new WebSocket( 'ws://127.0.0.1:8084/' );<br />
  
                  var canvas = document.getElementById('my-canvas');<br />
  
                  var player = new jsmpeg(client, {canvas:canvas});<br />
  
  <br />
  
                &lt;/script&gt;
  &lt;script&gt;<br />
  
  <br />
  
          AFRAME.registerComponent('draw-canvas', {<br />
  
            schema: {default: ''},<br />
  
            init: function () {<br />
  
              this.canvas = document.getElementById(this.data);<br />
  
              this.ctx = this.canvas.getContext('2d');<br />
  
  <br />
  
            }<br />
  
          });<br />
  
        &lt;/script&gt;
    
  
  

• Revision 410ae576e7 : Prevent external frame size changes in two-pass The two-pass code does not supp

  23 mai 2012, par John Koleszar

  Changed Paths : Modify /vp8/vp8_cx_iface.c Prevent external frame size changes in two-pass The two-pass code does not support the case where the application changes the frame size dynamically. Add this case to the validation checks in the vpx_codec_enc_config_set() path. Change-Id : (...)