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How to deal with canvas.toDataURL image/png error

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Jan 23, 2018 am 10:43 AM

imagehow

This time I will bring you canvas.toDataURL image/png error reporting, how to handle canvas.toDataURL image/png error reporting, what are the precautions, the following is a practical case , let’s take a look.

Problem background:

encountered a requirement to take a screenshot of the video being played. The video is played using the video tag, and then the real-time screenshot is captured when the video playback area is clicked. FramePicture.

The code is very simple as follows:

var video = document.getElementById(&#39;video&#39;);   
  
var canvas = document.getElementById(&#39;canvas&#39;);   
  
var ctx = canvas.getContext(&#39;2d&#39;);   
  
var img = document.getElementById(&#39;img&#39;);   
  
function snapshot() {   
   ctx.drawImage(video,0,0);   
   img.src =  canvas.toDataURL(&#39;image/png&#39;);   
}   
  
video.addEventListener(&#39;click&#39;, snapshot, false);

Problem tip:

Uncaught SecurityError: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.

After review and analysis, we found that this is actually due to the fact that the domain where the video file is located is different from the domain where the picture and page are located, resulting in a cross-domain transmission problem.

Solution:

Put the video file under the domain where the page is located.

I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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