How do I download video from blob link on Windows 11 ?

Since a blob is already a sign that content has been downloaded, there's no need to re-download it. Unlike text data, blobs are binary data, which means they take up significantly less space. Additionally, since the data has already been downloaded, the browser doesn't need to send multiple requests to the originating server to render the content. This reduces the number of requests and improves overall performance.

You can use this JS code to download video from blog link url:

function onChange() {
  var file = document.getElementById('fileItem').files[0];
  var vid = document.getElementsByTagName('video')[0];
  var url = URL.createObjectURL(file);

  document.getElementById('blob').innerHTML = "Blob URL is:<br>".concat(url); 
  document.getElementById('fileItem').type = "hidden";

  vid.src=url;
  vid.load();
  vid.onloadeddata = function() {
    vid.play();
  }
}

To download video from blob link, first navigate to the network tab of Chrome or Edge developer tools. You can always find it, as this is the standard method. Look for the file with m3u8 extension. Alternatively, you can use the youtube-dl tool to automatically detect the m3u8 file when given a direct link to the webpage.

Next, copy the link of m3u8 file to youtube-dl command-line tool (download). It can download content from various sources beyond just YouTube. It will automatically download each segment and combine them using FFmpeg, then discard unnecessary parts. The tool may support the site you're interested in downloading from without requiring step #1.

If you encounter a stubborn site that generates 403 errors, try using Telerik Fiddler. This tool acts as a local proxy, capturing and saving any transmitted data, including video files. With Fiddler, you can download almost anything, except for DRM-protected content like Spotify.