They could sent different javascript to different users depending on a million of variables.
#Youtube data extractor software#
Also, just because I got Javascript with just these 4 cases, it doesn't mean that you will get the same. A YouTube scraper is a piece of software that can help you extract relevant data from YouTube, so that you can get the information that you need to track down. But taking a glance at the minified mess this is and how much code there is, it is hard to be sure that there is no situation in which it leaks any information to a server. None of these snippets looks suspicious and appears to be plausible use of this feature in the context of a video player.
It checks if the first pixel of the canvas is a greyscale color. b=b.getImageData(0,0,1,1).data return b=b&b=b AI-Powered Web Scraping Tool & Web Data Extractor ScrapeStorm AI-Powered Visual Web Scraping Tool Built by ex-Google crawler team. I suspect it's part of the code which creates the background for the "this video can not be displayed" error message. This replaces the whole image with random gray noise and writes it back to the canvas. This appears to check the overall brightness level of a part of the image and detects if it is "bright" or "dark". getImageData function which is used to extract canvas data in the file base.js. That makes auditing it next to impossible. Youtube includes quite a lot of Javascript code, and most of it is heavily minified. That information can then be sent back to the server.
While there are lots of legitimate uses for this, it can also be used to detect subtle differences in how different web browsers render images, videos and text to gain information about the users web browser. Among many other operations, it can draw images or videos to the canvas and then manipulate them on a pixel-by-pixel level. Geekersoft YouTube Downloader can help you download YouTube videos. First, why does a website "attempted to extract HTML5 canvas image data"? The HTML5 canvas element allows manipulations of 2d images with Javascript. How come watching a YouTube video takes a lot less data than watching a video from.
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