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Sometimes, malicious bugs in these cookies and caches can prevent a video from playing. Yes, cookies and caches that are supposed to ease video playing in their ways can be the cause of a video failing to play. Firefox and Opera Mini are more susceptible to this issue. If a video fails to play on a certain browser but plays on another browser, then it is a compatibility issue. Even an old Chrome browser may fail to play videos online. HTML5, compared to some browsers, is a recent codec that was developed to ease internet users. Truly, HTML5 is a widely supported video format, but if a browser is too old, issues are bound to arise. So, a mistake on the part of the developer of the website is a major culprit. Just so you know, one wrong character in a book of characters is enough to cause videos to not load properly on a website. One of the leading causes of this annoying issue is the website's backend. There are many reasons behind the "HTML5 video not found" issue, and they include: 1 Backend Problems with the Website What Causes the "HTML5 Video Not Found" Issue? And unlike Adobe Flash Plugin, almost all browsers support it, and it allows managing of video playback using control features such as auto-play, stop, pause, volume, and so on.
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It is a new standard approach for embedding a video on a web page because the earlier method of utilizing the Adobe Flash plugin to play video on the web is highly inconvenient and complicated. HTML5 video is a more powerful video element than Adobe Flash Plugin that allows you to watch videos on your browser.