How to Solve The HTML5 Video ‘File Not Found’ Error

Are you unable to watch videos on Vimeo, YouTube, or other websites due to the ‘HTML5 Video: File Not Found‘ error? It could be a web page backend issue or your browser does not support HTML5 videos.

This post shares how best you can tackle the HTML5 video error problem and make your videos playable again in any browser.

What is a HTML5 video file?

How to Solve The HTML5 Video 'File Not Found' Error

HTML5 is an enhanced version of HTML (HyperText Markup Language). As the next level to HTML, HTML5 has incorporated video and audio specifications, which now allows users to watch videos online without any plugins. The webmasters need to use special HTML5 coding and include WebM, MP4 and OGG formats on their web pages. Before HTML5 videos were only played using the Flash Player.

You can view HTML5 videos on all popular browsers such as Google Chrome, Internet Explorer, Mozilla Firefox, and Safari.

What is HTML5 Video “File not Found” Error?

If you encountered “HTML5 video not found” error while playing a video on any website then it implies your browser doesn’t support the HTML5 format codecs or your browser doesn’t have the proper video codec installed.

Why do you get an ‘HTML5 Video File Not Found’ error?

There are could be multiple reasons that could be held responsible to get an ‘HTML5 Video File Not Found’ error –

  1. Website’ Issue –
    HTML5 video error occurs when you try to watch a video embedded on a web page. It is mostly a website backend issue and is fixed by the webmaster or the developer of the site.
  2. Browser’s Issue –
    However, sometimes the problem could also be the browser. Below mentioned are there scenarios related to the browser –
  • The browser in which you are trying to view the video may not support HTML5 format codecs. You can check this, by playing videos on multiple browsers.
  • If you are able to watch the web page video in other browsers, it is the HTML5 compatibility problem with a particular browser. For example, a web page video may not open in Firefox and throw HTML5 video error. However, in Chrome it may play perfectly.
  • The possibility is also that the browser’s cache and cookies do not let the web page videos play. You can confirm this, if the video plays fine in the new Incognito window.

Thus, there are various reasons due to which the ‘HTML5 video not found’ error occurs.

Also read Error Solved: 5 Common Video Errors

How to fix ‘HTML5 Video: File Not Found’ error

There are various ways to fix HTML5 video error. We suggest you to follow the order given here while troubleshooting – from simpler to complex solutions.

5 Ways to solve ‘HTML5 Video File Not Found’ error

  1. Update your browser
  2. Remove cookies and cache
  3. Toggle hardware acceleration
  4. Start the browser in Safe Mode
  5. Download supporting codecs

Method 1 – Update your browser

Not all web browsers support HTML5 videos. Ensure you are using an updated version of the browser.

Below are the popular browser versions that support HTML5

ElementBelow are the popular browser versions that support HTML5 - Google ChromeBelow are the popular browser versions that support HTML5 - Internet ExplorerBelow are the popular browser versions that support HTML5 - Mozilla FirefoxBelow are the popular browser versions that support HTML5 - SafariBelow are the popular browser versions that support HTML5 - Opera
<HTML5 video>Google ChromeInternet ExplorerMozilla FirefoxSafariOpera
 Version 25 partially supportsVersion 9 and 11Version 2 to 20 partially supportsVersion 3.1 to 6 partially supportsVersion 10.1 to 12.1 partially supports
 Version 26 to 70 completely supports Version 21 to 63 completely supportsVersion 6.1 to 12 completely supportsVersion 15 to 53 completely supports

To check if you’re using an updated version of Chrome do the following:

  1. Open Google Chrome and click on the three vertical dots on the top-right corner
  2. Click Help > About Google Chrome
  3. If you see an option Update Google Chrome, click on it. If not, your Google Chrome is updated

Similarly, you may check and update other browsers too.

Method 2 – Remove cookies and cache

Clearing the cache and cookies in the browser helps most of the time. Although, cache and cookies stored in a browser’s directory serve to provide a better user experience, but sometimes it leads to errors while playing multimedia files. Try to view the video again after deleting the cache, cookies and browser history.

In Google Chrome, you can do the following to delete cache and cookies:

  1. Open Chrome and click on the three vertical dots on the top right
  2. Click to follow Settings > Advanced > Privacy and security > Clear browsing data
Google Chrome Clear Browsing data

Figure: Under Google Chrome Settings click on ‘Clear browsing data’

  • Choose and tick the checkboxes: Browsing history, Download history, Cookies and other site data, and Cached image and files
Click the checkboxes to Clear all cache data in Google Chrome

Figure: Tick the checkboxes to clear all cache data

  • To clear the entire cache, select All time in the time range dropdown
  • Click Clear data

Now restart your computer and try to play video in your browser.

For steps to remove cache and cookies in other web browsers, visit:

Method 3 – Toggle hardware acceleration

Hardware acceleration helps in opening graphics-intensive media like games and videos etc., in the browser.

When you turn-off the hardware acceleration in a browser, only your computer’s GPU (Graphics Processing Unit) will be used to process all the graphics-intensive media. This lowers the load on the browser and may fix HTML5 video error.

In Google Chrome, you can disable hardware acceleration by following the below steps:

  1. Click on the three dots on the right corner in Google Chrome
  2. Click to follow Settings > Advanced > System

Google Chrome Click on 'System' under 'Settings' in Chrome

Figure: Click on ‘System’ under ‘Settings’ in Chrome

  • Toggle-off the Use hardware acceleration when available option 
Google Chrome Toggle-off the 'Use hardware acceleration when available '

Figure: Toggle-off the ‘Use hardware acceleration when available ‘

  • Restart Chrome

Now try to your videos in browser. It should not give ‘HTML5: Video file not found’ error.

You can disable hardware acceleration for other browsers too in their setting.

Method 4 – Start browser in Safe Mode

Starting the browser in Safe Mode usually resolves many problems. Safe Mode may not fix the HTML5 issue, but you may know the cause of the problem and find a solution.

So what happens to the browser in Safe Mode?

  • In Safe Mode hardware acceleration is automatically turned-off
  • Few settings are reset
  • All add-ons, plugins etc., are disabled

If the video plays without any error or interruption in Safe Mode, it means any of these settings in your browser could be creating the problem. You can change those settings or disable the plugins or extensions that are creating the HTML5 video error.

Method 5 – Download HTML5 supporting codecs

An ‘HTML5: Video file not found’ error indicates either the browser you are using doesn’t support HTML5 or the webpage doesn’t have the proper video codec.

You may contact the website’s developer to install HTML5 supporting codecs for all the three WebM, MP4, and OGG formats.

In case you are an Internet user who witnesses this error, then ensure using the updated browser that supports HTML5. Further, if the error persists, try the other ways given in this post to fix the issue.

Is Video not Playing in Firefox or Chrome ?

What worked for some, might work for you too!

Here are couple of solutions, which various users found helpful when their HTML5 videos didn’t play in any browser.

Is video not playing in Firefox or Chrome ?
 ‘HTML5 video won’t play in Chrome’

 ‘I had a 1920×1080 video, which won’t load
under Chrome but worked in Firefox. After a lot of searches, I found that in the
first few streams of 1912x1088p, Chrome won’t play it.

What I did: To fix the issue I resized the video to 1920x1080p. HTML5 video now played in Chrome too.



'HTML5 video won't play in Firefox'

 ‘HTML5 video won’t play in Firefox’

 ‘I had HTML5 videos that would not play in Firefox. I was using an updated browser and removed cache and cookies too, but no help.

What I did: What worked for me was updating my video drivers. I have the NVIDIA GTS 240 driver on my computer. Downloaded and installed the latest one. Next, restart the computer and now Chrome 38.0.2125.77 started playing HTML5 videos again on YouTube, Vimeo, and others.


Is your video corrupt? Repair it with Ultimate Video Repair Tool 

When the local video files saved in the hard drive, SD card, USB flash drive etc., are broken, not playing, or showing any error while opening, it indicates a corrupt file. To fix such not playing or error generating videos use Stellar Repair for Video — an efficient tool to fix any sort of video corruption including blurry, grainy, stuttering, black screen, no sound or out-of-sync videos.

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Wrapping Up

HTML5 eases watching videos on the Internet. However, when
webmasters do not properly embed HTML5 videos on their web pages, it leads to HTML5 video playing error.

As an Internet user, you can check if your browser is updated and supports the HTML5 formats. Further, try the other ways given above like clearing cache and cookies, disabling extensions or plugins to solve the ‘HTML5 Video: File Not Found’ error.

Hope you found this post helpful.

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