How to Solve The HTML5 Video ‘File Not Found’ Error? [2023]

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

Are you having trouble with the ‘HTML5 video file not found’ error? Is your video not playing?

If so, don’t worry! 

This article will help you understand what HTML5 video is, the causes of the ‘file not found’ error, and how to solve it.

We’ll also provide tips on how to install HTML5 and fix Chrome download issues.

Key Takeaways

  • Most modern browsers support HTML5, so lack of support can cause the ‘file not found’ error.
  • To solve the issue, update the browser and check with the streaming service for compatibility.
  • The error can be caused by browser backend issues or lack of HTML5 support.
  • Try using an alternative browser like Chrome or Safari for better HTML5 support.


You may be wondering what HTML5 and HTML5 video files are and why you’re getting the ‘file not found’ error.

Well, HTML5 is a web technology that makes it easy for you to watch videos online without having to download them first.

It’s supported by most modern browsers, so if your browser doesn’t support HTML5, then that could explain why the file isn’t being found.

As for an HTML5 video file, this is essentially just a type of container format or video encoding that allows streaming services like Netflix or YouTube to deliver their videos over the internet. So if the streaming service doesn’t have a compatible version of your desired content in its library, then it won’t be able to find the video file and will throw up an error such as ‘HTML5 Video Not Found’.

To solve this issue, make sure your browser is up-to-date and supports HTML5, and check with the streaming service to see if they offer a compatible version of your desired content.

Overview of “HTML5 Video File Not Found” Error

The ‘HTML5 Video File Not Found’ error can be caused by browser backend issues or a lack of HTML5 support.

To fix this error, you should:

  1. Check if your browser supports the HTML5 videos.
  2. Update your browser to the latest version if it’s outdated.
  3. Make sure that your browser settings are correctly configured for online streaming videos.

If these steps don’t work, you should try using an alternative browser such as Chrome or Safari which provide better support for HTML5 videos and may offer more features such as hardware acceleration or extensions specifically designed for watching online videos.

Additionally, make sure that the video is not corrupt and try downloading another copy of it from a reliable source if possible.

What is an HTML5 video file?

An HTML5 video file is a type of video specifically designed to be played on web browsers and supported by all major browsers. It is an advanced element that allows for more control over the playback of videos, such as autoplay, pause, volume control, etc.

Compared to the older way of playing video on the web using the Adobe Flash plugin, HTML5 videos are easier and less annoying to use. The format used for HTML5 video files is usually in MP4 or WebM format; both are compatible with most browsers. Additionally, some websites might require additional codecs like H264, AAC or Ogg Theora to play properly.

If your browser does not support HTML5 video files or misses certain codecs when you try to play a video, then you may see an “HTML5 video not found” error message. In this case, it’s best to update your browser version and make sure all necessary codecs are available.

What causes “HTML5 video not found.”?

You may have encountered the ‘HTML5 video not found’ error and wondered what causes it.

This issue can arise due to various reasons, such as an issue with the website’s code, lack of browser support for HTML5 formats, incompatibility between different browsers, cookies and cache issues, or older videos that don’t support HTML5.

Let’s take a look at these potential causes in more detail.

1. Website issue

Webmasters can’t access the code of a video when it stops playing or glitches, potentially causing an HTML5 video ‘file not found’ error.

The issue is located in the website’s backend and requires attention from a developer to fix.

To solve this:

  • Reach out to the webmaster for help:
  • Explain what happened with the video error;
  • Describe any steps you have taken to troubleshoot;
  • Ask for assistance in debugging and resolving the problem.
  • Have the webmaster analyze your website’s code:
  • Check if any coding errors need to be corrected;
  • Identify any conflicts between HTML and CSS code.
  • Work with a developer if needed:
  • Have them review existing code for potential problems;
  • Make sure they understand how your website works before making changes.

2. Your Browser does not support html5

Older browsers may struggle to support HTML5’s latest features, leading to potential issues such as the ‘HTML5 Video File Not Found’ error.

To remedy this problem, it is important to ensure your browser is up-to-date and able to handle the newest version of HTML5. This can be done by checking for updates regularly or by downloading the most recent version of a supported browser.

Additionally, if you are using an old browser that is no longer supported, consider switching to one that does have full HTML5 support.

3. Incompatible Browser

To ensure a smooth experience, it’s important to make sure your browser is compatible with the latest version of HTML5. To achieve this, you should:

  • Check if your browser is up-to-date and installed with the latest version
  • Make sure that all plugins are enabled for smooth streaming
  • Clear all caches from time to time
  • If possible, use an alternative browser like Firefox for better compatibility.

Taking these steps will help you get a hassle-free experience with HTML5 video files on your preferred browser.

4. Your Cache And Cookies

If you’re still having trouble with playing videos, it could be due to the cache and cookies stored on your browser.

These elements are used by websites to store data that allows them to remember things like your preferences or items that you have added to a shopping cart.

If there’s an issue with the website’s cookies, it could prevent the video from playing correctly. To troubleshoot this, try going into incognito mode and playing the video again. This will bypass any malicious bug that might be preventing playback from occurring normally.

Additionally, you can clear both your cache and cookies as they might have become corrupted over time. By doing this, you can ensure that any old information is not causing issues when trying to play videos.

5. It’s Probably An Old Video

If you’re playing old video content that supports Flash Player and doesn’t support HTML5, then the video won’t play.

To solve this issue, there are a few steps you can take:

  • Clear your cache and cookies – this will help ensure that all of your browser’s data is up-to-date.
  • Check to make sure the video file is in the correct format – HTML5 videos should be in MP4 or OGV formats.
  • Try playing the video on a different browser – if the problem persists, it may be due to an outdated version of Flash Player.

These solutions should help you troubleshoot any issues with playing old videos that don’t support HTML5.

How to Fix HTML5 Video File Not Found?

You can solve the HTML5 video ‘file not found’ error by following these steps.

First, check if the video file is in the correct folder and that the filename matches exactly. If there is a mismatch, rename the file to match what’s listed on your page.

Next, ensure that you are using the correct video type for your browser; this means making sure it is .mp4 or an accepted file format of HTML 5 videos. If it’s not, convert it into one of those formats before uploading it to your site.

Thirdly, confirm that your server supports HTML5 videos by checking its settings.

Lastly, make sure you have a valid URL in your code and that all components of the link are correctly spelled out and working properly.

1. Use The Latest Browser Version




To ensure your browser can support HTML5 videos, you need to make sure you have the latest version of your browser installed. While most browsers auto-update, it’s a good idea to double-check that everything is up to date when you run into any HTML5 issues.

If you’re using Google Chrome, go to the menu and click on ‘Help’ and then ‘About Google Chrome’. If your version is out of date, it should prompt you with an option for ‘Update Google Chrome’. If this isn’t present, you’re all set!

Keep in mind that having the latest browser version is key for avoiding these kinds of issues and making sure your video experience runs smoothly.

2. Reset Cache and Cookies



Deleting your caches and cookies can help improve your browsing experience. This is the recommended solution if you’re experiencing HTML5 video not found errors.

To erase them, take these steps:

  1. Launch Google Chrome and click on the three dots at the top right corner.
  2. Select ‘Settings,’ then ‘Privacy and Security,’ followed by ‘Clear Browsing Data.’
  3. From the Advanced tab, select what you want to delete and click ‘Clear Data.’ You can choose from a range of time frames – from the last day to all time – to delete caches and cookies.

Be mindful during this process as important data may be lost in the process!

3. Toggle-off Hardware Acceleration




Toggling off the hardware acceleration can help improve your browsing experience. When you turn it off, the load of running graphic-intensive media is taken off from your computer’s Graphics Processing Unit (GPU). This can help speed up video loading in Google Chrome and may even fix the HTML5 video error.

To do this, open Chrome and click on the three dots at the top right corner then select ‘Settings’. Under ‘Advanced’, click on ‘System’ and toggle off ‘Use hardware acceleration when available’. Doing this will shift the load onto your CPU instead of GPU, helping it handle videos better.

Make sure to keep an eye out for any changes in performance as turning off hardware acceleration could impact how quickly other tasks are handled.

4. Use Safe Mode

To solve the HTML5 video ‘file not found’ error, try using safe mode to start your browser. In safe mode, hardware acceleration is turned off and some settings are reset. Additionally, all plugins and add-ons are disabled.

This can help you identify the root cause of the issue quickly as it eliminates any interference from websites or extensions that may be causing a problem with playing HTML5 video.

To get started in safe mode:

  • For Windows users – press the Shift key while clicking on the Restart button in the Start menu. Then select Troubleshoot > Advanced options > Startup Settings > Restart, and then press F4 to enter Safe Mode.
  • For Mac OS X users – restart your computer and immediately hold down the Shift key until the Apple logo appears. You will see “Safe Boot” at the login window instead of your usual username and password option. Log in to Safe Mode by entering your username and password.

Once you’ve entered safe mode, test if the HTML5 video plays without interruption.

If it does, examine which website, extension, or plugin may be causing issues for the normal operation of your browser. If this doesn’t help resolve the issue, you should try other solutions such as disabling hardware acceleration directly or resetting the browser cache memory before seeking more advanced assistance from IT support teams.

5. Download the Supporting Codecs of HTML5

If your browser still isn’t playing HTML5 videos correctly, you should try downloading the supporting codecs. Likely, your browser is not up to date or the website pages do not have a suitable video codec installed.

To ensure that all necessary codecs are available, communicate with the developer and install them. Doing this should help your browser become compatible with HTML5 videos.

It’s important to understand which type of codecs are required for HTML5 videos to play correctly on your device.

This can vary depending on where you’re streaming from and what type of content you’re trying to watch. Once you know the type of codec needed, locate and download it onto your device. Once done, restart your browser and try again – this should get rid of any errors related to unsupported video files on the site.

If this doesn’t work, there could be an issue with how the website page is configured or there could be another problem preventing the video from playing correctly. In such cases, contact a technical expert who can help resolve any underlying issues causing the error message ‘HTML5 file not found’ for smooth playback of HTML5 videos in future visits to the site.

6. Download the HTML5 Video itself

Downloading the HTML5 video may be the best way to fix the ‘file not found’ issue. To do so, you will need a reliable HTML5 video downloader. This will allow you to save your desired videos from the internet directly onto your computer.

Once downloaded, you can play the video without any errors or interruptions. It is important to use a trusted and secure source for downloading HTML5 videos to ensure that no malicious files are installed on your device while doing so.

Additionally, make sure that you have enough storage space available on your computer before downloading large files as this could cause further issues with playback or saving of the media file.

After downloading is complete, check again if the ‘file not found’ error has been fixed – if it has, then great! If not, there may be a more complex problem at hand which requires additional troubleshooting methods such as updating outdated drivers or reinstalling programs related to HTML5 video playback.

7. Open HTML5 Video in Incognito Mode





Try opening the HTML5 video in Incognito Mode to see if that fixes the loading error. This mode is available on Chrome, Firefox, and Safari browsers.

When you use this method, it will help you browse without interference from cookies and caches which can be the culprit of such errors. Here are a few steps to take:

  • On Chrome, press Ctrl + Shift + N keys to open up the browser in Incognito Mode.
  • On Firefox and Safari, look for the ‘New Private Window’ option instead of Incognito Mode.

If this method works, then it’s likely your add-ons or plug-ins causing this issue in normal mode; remove them accordingly or reset your Google Chrome settings to default.

In short, using Incognito Mode can be an effective way to fix the ‘HTML5 video file not found’ error quickly and easily. Try it out today if you’re having trouble with loading videos!

8. Disable any add-ons

Disabling add-ons could help fix the HTML5 loading issue. To do this, follow these steps:

  1. Open the menu in the upper right corner of your browser.
  2. Select More Tools> Extensions.
  3. Find the extension you want to block.
  4. Toggle off its switch.
  5. If it turns grey, that means it has been disabled.

This can be a solution if you encounter an Opera Your browser does not support HTML5 video messages.

You may also need to install plugins to support your browser. To do this:

  1. Press the Windows key + S.
  2. Search for ‘optional features’.
  3. Select Manage optional features.
  4. Find ‘Windows media player’ in the list.
  5. Click Install to add these components.

Keep in mind that there is no option for downloading codecs for HTML5, but sometimes installing certain components is necessary for proper playback of HTML5 videos.

9. Modify the video link

Changing the video link might help fix the issue.

If you’re having difficulty finding the HTML5 video, consider modifying its link. This simple change could be all you need to get the video up and running.

For example, switching from to helps ensure that your video will be playable on most devices and browsers. It’s also worth noting that this method works with both YouTube videos, as well as other streaming services and players which can be found online.

If you’re still experiencing trouble after trying these solutions, it may be a good idea to check if there are any compatibility issues between your device or browser and the video hosting website or player being used. Often these can cause unexpected errors when playing back videos online.

Additionally, some websites may require additional plugins for their videos to play correctly on certain browsers or platforms, so make sure those are up-to-date too!

With just a few quick adjustments, you should have no problem getting your HTML5 video running smoothly again in no time!

Why do I see this error in Chrome most often?

If you are using Google Chrome and encounter an HTML5 MP4 video, you may be met with the error message ‘file not found.’ This is likely because the browser lacks a specific MP4 codec.

Codecs are essentially a set of instructions that allow your web browser to decode audio or video files into something it can display on your screen. Without this necessary codec, your browser cannot interpret the file and therefore cannot play it.

To solve this issue, try changing the link of the video to one with a different format, such as Ogg Theora or WebM, both of which are supported by Chrome. If that doesn’t work, you may need to update your browser’s version or install plugins for additional codec support.

Can I install HTML5?

You don’t need to install HTML5, as it comes pre-installed in many modern web browsers. If you’re using an up-to-date browser like Google Chrome, then you already have the necessary tools to run HTML5.

All you need to do is make sure your browser is updated regularly to take advantage of all its features. You can also switch between different versions of HTML5 if your current one isn’t working properly. To do this, simply go into the settings and choose the version that best suits your needs.

Additionally, some websites may require specific plugins or add-ons for their content. In these cases, be sure that you install them before attempting to access the site’s content.

Finally, always double-check if your security settings are allowing HTML5 video playback on certain sites as they might be blocking it due to certain restrictions.

With these tips in mind, you should be able to get the most out of HTML5 without any worries!

What does HTML5 video not properly encoded mean?

You may have encountered an ‘HTML5 video not properly encoded’ message, which indicates that your browser isn’t compatible with the new format.

This error is common when playing videos on web pages and can be caused by a few different issues. Here are some steps to help you solve this issue:

• Make sure your browser is up-to-date so it’s capable of reading HTML5 video formats.

• Check for any plugins or extensions that could be blocking HTML5 videos from playing.

• Uninstall and reinstall any media players you’re using to try and play the video.

• Check your internet connection speed; if it’s too slow, HTML5 videos won’t play properly.

• Try switching browsers or devices to see if another one is better suited for playing HTML5 videos.

If none of these solutions works, then you may need to find an alternative way to view the video such as downloading it onto a device or streaming it from a different website.

With a little bit of troubleshooting, you should be able to get your HTML5 videos up and running in no time!

Which browser is HTML5 compatible?

Many popular browsers are compatible with HTML5, such as Chrome, Firefox, Safari, and Opera. All four have extensive support for HTML5 content and should work without any issues.

If you’re having trouble viewing HTML5 videos on your browser though, then you should try upgrading to the latest version of one of these. Doing so will ensure that you get the best experience when viewing HTML5 videos.

Additionally, if you feel like your current browser is too slow or isn’t working properly with HTML5 videos, you could switch to a browser specifically designed for this purpose – like Opera. It has built-in features that allow it to consume fewer resources and provide a great design overall. Plus it supports HTML5 video perfectly so there won’t be any issue with them in this case.

So if you’re looking for an alternative to your current browser that’s optimized for HTML5 video viewing then give Opera a try!

Frequently Asked Questions

Can I Use an HTML5 Video on My Website?

Yes, you can certainly use HTML5 video on your website. It’s an effective way to display multimedia content in a modern browser and is supported by most devices.

To make sure everything works correctly, you’ll need to check that the file format is compatible with whatever device your viewers will be using. You’ll also need to ensure that the correct file path is included in the HTML code of your webpage.

If everything looks good but still isn’t playing, it could be a ‘File Not Found’ error. In this case, you can try troubleshooting the issue or contacting tech support for assistance.

Is HTML5 Video Compatible With All Browsers?

Yes, HTML5 video is compatible with all major web browsers. It’s supported by Chrome, Safari, Edge, and Firefox, to name a few.

Generally speaking, these browsers will play your videos without any issues. However, there may be some exceptions depending on the type of browser and its version.

To ensure compatibility across all browsers, it’s best to provide multiple formats like MP4 and WebM for your videos.

How Do I Make Sure My HTML5 Video Works on All Devices?

To ensure your HTML5 video works on all devices, it is important to follow these steps:

  1. Ensure the appropriate coding for each device. Make sure you are using the correct file format for both audio and video that is supported by all devices.
  2. Check if any additional encodings or plugins are needed to be added to be compatible with certain browsers.
  3. Test your video on different devices before releasing it to make sure it works correctly.

How Do I Ensure My HTML5 Video Is Secure?

To ensure your HTML5 video is secure, you need to make sure the file is accessed through a secure connection. This means using HTTPS instead of HTTP when linking to the video.

Additionally, you can use encryption technologies such as TLS or SSL to protect the video data from unauthorized access and tampering.

It’s also important to host your videos on a trusted server that offers additional security measures, such as firewalls and anti-virus protections.

Lastly, make sure all user input is properly validated before it’s used in any queries against your database.

Taking these steps will help keep your HTML5 videos safe and secure.

How Can I Embed an HTML5 Video in My Website?

You can easily embed an HTML5 video on your website.

First, create a new page or post on your website and insert the code snippet provided by the hosting platform you’re using for the video.

Next, copy the URL of the video from the hosting platform and paste it into the code snippet.

Finally, click publish to make sure that everyone can access your embedded HTML5 video.

With these simple steps, you’ll be able to share videos quickly and easily!


In conclusion, HTML5 video files are an important part of the web experience, and when they don’t work as expected it can be frustrating. The ‘HTML5 Video File Not Found’ error can be caused by a variety of issues, but thankfully there are solutions to help you get your videos back up and running.

You’ll need to install HTML5 on your browser, fix any Chrome download issues, and ensure that your video is properly encoded. Thankfully, most browsers should be compatible with HTML5 so you won’t have to worry about compatibility too much.

With these steps, you should be able to get back to watching your favourite videos in no time!

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I am a computer engineer holding a bachelor's degree in Computer Science, complemented by a Master's in Business Administration from University of Strathclyde, Scotland. I currently work as a Senior IT Consultant in Melbourne, Australia. With over 15 years of...