Fix HTML5 Video File Not Properly Encoded on Windows or Mac

Have you encountered playing a video that shows you the error HTML video file not found? This means the video file you are trying to play is not loaded. Other reasons may be your browser backend error or not supporting HTML5 video files. Some users may encounter this problem because their browsers cannot support the HTML5 format codecs. Having to experience this problem is really annoying. Thus, you do not need to worry because we have your solution. Read further to learn how to fix HTML5 video files not properly encoded.

Fix Video Not Properly Encoded

Part 1. Common Errors for HTML5 Videos Not Playing

HTML5 video is the new file for playing videos on the browser. HTML5 video files became the standard method of putting a video on a web page because the old way, Adobe Flash, was too complex for many users. But users sometimes encounter "HTML5 video not found." What does this indicate?

Here are some of the common errors why the HTML5 videos are not playing:

  • HTML5 support of your browser - This issue usually occurs because your browser might not support the HTML5 file format. If you are using the older browser versions, why can you not play HTML5 videos? In addition, your browser might not support the HTML5 codes, which may be why the "HTML5 video not properly encoded" error appears. Therefore, you should update your browser if you encounter this problem.
  • Website's backend issue - This issue is relevant to your website code. If a code glitch occurs, the video file cannot be accessed. This problem can only be fixed by the browser's developer or web admin.
  • Browser's Compatibility - Another reason the HTML5 video is not playing is your browser's compatibility. This error can appear due to compatibility issues of your video with some web browsers. For instance, a video does not play in Firefox but works completely well in Chrome.
  • Cookies and Caches - This cause is not often why webpages stop playing videos. Cookies contain malicious bugs and sometimes cause you to be unable to play HTML5 video files. To resolve this problem, check it by opening a web page in Incognito mode.
  • Videos with older contents - This error can happen when a user tries to play an old video file that supports Adobe Flash Player but does not support the HTML5 file format.

These are just some reasons why the HTML5 videos are not playing.

Part 2. How to Fix HTML5 Video Not Properly Encoded

Some videos or files can be corrupted for some reason. Some videos get corrupted by viruses or malware due to unusual turn-off windows while playing a specific file or video. But do not fret! In this part of the page, we will discuss the solutions on how to fix video not properly encoded.

1. Quickest Solution: Apeaksoft Video Fixer

There are solutions that you can do without installing software. However, those solutions are not 100% guaranteed to work. Therefore, if you want the best and easiest solution that can get you through, use Apeaksoft Video Fixer. Apeaksoft Video Fixer is among the most outstanding video fixers that enable you to fix an HTML5 video that is not encoded correctly. This application also fixes corrupted, unplayable, damaged, and choppy videos to a standard, smooth-playing video.

Moreover, it supports videos taken by different devices, such as cameras, smartphones, GoPro, and drones. What's also remarkable about Apeaksoft Video Fixer is that it allows you to upload a sample video, which will be the reference of the software for your output. It also supports fixing MP4, MOV, and 3GP videos in 4K and 8K video resolutions.

How to fix video not properly encoded using Apeaksoft Video Fixer:

Step 1 Download Apeaksoft Video Fixer on your device by clicking the Download button.

Step 2 Once the application is downloaded, click the + button on the left side to upload your corrupted HTML5 video. It will lead you to your files, then select the corrupted file and click Open.

Click Left

Step 3 Next, click the + button on the right side of the interface to upload a sample video. Then, click the Repair button.

Click Right

Step 4 In an instant, your video file is repaired successfully! You can now Preview your output, Repair Other Videos, or Save your file.

Preview Save Button

Easy, right? With just four simple steps, you can fix a poorly encoded video.

2. Download the Missing Codec

If the browser you are using shows "HTML5 Video not found.", it means that your browser is not updated or the webpages do not have the right video codec.

If you are in this situation, it would be best to communicate with the developer to solve your issue, and the developer can also help you download the missing codec.

3. Use the Latest Browser Version

Some versions of browsers do not support HTML5 videos. Therefore, you need to confirm whether the browser you are using is updated. Sometimes, web browsers are auto-updated, but you must check it manually if you encounter an error due to the HTML5 video.

Follow the steps below to learn how to check the latest updates for your Chrome browser:

Step 1 Open the Google Chrome browser and tick on the three dots in the upper right corner of your screen.

Three Dots

Step 2 From the drop-down list, select the Help option, then click on About Google Chrome.

About Google Chrome

Step 3 The Update Google Chrome option will appear if your browser is not up to date. Click it to update your browser. However, if it does not appear, your browser is updated.

Further Reading:

Why Videos Won't Play on Mac? Find The Cause and Solutions

Fixing Audio Codec Not Supported: Solutions and Guide

Part 3. FAQs about How to Fix Video Not Properly Encoded

Does Chrome support HTML5 videos?

Yes. You can view or play HTML5 videos on Google Chrome and other known browsers, such as Internet Explorer and Mozilla Firefox.

Does Safari support HTML5 videos?

Absolutely! The Safari browser supports HTML5 videos. But if YouTube does not play an HTML5 video, try uninstalling extensions.

Why is HTML5 MP4 video not working on Firefox?

The main reason might be Mozilla Firefox does not support the video encoder format that you are using. Firefox does not support all video files or video codecs. Usually, Firefox supports MP3, WebM, OGG, and Wave containers. If your MP4 container does not work, there might be wrong with the platform decoder for ACC and H.264 audio and video streams.


HTML5 videos are very popular because HTML5 has made it easy to watch videos on web pages. But, sometimes, the developer makes mistakes while embedding the videos on the web pages, which causes the "HTML5 video file not found" error. Therefore, if you want to solve your problem, you can use the methods specified above. However, if you want to find the issue and know how to fix video not properly encoded, download Apeaksoft Video Fixer now!

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