When encountering an error where the HTML5 video file cannot be found, the problem is usually not that the video itself is corrupted, but that there is an error in path settings, format compatibility or server configuration. 1. Check whether the video path is correct, ensure that the path in the src attribute is spelled correctly and case-sensitive, and can directly access the browser to verify whether there are 404 problems; 2. Confirm that the video format is supported, it is recommended to provide MP4 and WebM formats to be compatible with different browsers, and use tools to convert the format if necessary; 3. Check the server MIME type configuration, Apache needs to enable mod_mime, and Nginx needs to add the corresponding configuration to correctly identify the video file type; 4. Solve cross-domain request issues (CORS), place the video under the same domain name or allow cross-domain requests in the server configuration, especially when using CDN. When troubleshooting, you should first check the console information, and then check the path, format and server settings details one by one.

When encountering an error in which the HTML5 video file cannot be found, the problem is usually not that the video itself is broken, but that the path is incorrect, the format is incompatible, or the server configuration is problematic. The focus is on troubleshooting these links, rather than redoing the entire page.

1. Check whether the video path is correct

The most common reason is that the path in src attribute is written incorrectly. If the browser cannot find the file at all, it will naturally report "not found".

• Make sure the path is spelled exactly consistently (case sensitive)
• When using a relative path, confirm that it is relative to the current HTML file
• You can directly enter the video path in the browser address bar to see if you can access it separately, for example: http://yourdomain.com/videos/demo.mp4

If you see the 404 page, it means there is indeed a problem with the path. Go back and check the value of <source src="..."></source> .

2. Confirm that the video format is supported

Common formats supported by HTML5 include MP4, WebM and Ogg, but the support level of different browsers varies. For example, Safari does not support WebM, and some old devices may not be able to play H.265-encoded MP4.

You can write this way:

 <video controls>
  <source src="demo.mp4" type="video/mp4">
  <source src="demo.webm" type="video/webm">
  Your browser does not support video playback.
</video>

• It is recommended to provide at least two formats: MP4 and WebM
• Converting formats using HandBrake or ffmpeg is simple
• If there is only one format, make sure the browser used by the target user can support it

3. Check the server MIME type configuration

Some servers do not set the correct MIME type for file types such as .mp4 , .webm , etc., which causes the browser to refuse to load.

Common Situations:

• Apache server needs to enable mod_mime
• Nginx needs to add configurations like the following:

 location ~ \.mp4$ {
    types {}
    default_type video/mp4;
    add_header Content-Disposition "inline";
}

If you are using static hosting services such as GitHub Pages and Netlify, you generally don't need to worry about this. But if you set up a server yourself, this point is easy to ignore.

4. Cross-domain request issues (CORS)

If your video file is loaded from another domain name, it may fail to load due to cross-domain restrictions.

Solution:

• Put the video file under the same domain name (easiest)
• Or the server settings allow cross-domain requests (CORS), such as adding a header:

 Access-Control-Allow-Origin: *

This is not very common, but you need to be careful when loading video resources using CDN.

Basically these common reasons. When an error occurs, first look at the console information, and then check the path, format and server configuration one by one. Not complicated but it is easy to ignore details, especially the path case and server settings.

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