What is MIME type "video/h261"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

video/h261 is a MIME type for video files encoded with the H.261 compression standard. It was designed to reduce file size and bandwidth use in video applications.

Compression Method: H.261 compresses video by removing unnecessary data, enabling smoother transmission over limited-bandwidth networks.
File Format: Files using this codec typically have the extension H261.
Primary Use: It is used in early video conferencing, streaming, and legacy broadcast systems.
Legacy Role: While modern codecs offer improved quality and efficiency, H.261 was essential in shaping video compression standards during its time.

This MIME type tells systems how to handle the video data properly, ensuring that applications process and play the content correctly. For more details about file formats and codecs, you can visit external resources such as ITU H.261 Specification.

Associated file extensions

.h261

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: video/h261

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="video/h261">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'video/h261');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.h261

FAQs

Can I play video/h261 files in a modern web browser?

No, modern browsers (Chrome, Firefox, Safari) do not natively support the H.261 codec in the HTML5 <video> tag. To display this content on the web, you must convert the file to a standard format like H.264 (video/mp4) or WebM.

How do I open a file with the .h261 extension?

You need a media player that supports legacy codecs, such as VLC Media Player or MPlayer. Most default system players (like Windows Media Player or QuickTime) will not recognize this format without installing specific codec packs.

How do I configure Apache to serve video/h261 files correctly?

You should add the MIME type definition to your .htaccess file or main server config. Insert the line AddType video/h261 .h261 to ensure browsers and players recognize the file type upon download.

What is the Nginx configuration for the H.261 MIME type?

In your Nginx configuration (usually mime.types or inside a server block), add the mapping inside the types directive. Use the syntax: video/h261 h261; to link the MIME type to the extension.

How can I convert an H.261 file to a modern MP4?

The most effective tool for this is FFmpeg. You can run the command ffmpeg -i input.h261 -c:v libx264 output.mp4 to re-encode the legacy video stream into a widely compatible MP4 file.

Why would I encounter a video/h261 file today?

These files are typically found in legacy archives related to early video conferencing or ISDN telecommunications data from the early 1990s. It is rarely used for new content creation due to the superior efficiency of modern codecs like H.264 and HEVC.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.