Muxer Video & Audio

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Muxer Video & Audio is a browser add-on that allows you to mux video-only and audio-only files and produce a video file with embedded audio.

The web player uses the FFmpeg software, which is compiled from C and C++ and translated to JavaScript using Emscripten. Emscripten is a source-to-source compiler that converts native C/C++ code to JavaScript.

To use this plugin, simply open the app UI and drag input files (video & audio) into it. Then, to add the mux command, click on the – Command – button, followed by the – Mux – button to begin the process. A preview of the completed video will be displayed once muxing is finished, as well as a option – Download.

Muxer Video & Audio

Features of Muxer Video & Audio

  • Video and audio files may be dragged and dropped into a standalone popup window.
  • It has a display to notify you of continuing operations.
  • It can mux almost all popular video and audio formats (.webm, .mp4, etc.).
  • This extension uses two different types of encryption, depending on what you’re doing. It’s available for Firefox, Chrome and Opera browsers on all platforms.


1. What are Muxer Video & Audio extensions?

The Muxer Video & Audio is a browser plugin that allows you to mix video-only and audio-only files in your browser and produce a video file with integrated sound. It makes use of the FFmpeg library, which is compiled from C and C++ into JavaScript using Emscripten. Emscripten is a source-to-source compiler that converts native C/C++ code to JavaScript language. Simply open the app UI and drag any video file to the desired location in the app (in the top left corner). Open the file by double-clicking it. To begin, select the audio file and convert it to MP3 format (top right corner). Then, in the input area, type your FFmpeg command and press the – Mux – button to start the job. When muxing is complete, a button will appear at the top toolbar of the app allowing you to download the final video file. Please note that depending on the volume size of your source files and their file extensions (some file extensions may take longer to mux than others), muxing can take some time. A preview of the produced video will be displayed in the UI after the muxing process is completed. The preview may be closed or opened at any time. Please keep in mind that, by default, the output video’s extension is similar to that of the input video file. For example, if you drop a .mp4 video into the app, its final file extension will be .mp4 (unless you use an FFmpeg command to modify it).

See also  Converter Video

2. How do I use the Muxer Video & Audio extension?

Simply open the app UI, then drag and drop input files into it (rectangular areas at the top). Then input any muxing FFmpeg command into the input field and press the – Mux – button. If you’re not familiar with FFmpeg commands, you can utilize the – Command – option in the UI as a separate button above the input field. You may also look for and discover your desired FFmpeg mux commands on a search engine. To execute your command, type it in the input field and press the – Mux – button after. Also, make sure the FFmpeg library has the necessary codecs for the input and output file extensions before executing any command. Simply enter -codecs into the input area (command area) and press the – Mux – button to get a list of all currently available codecs in this version of FFmpeg. The app console displays all the current commands. The log may be cleared by pressing the – Clear – button in the UI. In the app console, all of the previous commands are shown. Furthermore, at the conclusion of the operation, the total time spent executing the command will be displayed on screen. When muxing is completed, there will be download and preview buttons in the top toolbar.

3. How does the Muxer Video & Audio extension work?

This add-on makes use of the freely available and open-source conversion tool called FFmpeg. FFmpeg is a C and C++ software originally written. However, only JavaScript is acceptable in the browser. As a result, this extension utilizes an Emscripten-compiled version of the FFmpeg library. Emscripten is a compiler project that has produced a compiled version of the FFmpeg codebase. Please see this Wikipedia article for additional information on Emscripten compilers. This is a Javascript-based FFmpeg fork that supports all of the original commands. However, not every codec is supported yet. As a result, please verify for available codecs before utilizing the addon. It’s also worth noting that because this library is built on Javascript, it may not have the same performance as C and C++ versions. Since it’s hosted in a browser and has fewer resources than the native C FFmpeg app. But, according to our tests, it performs adequately for basic muxing operations.

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4. How to turn OFF the extension?

When the application UI is no longer visible, the add-in is completely OFF and unused (RAM/CPU) on your system. Also, if you wish to totally disable the plugin, go to the extensions area in your browser and then click the disabled button there.

5. Is the Muxer Video & Audio extension available on mobile firefox?

Yes, this add-on is compatible with all web browsers and platforms, including mobile Firefox and Opera.

6. How do I refresh the app user interface?

When you first launch the app, you’ll notice a reload icon in the upper right corner. Please click this button to refresh the UI. Also, be aware that refreshing the UI will cancel any active operations and reset the optimization process.

7. Download converted video file

After the conversion is complete, a download button will appear on the top toolbar in the UI. Please select the button to save the item to your computer. In your browser, the default download location is where you’ll find it.

8. What is the best way to download the converted file?

To alter the download location, go to your browser’s settings page and search for the download area. You may modify the downloaded path here. All of your downloads in your browser will be relocated globally.

9. What happens if I forgot to add the output file extension for the FFmpeg command?

If you don’t attach the file extension of the output file, which is what we’ll do in this recipe, FFmpeg will fail to combine the sources. As a result, if no output file extension is recognized, the program automatically adds – .mkv – as the file extension and proceeds with the muxing process. MKV is a generic media container that may be converted to any format afterwards. It can also be viewed online using HTML5’s video element.

See also  Sound Setting

10. Is this plugin comparable in performance to native FFmpeg applications?

No, since this extension utilizes FFmpeg in the browser, it runs more slowly than native FFmpeg applications/libraries. However, using the plugin is very simple (in fact, much easier than the native FFmpeg command-line tool). Simply include it in your browser and it will begin functioning immediately without the need for any additional plugins. The native FFmpeg library has several quirks that might be challenging to deal with on certain platforms. This add-on is compatible with all major browsers and operating systems. For extremely large video files, the native FFmpeg library is still required. This add-on is only useful for little changes (smaller video files).

11. Privacy Policy for Muxer Video & Audio

To access the privacy policy for this extension, please click here.