Can FFmpeg Convert MKV to MP4?

If you are looking for a powerful and versatile tool to convert your MKV (Matroska) files to MP4 (MPEG-4) format, then FFmpeg might just be the solution you need. FFmpeg is a command-line tool that allows you to manipulate and convert various multimedia formats. In this article, we will explore how you can use FFmpeg to convert MKV files to MP4.

Installing FFmpeg

Before we delve into the conversion process, let's first make sure you have FFmpeg installed on your system. FFmpeg is available for multiple platforms including Windows, macOS, and Linux. You can easily download the latest version of FFmpeg from their official website (

After downloading FFmpeg, follow the installation instructions specific to your operating system. Once FFmpeg is installed, you can proceed with the conversion process.

Converting MKV to MP4 with FFmpeg

To convert an MKV file to MP4 using FFmpeg, you need to open your command-line interface (Terminal, Command Prompt, etc.) and navigate to the directory where FFmpeg is installed.

  1. Open your command-line interface.

  2. Navigate to the directory where FFmpeg is installed. For example, if you installed FFmpeg in the default location, you can use the following command to navigate to the FFmpeg directory in Windows Command Prompt:

    cd C:\ffmpeg\bin
  3. Once you are in the FFmpeg directory, you can use the following command to convert the MKV file to MP4:

    ffmpeg -i input.mkv -c:v libx264 -crf 23 -c:a aac -b:a 192k output.mp4

    Let's break down this command:

    • -i input.mkv specifies the input MKV file that you want to convert.
    • -c:v libx264 sets the video codec to libx264, which is a popular choice for MP4 files.
    • -crf 23 determines the video quality. A lower value results in higher quality and larger file size, while a higher value results in lower quality and smaller file size.
    • -c:a aac -b:a 192k sets the audio codec to AAC with a bitrate of 192kbps.
    • output.mp4 is the name of the output MP4 file.
  4. After running the command, FFmpeg will start converting the MKV file to MP4. The conversion progress will be displayed in the command-line interface.

  5. Once the conversion is complete, you will find the output MP4 file in the same directory as the input MKV file.

Additional Options

FFmpeg provides various additional options to further customize your conversion process. For example, you can specify the video resolution, adjust the audio quality, or add subtitles to the output file. Refer to the FFmpeg documentation for more information on these options and how to use them.


FFmpeg is a powerful command-line tool that can easily convert MKV files to MP4 format. With its extensive capabilities and flexibility, it provides a versatile solution for multimedia conversion tasks. By following the steps outlined in this article, you can quickly convert your MKV files to MP4 and enjoy them on various devices and platforms.

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