How to Merge MP4 and M4A Files Together?

Author: Vita
Publish date
Updated on Mar 22, 2024
Combine MP4 and M4A
  • Download Download the powerful MP4 M4A merger and follow:
  • Step 1. Open the Converter and add MP4 files.
  • Step 2. Change the output format to MP4.
  • Step 3. Add M4A audio files to your videos.
  • Step 4. Press Run to export videos with new audio.
Quick Navigation
How to Merge MP4 and M4A Files into One?
Way 1. HD Video Converter Factory Pro
Way 2. FFmpeg
Way 3. Online Video Editor

Many people choose to download the video and audio files separately and then join them into one to save storage space. To do such a combination, professional audio-and-video joining software is necessary. The following article will introduce three useful programs to help you merge MP4 and M4A files. Read on and follow the tutorials.

Way 1. HD Video Converter Factory Pro (Recommended)

One of the best audio and video mergers is WonderFox HD Video Converter Factory Pro. It can merge video and audio files into one in high output quality without watermark. Besides adding M4A to MP4, it can help you put WAV, MP3, etc. Over a video file with simple clicks. Using the program, you can easily add your desired audio file to the video or replace the original audio track.

Additionally, HD Video Converter Factory Pro has a built-in downloader, enabling you to download music or videos from websites simply via URLs.

HD Video Converter Factory Pro
Easy & Fast MP4 M4A Joiner

HD Video Converter Factory Pro makes it easier than ever to add audio tracks to video and export files in high quality. Download this handy and effective MP4 M4A merger. Let’s get started!

Free download Download for Free
Free download Download for Free

Free downloadFree download the program on your PC and follow the steps.

Step 1. Add MP4 Video Files

Start HD Video Converter Factory Pro and open the Converter. Click Add Files to import the MP4 videos that you want to merge with M4A audio. Or directly drag and drop the files therein.

Import MP4
Import MP4

Step 2. Select MP4

Click the format image on the right side. Navigate to the Video tab and choose MP4 as the target format.

Choose MP4
Choose MP4

Step 3. Combine MP4 and M4A

Click the second plus "+" icon below the MP4 video to add a local audio file: select the .m4a audio you want and click "Open".

Tip. In step 2, the output container format has been set as MP4, which supports multiple audio tracks in one video. So you can add more audio files to your video, and remember to tick the checkbox for selecting your desired soundtracks.

Add M4A to MP4
Add M4A to MP4

Step 4. Export the Final Files

Specify an output path to store the new files. Then press Run to merge MP4 and M4A files together. With hardware-accelerated encoding, the process can be completed at a lightning-fast speed.

Finish the Process
Finish the Process
HD Video Converter Factory Pro
More than an MP4 M4A Merger
  • Batch convert video to 500+ formats and devices;
  • Extract and remove audio from video;
  • Reduce audio/video file size in flexible ways;
  • Trim, crop, add subtitles, change parameters...
Free download Download for Free
Free download Download for Free

Way 2. Join MP4 and M4A with FFmpeg

FFmpeg is an open-source program that can handle audio, video, and other multimedia files with ease. It can play some media files directly and edit videos like combining, converting, and cropping, with relative command lines. However, many people don’t have the knowledge of the command line in FFmpeg, which may be a big challenge.

But don’t worry. Below shows you how to combine MP4 and M4A with FFmpeg. Here, we use the two files ‘videoplayback.mp4’ and ‘videoplayback.m4a’ as an example. (Normally when you finish downloading video and audio files, you will get something like this.)

Merge M4A and MP4 with FFmpeg
Merge M4A and MP4 with FFmpeg

Step 1: Download and install FFmpeg from this site:

Step 2: Open the Command Prompt window in your downloads folder and run the following command:

In case of MP4 format (all, except 1440p 60fps & 2160p 60fps):
ffmpeg -i videoplayback.mp4 -i videoplayback.m4a -c:v copy -c:a copy output.mp4

When the merging is finished, you will get a new file named “output.mp4”.

Note: If you fail to merge MP4 and M4A into a single MP4 file, check whether the command line you entered is correct or not.

Way 3. Combine MP4 and M4A Online with Kapwing

Kapwing is a popular video processing toolkit online. A large number of users create, edit, and grow their content on every channel of Kapwing. Compared with other simple online video editors, Kapwing offers more professional editing options as well as recording features. Thus, it may be difficult to operate for beginners.

Merge MP4 with M4A Online
Merge MP4 with M4A Online

How to join MP4 and M4A in Kapwing?

Step 1: Visit the site:

Step 2: In the "Media" part, click "Add Media" to upload the MP4 and M4A files you want to merge together. And tap on the imported files to add them to the timeline.

Step 3: Adjust the audio track to be the same length as the video track.

Step 4: Click "Export Project" at the upper right to export the file as MP4.

Step 5: When it’s done, click "Download file" to save the file to your computer.

Note: There will be watermarks on videos that are processed by Kapwing. You can upgrade to its Pro version to remove the watermark from your project.

In Summary

That’s all about the three methods to merge MP4 and M4A files into one. By contrast, HD Video Converter Factory Pro is the best solution for adding an audio track to videos. It’s easier, faster, and more straightforward than FFmpeg and Kapwing, supports more output presets, and has no watermarks. You can downloaddownload it to have a try. Thanks for reading!

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