How to Merge MP4 and M4A Files? Two Simple Solutions!

In this fast society, many people pursue efficiency. Therefore, when they download media files, they choose to download videos and audios separately, which can save much time. And the video and audio are usually in MP4 and M4A format separately. After successfully downloading the media files with a large size, there is another question: How to merge MP4 and M4A files? I found some people recommend FFmpeg on the Internet. To save your energy, this guide will tell you how to combine MP4 and M4A into one with FFmpeg. Apart from that, we also introduce its best alternative: Joyoshare Video Joiner.

Part 1. Merge MP4 Video and M4A Audio with FFmpeg

FFmpeg is an open-source project to handle audios, videos, and other multimedia files, like joining M4A and MP4 files together. Many people like to use it due to its free license. But at the same time, there is another challenge: FFmpeg is a command-line based program and many people doesn't have that kind of knowledge. That means you need to search some relative commands to combine, convert, or crop videos. Now, let me tell you the steps to merge MP4 and M4A by FFmpeg.

Take "videoplayback.MP4" and "videoplayback.M4A" as an example.


Step 1: Download and install FFmpeg in your computer;

Step 2: Step 2: Open the Command Prompt window in your download folder and run the command below. 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

Note: If you input the wrong command, then FFmpeg won't work to join MP4 and M4A into MP4. This process is kind of difficult to operate. So, you can consider its alternative recommended in the following parts.

Part 2. Combine MP4 and M4A Files via Joyoshare Video Joiner

Different from FFmpeg, Joyoshare Video Joiner Joyoshare Video Joiner doesn't need any commands to join MP4 and M4A into one. With an intuitive interface, you can add M4A to MP4 fast and easily. Joyoshare supports a great variety of audio and video formats, like MP3, FLAC, AIFF, MP4, WMV, MKV, AVI, and so on. If the videos are the same format, you can join them without data loss. For example, you combine MP4 files without damaging any quality.

Apart from its merging function, you still can trim, edit, and convert videos or audios. Besides, you can extract audios from videos. Moreover, Joyoshare differs from other software. It provides two merging modes: High-Speed mode and Encoding mode. The first one can cut and combine videos and audios fast and losslessly. The second one allows you more choices to edit videos, like cropping videos, adjusting brightness and hue, inserting subtitles and unique watermarks, etc.

Good Points of Joyoshare Video Joiner:

Merge MP4 and M4A easily and losslessly

Export videos at 60X faster speed

With a user-friendly interface

Run both on Windows and Mac devices

  • How to combine MP4 and M4A via Joyoshare:

  • Step 1Import MP4 video to Joyoshare Video Joiner

    Download and install a suitable version of Joyoshare Video Joiner (Windows or Mac), and then launch it. Next, you should add MP4 files to Joyoshare. There are two ways: Click the Open File to select MP4 video; Drag and drop MP4 to screen on the left.

    add mp4 to the program
  • Step 2Select one joining mode and the output format

    On the right side of the bottom, there is a Format button. Click this button to pick one mode. Joyoshare provides you two modes: High-Speed mode and Encoding mode. The former can cut and combine audios or videos without quality loss only if there are in the same format. Here we want to merge audio and video, so we should choose the latter. Encoding more provides more options to choose a file format and customize quality, resolution, and codec.

    choose merging mode and output format
  • Step 3Trim MP4 files as you like

    After choosing the export format, return to the main interface. There are two ways to split videos. You can move the yellow sliders on the bottom to remove the unwanted sections of your video. That's the first way. As for the second, I will introduce it in step 4.

    cut mp4
  • Step 4Combine M4A and MP4 files

    Click the Edit button to open Joyoshare's built-in video editor. Here you can also cut your MP4 video more accurately. Then you can edit MP4, like adjusting its rotation, adding some video effects and frames, inserting subtitles, and so on. Next, the most important part comes. Click the Audio button in this editor. Then press on the File button to add M4A audio to MP4 video.

    edit mp4
  • Step 5Export MP4 with M4A audio

    Before exporting the MP4 video inserted M4A, you should preview the merged video. Check for whether the M4A track is there. If it is, click the Convert button to export the merged MP4 files.

More Introduction:

Nowadays, many social media platforms have used a DASH mechanism (Dynamic Adaptive Streaming over HTTP). Like the favorite YouTube you watch videos a lot, this website also introduces DASH for 1080p and 480p videos.

DASH is an adaptive bitrate streaming technology where a multimedia file is partitioned into segments and delivered to a client using HTTP. Therefore, when you download the media files to your computer, you usually get one video.

That is why so many people search for this topic we discussed here: MP4 and M4A joiner to merge the separated multimedia files.

Except for FFmpeg and Joyoshare Video Joiner, if you have any other better choice, welcome to leave a comment!


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