How to Add Audio Track to MKV/MP4 on Windows

Quick Navigation

How to Add Audio Track to MKV/MP4:

1️⃣ Input Source File

2️⃣ Select MKV/MP4 Container

3️⃣ Add Audio

4️⃣ Export File

Wrap-up

FAQs

❓ How to add new audio to an .mkv video file? I have an .mkv file, and I want to import a new audio track to it without re-encoding the video or losing quality.
❓ I have two MP4 videos from the same source, but one has better image quality and the other has better audio quality. How can I replace the audio in the first video with the good one?

MKV and MP4 are the most commonly used formats for storing movies. A major advantage of these formats is their ability to hold multiple audio and subtitle tracks within a single file, and you can also replace existing tracks or add entirely new ones.

There are many tools available to assist you with this task. Next, I will demonstrate an easy and fast solution to add an audio track to MKV or MP4 video using a Windows-based program called WonderFox HD Video Converter Factory Pro. Just read and follow.

How to Add a Second Audio Track to an MKV or MP4 File

WonderFox HD Video Converter Factory Pro is a powerful yet easy-to-use video processing tool that can help you add audio tracks to basically any video.

When adding audio tracks to MKV or MP4 videos, it can directly remux the audio into the video container without re-encoding the video. Thus, it can export the file quickly while preserving the original video quality. Similarly, it can also extract audio or remove existing audio tracks.

Now, let me show you how to insert an additional audio track into an MKV or MP4 movie. Download Download the software (trial version) to get started.

Step 1: Import Video into the Program

Launch HD Video Converter Factory Pro and open Converter. Click + Add Files to add your movie into the program. You can also drag and drop the video directly.

Step 2: Select the Output Format

Open the Output Format list on the right. Click the Video tab and select MKV or MP4 as the output video format.

Step 3: Add Audio Track to MKV/MP4

Now, click the ➕ button next to the Audio track option to add a local audio file as the new track. You can also add multiple audio tracks to MKV or MP4. Just don’t forget to select the needed audio tracks from the Audio track drop-down menu.

💡 Make sure that the audio and the video are the exact same length so you don’t have an "audio out of sync" problem.

💡 It's recommended to open "Parameter Settings" and keep the audio settings consistent with the original. For example, if you import 128 kbps 44.1 kHz stereo AAC audio, you should also set the output audio encoder to AAC and change other settings accordingly. In this way, you can avoid audio transcoding and save time.

Step 4: Export the Final File

Click the ▼ button at the bottom to set an output folder. Finally, hit "Run" to export the file.

💡 The lightning icon ⚡ means the conversion will not re-encode the video data. But the conversion may also take a while, depending on how fast your disk can read and write data.

Wrap-up

That’s the whole process of how to add an audio track to MKV and MP4. Follow the steps and you can also add audio to WebM, MOV, etc. By the way, with the same tool, you can convert file formats to fix incompatibility issues, compress large videos, download movies and music from websites, record computer screen, and more. Install Install the software and try it out.

That’s all for now. I hope you like this post. Thanks for reading!

Hot Search: Remove Audio from MP4, Extract Audio from MP4, Add Subtitles to MP4, Add Subtitles to MKV

FAQs

1. Will adding an audio track to a video file affect the video quality?

No, adding an audio track to an MKV or MP4 file using WonderFox HD Video Converter Factory Pro will not affect the video quality. The software rewraps the audio into the video container without re-encoding the video, ensuring that the original video quality is preserved.

2. Can I add multiple audio tracks to an MKV or MP4 file?

Yes, you can add multiple audio tracks to an MKV or MP4 file with the help of WonderFox HD Video Converter Factory Pro. Simply follow the steps mentioned in this guide, and when you reach Step 3, click the "+" button to add additional audio files as tracks. You can then select the desired audio tracks from the drop-down menu.

3. Can I add any audio file format as an additional audio track to an MKV or MP4 file?

Yes, WonderFox HD Video Converter Factory Pro supports a wide range of audio file formats. You can add audio tracks in popular formats such as MP3, AAC, DTS, WAV, and more.