This post explains how to fix the “converting MKV to MP4 no sound” issue. It covers common causes, such as missing audio tracks or conversion errors, and introduces several fixes. Also, it provides solutions like adjusting VLC media player settings or using MiniTool Video Converter and FFmpeg for conversion.

MKV is a video container format that can store video, audio, subtitles, and images in a single file. MP4 (MPEG-4 Part 14) is also a multimedia container format for video, audio, subtitles, and images. Many users convert MKV to MP4 because MP4 offers better compatibility across devices and platforms.

Some users may find that their MP4 videos have no sound after converting MKV to MP4, especially with VLC media player.

Why No Sound When Converting MKV to MP4?

The causes vary for different situations. In general, the following reasons are the most common ones that will result in converting MKV to MP4 no sound.

  • No audio data in the original MKV video file.
  • Audio data loss/damage during conversion.
  • Audio data in the target MP4 file is unreadable.

Below are several possible causes and fixes for this issue.

How to Fix Converting MKV to MP4 No Sound?

  • Use a VLC alternative.
  • Adjust the VLC conversion settings.

If the converted MP4 has no sound, try using the VLC alternatives or adjusting the conversion settings in VLC.

#1 Use VLC Alternatives

One way to fix the “converting MKV to MP4 no sound” problem is to use an alternative to VLC media player. Below are two VLC alternatives you can try: MiniTool Video Converter and FFmpeg.

1. Use MiniTool Video Converter

MiniTool Video Converter is a professional and reliable video/audio converting program that can help convert your media files from one format to another with little effort.

“The free version is genuinely fast and clean. No registration, no mandatory account, no ads inside the interface. That’s increasingly rare.”crepal.ai

Here is how to use it to convert MKV to MP4 quickly:

Fast Track:

  1. Install and open MiniTool Video Converter.
  2. Import target MKV file.
  3. Set output format.
  4. Start the conversion.
  5. Locate the new file.

Step 1: Install and open MiniTool Video Converter.

Download and install MiniTool Video Converter on the Windows PC.

MiniTool Video ConverterClick to Download100%Clean & Safe

Step 2: Import target MKV file.

Launch the application, choose Add Files to import the MKV file.

MiniTool Video Converter Convert Video interface with the Add Files option selected.

Step 3: Set output format.

Click the gear icon to open the output format window. Then, go to the Video tab, choose MP4, and select the video quality.

MiniTool Video Converter Convert Video interface showing how to choose MP4 HD 1080p as output format.

Step 4: Start the conversion.

Click Convert to start conversion.

MiniTool Video Converter Convert Video interface with the Convert option selected.

Step 5: Locate the new file.

Once the conversion process is completed, click the folder icon to locate and view the MP4 file.

MiniTool Video Converter Convert Video interface with the folder icon selected under the Completed tab.

Besides MKV and MP4, MiniTool Video Converter also supports formats like MOV, VOB, AVI, FLV, WEBM, XVID, WMV, WMA, WAV, AAC, MP3, and. Try it to convert other videos and audio files with ease.

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2. Use FFmpeg

FFmpeg is a free and open-source software project that contains a set of programs and libraries for handling video, audio, as well as other multimedia files. The core of FFmpeg is the command-line ffmpeg tool, which is aimed at processing video and audio files. Thus, it focuses on format transcoding, video scaling, basic editing, video post-production effects, and standards compliance.

Besides, FFmpeg is part of the workflow of lots of other applications. Moreover, its libraries are a core part of many media players like VLC. Furthermore, FFmpeg includes encoders and decoders for many audio and video file formats. Therefore, it is widely used for the transcoding of common and uncommon media files.

Here, you can make use of the copy codec option of FFmpeg to transfer a long video in seconds without the long process of re-encoding by other software:

ffmpeg -i myvideo.mkv myvideo.mp4

Just a simple command without extra complicated options.

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#2 Adjust Conversion Settings

The second method I would like to introduce lies within the conversion process:

Fast Track:

  1. Open VLC and choose Convert/Save.
  2. Import the MKV file.
  3. Select an MP4 profile and open Profile edition.
  4. Choose MP4/MOV and keep the original video/audio tracks.

Step 1: Open VLC and choose Convert/Save.

Launch the VLC media player on your device. Then, click on Media in the top left menu and select Convert/Save in the dropdowns.

VLC media player interface with the Convert or Save option selected.

Step 2: Import the MKV file.

In the new window, click the Add button to add the target MKV file. Then, click the Convert/Save button in the lower right.

VLC media player Open Media window with the Add option and Convert or Save option pointed by an arrow.

Step 3: Select an MP4 profile and open Profile edition.

Next, select an MP4 profile in the Settings section. Click on the Edit selected profile option next to the selected MP4 profile.

VLC media player Convert window with the Edit selected profile option selected.

Step 4: Choose MP4/MOV and keep the original video/audio tracks.

In the pop-up Profile edition window, under the Encapsulation tab, choose MP4/MOV.

VLC media player Profile edition window with the MP4 or MOV file selected.

In the Video codec and Audio codec tab, check the Keep original video track option and the Keep original audio track option respectively.

VLC media player Profile edition window with the Keep original audio track option checked.

With these settings, it will only change the container of the video from MKV to MP4 without re-encoding anything. Such an operation will avoid audio data loss, damage, or compatibility issues. Therefore, it can prevent converting MKV to MP4 no sound.

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Other useful solutions to the “converting MKV to MP4 no sound” problem are:

  • Alter audio sample rate, bitrate, etc. while VLC processing.
  • Change strict standard compliance in VLC.
  • Update or reinstall VLC.
  • Disable all enhancements in the Control Panel.

In addition to that, MiniTool MovieMaker can also assist you in converting MKV to MP4 effortlessly. You just need to import the MKV file into this software, add the file to the timeline, and export it in MP4 format.

MiniTool MovieMakerClick to Download100%Clean & Safe

MiniTool MovieMaker Export window with the Format option selected.

That’s all about the possible fixes for the no sound when converting MKV to MP4 issue. If you have any questions while using MiniTool products, don’t hesitate to contact [email protected].

Converting MKV to MP4 No Sound FAQ

How do I confirm my exported MP4 actually contains an audio stream?
Load the result in VLC and open Tools > Codec Information. Then, scan the stream list for audio entries. If none are found, it means there is no sound during export. To resolve this, double-check the presets and ensure the audio streaming option is enabled before running the job again.
Does the sample rate or bitrate affect VLC audio output?
Yes. A mismatched or non-standard sample rate can cause a mute when playing the VLC media player. Therefore, during conversion, it is necessary to match the original sample rate and use the same bit rate to ensure proper synchronization of the video and audio streams.
How to avoid the “no audio” issue in VLC?
Before converting, click the wrench to open the Profile Editor, activate the sound track, and set the encoder to AAC or MP3. Match the source sample rate and disable strict compliance if necessary.
How to convert MP4 to audio with VLC?
1. Open VLC.
2. Select Media > Convert/Save.
3. Click the Add button and select the video file.
4. Click the arrow on the Convert/Save button and select Convert.
5. Select Audio - MP3 for the profile.

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About The Author

Mia

Position: Columnist

Mia joined MiniTool as an SEO editor following her university graduation, bringing a strong foundation in digital content optimization. She has since developed extensive expertise in creating technical articles and delivering practical solutions for video conversion, video compression, and audio transcription. She remains current with emerging software trends and continuously refines her content strategy based on real user feedback and industry developments.

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