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How to Fix MKV Videos with No Sound in OneDrive, SharePoint, or Stream
Question details
Users experience no audio output when previewing certain MKV video files directly in web browsers via Microsoft 365 services.
- Product
- OneDrive, SharePoint, Microsoft Stream
- Device & OS
- not provided
- Scenario
- Streaming or previewing MKV video files within a web browser using Microsoft's cloud storage or video services.
- Observed behavior
- The video plays visually in the browser preview but produces no sound, despite playing perfectly with audio when downloaded and played offline in Windows Media Player.
Ensure that your web browser tab is not muted and that your computer's system audio is functioning correctly before troubleshooting file encoding issues.
Convert the MKV Video to MP4 (H.264/AAC)
Re-encoding the video into a universally supported format like MP4 ensures full audio and video compatibility with Microsoft 365 web previews.
MKV is a container format that supports various audio codecs. If the specific audio codec used in your MKV file (such as AC3 or DTS) is not natively supported by your web browser, the video will play without sound in OneDrive or SharePoint.
Install a reliable video conversion tool such as Handbrake, or open a trusted online video converter.
Select or drag-and-drop the affected MKV file into the conversion software.
Set the output format to 'MP4'. Ensure the video codec is configured to 'H.264' and the audio codec is set to 'AAC'.
Start the conversion process and save the newly generated MP4 file to your local computer.
Delete the original MKV file from your OneDrive, SharePoint, or Stream folder, and upload the newly converted MP4 file to test the playback.
Test Playback in an Alternative Web Browser
Sometimes browser-specific limitations, extensions, or corrupted cache files can prevent audio from rendering correctly during a video preview.
Contact Your Microsoft 365 Administrator
If you have verified that the video format is correct but the issue persists across all browsers, backend troubleshooting may be required.
Choose WPS Office for Seamless Document Management
While resolving complex video playback issues requires format conversion, handling your daily documents should be straightforward. WPS Office provides a free, lightweight, and highly compatible alternative to Microsoft Office, letting you create, edit, and share Word, Excel, and PowerPoint files without compatibility headaches.
- 1. Visit the official website: Go to the official WPS Office website to access the latest version.
- 2. Download the software: Click the 'Free Download' button to download the installation package for your specific operating system.
- 3. Install and launch: Run the downloaded installer, follow the on-screen prompts, and start creating documents instantly.
Frequently Asked Questions
Why do some MKV files play with sound in OneDrive while others do not?
MKV is a container format that can package various types of video and audio codecs. If an MKV file uses an audio codec that your web browser or Microsoft's web player does not support (such as DTS or AC3), the video will stream without sound. MKV files with supported audio codecs (like AAC) will play normally.
Which video formats are officially recommended for SharePoint and Stream?
Microsoft recommends using widely supported formats like MP4, MOV, and WMV for the best playback experience. Specifically, MP4 files encoded with H.264 for video and AAC for audio guarantee the highest compatibility across all web browsers and operating systems.
Can I fix the OneDrive video sound issue without converting the file?
Yes. If you prefer not to re-encode the MKV video, you can download the file directly to your local computer. Once downloaded, use a robust offline media player like VLC or Windows Media Player, which have built-in support for a broader range of audio codecs.
Does this audio issue affect the original file stored in the cloud?
No, the original file remains completely intact and uncorrupted. The lack of audio is strictly a limitation of the browser-based preview player trying to decode the file on the fly, not an issue with the file data stored on Microsoft's servers.
