Hi,
My name is Angel. I am an Independent Advisor. Thank you for posting in Microsoft Community.
Windows 10 is constantly updated to provide patches and service packs for immediate fixes in Microsoft Windows and its programs. The updates are obligatory and routinely released to enhance features in multimedia as well as security to protect Windows systems from malicious attacks.
In case of multimedia segments, Windows 10 supports Digital Rights Management(DRM) – videos with various file formats like .mp4, .avi,.mov and others. All that is well, but some users have reported this peculiar problem of MKV video playing in the Movies & TV app without sound. Although the sound is working absolutely fine on the system, this issue is seen only for the file of MKV video formats. Also, its seen that there is a missing sound on the output interface. Moreover, the video plays well with other media player except for Movies & TV app.
In order to play any video on your computer, it is necessary that the system supports proper codecs to play the video. The main cause for this problem is that the DTS audio used in MKV files are not compatible with those used in Movies and TV app. In this article, are showed some solutions to resolve this issue.
https://www.thewindowsclub.com/no-sound-mkv-vid...
Hope the information provided is useful. If the issue persists, reply here and we will be glad to help you.
Angel.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.