After trying multiple PCs/Phones, it turned out that the file hadn't been properly encoded.

I have received video files in the past where the video would disappear in certain parts and the audio would keep playing. If they play all other files fine and won't play this one, then there is a chance that the video file might be corrupt. It's not necessary that the issue is with your PC and phone.

There is, of course, a chance that the file itself is corrupt. This will help you avoid files with this specific codec, in case your phone/PC are not able to play it. Even VLC should be able to show it on your PC (not sure about phone). There are many ways to see this information. Going from there, you'll need to check the actual codec used to encode the video. so mkv doesn't really represent a single format. The codec information is available as metadata in the video file and the file extension is just to help identify it as a video file. Not all of those have distinct file extensions. There are many different video codecs and compression algorithms. Or, if you are having issues with your install, you can get help in our forums here.Some additional information regarding the question, mkv isn't really a format, it's just a container. We have been covering all of the new features that shipped with the latest build of Windows 10, 9860. If you happen to find something that we have not covered yet, make sure to send us a tip. This means that Windows 10 does have support for MKV, even if it is early in the implementation, for the file type. We tested this in Windows 8.1 and when you try to play the file in that OS, Windows Media Player will not play the content if you try to bypass the warning. After you select WMP, a warning will pop up saying that the player does not support this file but if you click 'Yes', the file will then play. After the file downloads, when you open it up, Windows will ask you what app you want to use to open this type of file with select Windows Media Player. If you want to test out support for MKV on your install, you can download a sample video from Jellyfish. For those who do not know, MKV files are a popular format for movies and the addition of this support will likely appease many Windows users. One item that is new in Windows 10 that was not present in Windows 8.1 is support for MKV files out of the box. Since its release, we have been digging through the new OS and finding all kinds of new features that were not announced when the build was released. Microsoft has released Windows 10 build 9860 and if you haven't downloaded it yet, here is how you can do so.

Forums windows media player mkv codec