For example, you cannot play 4K MKV files on Roku with its built-in USB port, or the video plays but there's no audio. Or you can play them back all you get is audio with a blank screen. "Trying to play a large 4k MKV file, 10bit, TrueHD, (about 30gb total) using an external SSD, plugged into the back of the Roku using USB3. This is a 2020 Roku
Step 3 Select the Corresponding Android Device. For this step, go to the drop-down list of Output Format: and click the Device. There you'll see a lot Android device name for your choice, just select the corresponding device you want to play the converted MKV file with. See the image attached.
Step 1. Click "Add Video" button to load source MKV files. You can load multiple MKV files or other Plex incompatible video files to convert at a time. Step 2. Go to "Profile" bar and choose MP4 (h264+aac) from Common Video category. Optionally choose preferred audio track, subtitle, output folder according your needs.
Step 3: Start conversion. After all necessary settings, you can hit the "Convert" to start converting MKV to Films & TV supported format. Once the conversion finished, click "Open" in main interface to quick locate the converted video. Then, you can play MKV files on Windows 10 Movies & TV app without hassle.Everything depends on your PC and the software you use to play the file. It is possible to use a TV as a client like this, but it is up to you, to make sure that the MKV files are compatible with your TV. Alternatively, you can install software on your NAS, and use your NAS as a DLNA-server instead of a file-server. .