Roku Play Mkv

Many high-end MKV files use "lossless" audio like Dolby TrueHD or DTS-HD MA, which Roku does not support natively. These files will either have no sound or will require an external A/V receiver capable of decoding the passed-through audio signal. Method 1: Playing MKV via USB

Navigate to or Accessibility > Captions mode . Select On always to display the text. Alternative Playback Methods

If your Roku device (like the Roku Ultra or certain Roku TVs) has a USB port, you can play MKV files directly from a flash drive.

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If the Roku Media Player won't play your file or display subtitles, consider these options: Enable Subtitles(closed Captioning) on Roku TV