Keep in mind that not all Roku devices support MKV files, and some apps may have limitations or requirements for playing MKV files.
Roku devices natively support playing files, but success depends entirely on the specific video and audio codecs inside that MKV "container". While the MKV format itself is compatible, your Roku may fail to play it or play it without sound if the internal encoding doesn't match Roku’s official specifications. Supported Codecs for MKV Playback 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 Keep in mind that not all Roku devices
Navigate to or Accessibility > Captions mode . Select On always to display the text. Alternative Playback Methods Supported Codecs for MKV Playback Many high-end MKV