If you’re trying to play an MKV video encoded with HEVC (also known as H.265) on Linux Mint and get a “codec missing” error or no video/audio, here’s the quick fix.
This package provides the HEVC decoder and encoder libraries. install hevc codec for mkv video on linux mint link
sudo apt install ubuntu-restricted-extras If you’re trying to play an MKV video
ffmpeg -decoders | grep 265