How to extract hardsub mkv?

To extract hardsub from an MKV file, you can use software like VLC Media Player or HandBrake. In VLC, play the video, go to Tools > Preferences > Video, and check the "Subtitles" option to display them, but note that this only allows you to view, not extract them permanently. For actual extraction, HandBrake can be used to re-encode the video, but it will burn the subtitles into the video, making them part of the image. If you want to create a separate subtitle file, you'll need to use OCR software after capturing frames of the video with the subtitles displayed.