Based on your request, it seems you are working with a video file titled and looking to "create a piece" (likely to trim, edit, convert, or extract a portion).

Here are the most common ways to handle an .mkv video file, typically using tools that handle high-quality straight rips without re-encoding (like MakeMKV ), or editing software:

Alternatively, use a video editor like to set a starting point ("A") and ending point ("B") and save the selection. 2. Transcode/Convert for Better Compatibility

path and settings (choose "Keep original" or "Passthrough" for video/audio to avoid quality loss). Click "Start" to create the new, smaller piece.

If you need only the audio or specific subtitle tracks, MKVToolNix is the industry standard for demuxing (separating) the tracks from the .mkv container. Open your software (MKVToolNix or HandBrake).