: Windows File Explorer does not natively display embedded MKV thumbnails. You can use Icaros to enable thumbnail previews for MKV cover art.

Name the attachment cover.jpg or small_cover.jpg for best compatibility with players.

: If you prefer using terminal commands, you can attach an image without re-encoding the video: ffmpeg -i ThaiHauCheonChu_13.mkv -c copy -attach cover.jpg -metadata:s:t mimetype=image/jpeg ThaiHauCheonChu_13_with_cover.mkv How to View the Cover Art

To add or view a "piece covering" (cover art or thumbnail) for the video file , you can use specialized media tools to embed an image directly into the Matroska (MKV) container. How to Add Cover Art to an MKV File

: This is the industry-standard free tool for managing MKV files.

: High-quality players like VLC Media Player or MPV will typically recognize and display the embedded cover art during playback or in their library views. Security Warning

Click to save the new version of the file.