MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows.
https://mkvtoolnix.download/index.html


MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows.
https://mkvtoolnix.download/index.html
MediaInfo is a convenient unified display of the most relevant technical and tag data for video and audio files.
https://mediaarea.net/en/MediaInfo
HandBrake is an open-source video transcoder available for Linux, Mac, and Windows. Everyone can use HandBrake to make videos for free.
HandBrake takes videos you already have and makes new ones that work on your mobile phone, tablet, TV media player, game console, computer, or web browser—nearly anything that supports modern video formats.
HandBrake works with most common video files and formats, including ones created by consumer and professional video cameras, mobile devices such as phones and tablets, game and computer screen recordings, and DVD and Blu-ray discs. HandBrake leverages tools such as FFmpeg libavcodec and libavformat libraries, x264, x265, and svt-av1 to create new MP4, MKV, or WebM video files from these
https://handbrake.fr/docs/en/latest/introduction/about.htmlSources
.
XMedia Recode is a free All-In-One audio converter, video converter and video editor.
XMedia Recode supports hardware accelerated video conversion from AMD, Nvidia and Intel.
XMedia Recode can convert almost all known audio and video formats, including AAC, AC3,Blu-ray, DVD, FLAC, H.264, H.265, Matroska (MKV), MP4, WebM, WMA and WMV.
XMedia Recode can only convert unprotected Blu-rays/DVDs.
https://www.xmedia-recode.de/en/
Furthermore, it supports online database lookups from, e.g., Discogs, MusicBrainz or freedb, allowing you to automatically gather proper tags and download cover art for your music library.
You can rename files based on the tag information, replace characters or words in tags and filenames, import/export tag information, create playlists and more.
https://www.mp3tag.de