MakeMKV is a one-click solution to convert video from DVD or Blu-ray discs into MKV, which is a free and patent-unencumbered format that can be played everywhere. MakeMKV is a format converter or "transcoder". The only thing it does is convert video clips from a (usually encrypted) disc into a set of MKV files, preserving most information but not changing it in any way. The MKV format can store multiple video and audio tracks with all meta-information and preserve chapters.
AstroAviBrowser is a small tool for astronomy imaging capture/processing. It allows you to open a video file, select the good frames, and save the new sequence in a new avi file using raw or lossless codecs. You may also de-bayer your frames and separate RGB plans. It's a kind of "AviRaw" for Linux.