Lossless Cut is a free program that trims videos with no loss of quality (it does not reencode them).

Example Lossless use cases

• Cut unwanted intro or outro sections from a Zoom or Kaltura video.
• Remove audio tracks from a file
• Extract music track from a video and cut it to your needs
• Add music to a video (or replace existing audio track)
• Combine audio and video tracks from separate recordings
• Include an external subtitle into a video
• Quickly change a H264/H265 MKV video to MOV or MP4
• Quickly cut a file by its MP4/MKV chapters
• Quickly cut a YouTube video by its chapters (or music times from a comment)
• Attach cover art to videos
• Change author, title, GPS position, recording time of a video
• Fix rotation of a video that has the wrong orientation flag set
  • Great for rotating phone videos that come out the wrong way without actually re-encoding the video.
• Loop a video / audio clip X times quickly without re-encoding
• Convert a video or parts of it into X image files (not lossless)