QuickTime Pro 7

essential features

• ability to mark in (I), mark out (O) on a video and trim to selection
• ability to add audio to a video file
  • 1) open video .mov
  • 2) open audio .aiff
    • 3) select all (command-A) on audio .aiff
    • 4) copy (command-C)
  • 5) go back to video .mov)
  • 6) add to movie -- audio is added to video .mov

discussion

• https://forums.macrumors.com/threads/quick-time-7-pro-replacement-in-macos-big-sur.2283858/

alternatives

• https://github.com/mifi/lossless-cut
  • issue: DNxHD36 video appears black
• https://www.shutterencoder.com/en/
  • doesn't appear to have a player interface for playing back the file