slideshows:
https://github.com/gre/diaporama
https://github.com/h2non/videoshow
after effects like video effects
https://github.com/NatronGitHub/Natron
https://github.com/brianchirls/Seriously.js
video ai transition tool using pose estimation
https://github.com/jungdj/AI-Effects
https://github.com/IronSpiderMan/VideoSpecialEffects
video transitions:
https://github.com/advplyr/img2vid
https://github.com/ice45571/video-transition
https://github.com/povdocs/video-transitions
https://github.com/transitive-bullshit/ffmpeg-concat
https://github.com/transitive-bullshit/ffmpeg-gl-transition
shot detect key frame saving: