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I took a detour to add a proof-of-concept feature to my #WordPress photo blog.

- on post save/update
- loop through blocks
- images: included
- videos: use ffmpeg to produce a video poster image
- use PHP GD lib to combine images into gridded collage
- additional "+#" count overlay
- save the result to the media library
- sets the attachment as the post's featured image & og:image tag

I'm going to take a few days to clean up the code and produce a small writeup.