Not optimal but fun. I made the same silly mistake recently thinking
GIFs would be cool. But you lose colour depth (GIFs are indexed 256
colour at most) so get dithered, and the GIF files were bigger than the
original MP4s. Not clever, but fun.

GIFs have two significant advantages though:
  1. A longer history of support across many web browsers (decades); and
  2. They are temporally lossless, which is good for detail (although spatially 
lossy in colour).

I'm still a little shocked that GIFs still exist in this century...

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https://bugs.launchpad.net/bugs/1527315

Title:
  Attached gif downloaded from telegram takes out the phone as
  thumbnailer hogs the memory and cpu

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