Highest-quality GIF encoder based on pngquant.
gifski converts video frames to GIF animations using pngquant's fancy features for efficient cross-frame palettes and temporal dithering. It produces animated GIFs that use thousands of colors per frame.
It's a CLI tool, but it can also be compiled as library for seamelss use in other apps (note that for closed-source apps you need a commercial pngquant licence).
Download and install
See releases page for executables.
Usage
I haven't finished implementing proper video import yet, so for now you need ffmpeg to convert video to PNG frames first:
and then make the GIF from the frames:
See gifski -h for more options.