[tptacek]

You can just use ffmpeg to extract frames, and then just render the raw images with unicode blocks.

(There's Kitty Graphics too, but I couldn't figure out how to make terminal UI layout work with it.)

[mikkupikku]

I'd use ffmpeg to downscale the frames to the terminal size too. There are also various filters that could help quantizing the colors to what your terminal supports. The paletteuse filter will get you free dithering too.