How do I make 1 bit animations?

what i do is use ffmpeg to export every frame of a video and then use imagemagick to process them all in whatever way (dithering to 1-bit in your case). i then put them back together as (avi) videos with ffmpeg. i don't know if ffmpeg is able to produce animated gifs, but it probably is. otherwise there must be some other gif tools, just use whatever gif tool and feed it the images you made.

the catch is that both ffmpeg and imagemagick are command-line tools. there are GUI frontends for both (sometimes i use the ffmpeg frontend "ffe" to convert youtube videos to mp3 - haha) but i imagine they both involve learning how to use ffmpeg and imagemagick command-line arguments anyway.

in terms of streamlined GUI solutions i imagine that adobe photoshop has a batch processor, but it is expensive and adobe. the GIMP, a free alternative to photoshop, does have a batch processor, but it involves using the command-line anyway (and seemingly also involves writing scripts in LISP - yikes). so i don't know what to suggest for free GUI options. maybe you'll just have to get stuck into the command-line.

(i don't mean to patronise by assuming you don't know how to use the command-line, maybe you do, maybe you don't - just trying to cater my reply to everyone who may be reading)

hope this helped.

imagemagick: imagemagick.org
ffmpeg: ffmpeg
the GIMP: gimp.org
adobe photoshop: adobe.com/photoshop