framestep=n renders only every nth frame.hqdn3d=luma_spatial:chroma_spatial:luma_tmp:chroma_tmp temporal denoiser.cropdetect=threshold finds black bars or still background and tells you parameters for the crop filter.Some useful filters in this context, add them with -vf-add order of operations matters! Mplayer has huge amounts of filters, but you only really need -vo png mplayer foo.mp4 -ao null -ss 189.8 -endpos 2.2 -vo png:z=5.Likewise, gifsicle can resize and reduce colormaps but generally does a poor job of it, so we have to use imagemagick. Mplayer has a -vo gif89a mode to quickly generate an animated gif, but it’s usually of poor quality and large file size. sudo apt-get install mplayer imagemagick gifsicle giftrans.To install the necessary software on ubuntu or any debian-based linux: This is pretty much how I make gifs, except I use mplayer instead of ffmpeg and typically generate a custom colormap instead of ordered dither since dithering of any kind usually looks like crap. Kxz from room208 wrote an excellent tutorial on making gifs from the command line.

Ffmpeg gif no dithering