Convert video to GIF using FFmpeg

ffmpeg -y -i combined.mkv -vf fps=24,scale=1080:-1:flags=lanczos,palettegen palette.png
ffmpeg  -i combined.mkv -i palette.png -filter_complex "fps=24,scale=1080:-1:flags=lanczos[x];[x][1:v]paletteuse" out.gif 

• -y Overwrite output wihtout asking
• -i Specify input filename
• -vf Video filtergraph
• -filter_complex Creates a complex filtergraph with inputs and/or outputs

Explanation and other resources:

• How to make GIFS with FFMPEG (GIPHY Engineering)
• High quality GIF with FFmpeg
• “You can’t just code a gif”